JP2002312760A - Water temperature drawing preparation method and system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To timely prepare a highly accurate water temperature drawing without the missing zone of a cloud zone regarding the preparation of the water temperature drawing, to enable flexible utilization by a personal computer or the like in a ship regarding the utilization of the water temperature drawing and to enable the flexible utilization by the personal computer or the like in the ship together with the water temperature drawing regarding the utilization of the data of a wave height, a wind velocity and a wind direction. SOLUTION: Regarding the preparation of the water temperature drawing, by identifying the cloud zone from satellite image data, eliminating the pixel value of the cloud zone and interpolating the water temperature value by using the water temperature value of the periphery, the highly accurate water temperature drawing without the missing zone is prepared timely. Regarding the utilization of the water temperature drawing, the water temperature drawing is worked into a form utilizable by the personal computer or the like and transmitted to the personal computer or the like. Regarding the utilization of the data of the wave height, the wind velocity and the wind direction, wave/wind information received from the Meteorological Agency is worked and transmitted to the personal computer or the like together with the water temperature drawing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention (1) automatically creates a water temperature map of the sea surface without any loss due to a cloud area and its surrounding noise area using satellite image data obtained from an artificial satellite. A method and system for automatically creating a water temperature chart, which is characterized in that: (2) the water temperature chart obtained by the above method or system is processed into a form usable by information equipment such as a personal computer installed on the ship, A method and a system that enable the water temperature distribution data to be used flexibly and effectively, and (3) a navigation route predicted based on weather forecasts and navigation speeds, together with water temperature chart data obtained by the method or the system. Wave height, wind direction, and wind speed data are processed into a format that can be used by information equipment such as a personal computer installed on the ship. Data relating to a method and system that enables flexible effectively utilized.

[0002]

2. Description of the Related Art Water temperature charts showing the water temperature distribution on the sea surface are generally recognized to be useful in the fields of weather and fisheries,
It is used for route determination and fishing ground determination. For a ship, the wave height, wind speed, and wind direction of the route to the destination are very important factors in ensuring the safety of navigation, and the wave height, wind speed, and wind direction of the destination at the time of reaching the destination. Is also an important factor in determining fishing abundance in addition to navigation safety, and information on waves and winds is used in determining navigation routes and fishing grounds along with water temperature charts.

Conventionally, when preparing a water temperature chart, government agencies request observations from thousands of ships and collect data over several days. However, since this water temperature chart creation method is based on information for several days, especially where there is little ship data in offshore waters, empirical predictions by humans from past data, so-called intuition, are included. Therefore, the accuracy of the water temperature data becomes low.

Conventionally, satellite data such as NO
A method of creating a water temperature chart using data from AA / AVHRR is also performed. However, satellite data often contains a lot of cloud areas in the image,
It is known that since satellite data is infrared data, not only can water temperature information beneath a cloud area not be obtained, but data around the cloud can be noisy.

[0005] As a method of eliminating such a missing area or a noise area due to a cloud area, conventionally, the movement of the cloud area is faster than a change in water temperature and often moves daily. A method has been used to make the cloud area as small as possible.

When a water temperature chart is created from satellite data by such a method, a composite image is generated by calculating and calculating a representative value of each pixel from a plurality of satellite data within a predetermined period to obtain a water temperature chart. ing. It has been empirically known that when creating a composite image, the cloud area does not disappear unless satellite data of about 15 days is combined in many cases. If satellite data for about two weeks is synthesized to remove the cloud area, there is a problem that the advantages of satellite data, namely, synchronization and immediacy, are lost.

In order to solve such a problem, conventionally,
It is a method that humans judge the cloud area and the noise area, determine the pixel value by various methods and perform cloud identification,
Since human processing is involved, discrimination of regions by clouds and noise is not objective, and the human image processing experience, oceanography,
There was a problem that the accuracy of the data varied due to the knowledge of meteorology.

The water temperature chart obtained by the above means is generally transmitted to the ship by a method such as facsimile transmission from a government office or the like. However, in this water temperature chart data distribution method, since the output medium is paper, it is not possible to use, for example, referring to detailed data in a specific area from data received by a ship.

That is, when a water temperature chart is used in a ship, generally, for example, with regard to the sea area, first, after looking at a wide area water temperature chart such as the Sea of Okhotsk and the sea off Sanriku, the object is further narrowed, For example, 40 degrees north to 4 degrees north
It is desirable that a usage method such as viewing a more detailed water temperature chart of the sea area limited to the sea area of 4 degrees and 148 degrees to 152 degrees east longitude is possible. For example, regarding the accuracy of the water temperature, a method of using a water temperature chart in units of 2 ° C. for a wide area of the sea, and then a more accurate water temperature chart in units of 1 ° C. for a specific sea area narrower than that. Is desirable.

However, in the current facsimile transmission method, if such a method is used, the facsimile transmission must be repeated several times. Since the medium is paper, there is a problem that it is difficult to flexibly use the data as compared with data in a format that can be used in an information device such as a personal computer.

Water temperature charts are sometimes converted into data and transmitted to ships using wireless communication means. However, it is not possible to mount a very large antenna on ships due to restrictions on cost and installation space. Because the direction of the antenna installed on the ship constantly fluctuates due to the influence of the above, the connection state of the communication is extremely unstable. Therefore, the data communication speed with the ship is much lower than the speed generally provided for ground communication, and the communication is often disconnected.
In particular, image data such as a map has a large capacity, requires a high communication speed, and requires a long time to complete transmission.
Under these circumstances, it is difficult at present to make effective use of the created water temperature chart by ships.

Further, the wave height, wind speed and wind direction of the navigation route and the destination are important factors which influence the fishing abundance as well as the seawater temperature, and the wave height, wind speed and wind direction of the passing point at each passage point of the navigation route are determined. It is desired that the prediction data can be used together with the water temperature chart data. However, the wave height, wind speed, and wind direction change every moment under the influence of weather changes, as well as the seawater temperature.Forecast data on the wave height, wind speed, and wind direction at the passage date and time of each point on the route are included together with seawater temperature data. No available means are currently provided. Also, even if prediction data on the wave height, wind speed and wind direction at the passage date and time of each point on the route is provided to the ship together with the seawater temperature data, the method using paper as the output medium can be used with information equipment such as a personal computer. It is difficult to flexibly use the data as compared with data in a simple format, and it is difficult to transmit wave / wind data in a format that can be used by an information device such as a personal computer or the like for water temperature chart data.

[0013] That is, the problems are (1) that the water temperature chart cannot be obtained in a timely manner and the accuracy of the seawater temperature in the offshore water area is low with respect to the preparation of the water temperature chart. (3) The use of wave height, wind speed and wind direction data is not possible because of the lack of flexible means that can be used with water temperature charts. is there.

[0014]

SUMMARY OF THE INVENTION The present invention is to solve the above problems.

First, in a daily satellite image data, a pixel in a cloud region or a noise region due to the cloud region is automatically identified, and the pixel value of the pixel is automatically set to a value that cannot be attained by the water temperature.
It is an object of the present invention to provide a method and a system for automatically performing an interpolation process on the pixel and creating an effective water temperature chart with a small error due to a cloud area or the like.

Further, the water temperature chart data created by the above water temperature chart creation method and system is processed into a format usable by information equipment such as a personal computer installed on the ship, so that the water temperature chart data can be flexibly used on the ship. It is intended to provide a method and a system that can be used.

Further, together with the water temperature chart data created by the water temperature chart creation method and system, the wave height, wind direction, and wave height in the navigation route predicted based on weather forecast and navigation speed.
A method of processing wind speed data into a format that can be used by information equipment such as a personal computer installed on the ship, and enabling the ship to flexibly and effectively use wave and wind data together with a water temperature chart; and It aims to provide a system.

[0018]

According to a first aspect of the present invention, there is provided a water temperature chart creation method for creating a water temperature chart from satellite image data obtained from an artificial satellite, wherein all pixels in a predetermined area of the satellite image data to be processed are provided. A cloud area identification step of generating a cloud area identification image by comparing a value with a predetermined threshold and identifying an area having a value lower than the predetermined threshold as a cloud area; and a pixel value of the identified cloud area. Is set to a value that cannot be considered as the water temperature, the pixel value of the clear region is distinguished from the pixel value of the cloud region, and a cloud region removing step of creating a cloud region removed image by removing the cloud region; And a cloud area pixel value interpolation step of generating an interpolated image by interpolating the pixel values of the pixels in the cloud area by calculation using the pixel values of the cloud area.

According to the present invention, the cloud area included in the satellite image data is automatically identified and removed, and the removed pixel value is interpolated by using the pixel values around the cloud area, so that there is no missing area. It is possible to create a high water temperature chart.

According to a second aspect of the present invention, there is provided a water temperature chart creating method for creating a water temperature chart from satellite image data obtained from an artificial satellite, wherein a plurality of satellite image data obtained during a predetermined period are used to obtain a pixel value of the same pixel. A reference image setting step of creating composite image data by maximum value synthesis in which the maximum value is set as the pixel value of the same pixel, and comparing all pixel values in a predetermined area of the satellite image data to be processed with a predetermined threshold value By identifying a region having a value lower than the predetermined threshold as a cloud region, a cloud region identification step of generating a cloud region identification image, and setting the pixel value of the identified cloud region to a value that cannot be a water temperature. In a cloud area removing step of creating a cloud area removed image by distinguishing a pixel value of a clear area and a pixel value of a cloud area and removing a cloud area, an area smaller by a predetermined width inside the cloud area, Previous Ported pixel value of the same pixel of the reference image, using the pixel value of the pixel value of the implanted region and the sunny region,
Interpolation is performed while calculating the pixel values of the pixels in the cloud area excluding the transplanted area, and then a series of processing in the processing is performed on the area smaller than the area interpolated by the processing by a predetermined width. A water temperature chart creation method characterized by comprising a cloud area pixel value interpolation step of inwardly proceeding to the center of the cloud area while gradually reducing the area and interpolating the entire cloud area.

In the present invention, since the pixel value of the reference image is used in the interpolation processing of the missing area, even when the missing area is wide, compared to the method using only the pixel value of the peripheral area of the missing area. Highly accurate interpolation processing can be performed.

According to a third aspect of the present invention, in the water temperature chart creating method for creating a water temperature chart from satellite image data obtained from an artificial satellite, in the first process, a plurality of satellite image data obtained during a predetermined period are provided. From the maximum pixel value of the same pixel as the pixel value of the same pixel to create composite image data, and use the composite image data as a reference image, and in the second and subsequent processing, Alternatively, a reference image setting step in which the interpolation image created in the previous process is used as a reference image, all pixel values in a predetermined area of the satellite image data to be processed, and a predetermined threshold are compared, and a value lower than the predetermined threshold is compared. A cloud area identifying step of generating a cloud area identification image by identifying an area having a value as a cloud area, and setting the pixel value of the identified cloud area to a value that cannot be considered as a water temperature. In a cloud area removing step of creating a cloud area removed image by distinguishing a pixel value of a clear area and a pixel value of a cloud area and removing a cloud area, an area smaller by a predetermined width inside the cloud area, By transplanting the pixel value of the same pixel of the reference image, using the pixel value of the transplanted area and the pixel value of the fine area,
Interpolation is performed while calculating the pixel values of the pixels in the cloud area excluding the transplanted area, and then a series of processing in the processing is performed on the area smaller than the area interpolated by the processing by a predetermined width. A water temperature chart creation method characterized by comprising a cloud area pixel value interpolation step of inwardly proceeding to the center of the cloud area while gradually reducing the area and interpolating the entire cloud area.

In the present invention, in the second and subsequent processes after the implementation of the method, the interpolation image created in the immediately preceding or previous process is used as the reference image as the reference image, so that the accuracy of the data of the reference image is higher. In addition, since the pixel value of the reference image is used in the missing area interpolation processing, even when the missing area is wide, interpolation with higher accuracy than the method using only the pixel value in the peripheral area of the missing area is performed. Processing becomes possible.

According to a fourth aspect of the present invention, in the water temperature chart creating method according to the first aspect, the cloud area pixel value interpolation step includes a step of interpolating a predetermined value among pixel values in a fine area within a predetermined range around the interpolation target pixel. Alternatively, a pixel value exceeding a predetermined calculated value is excluded from processing targets, and a cloud region pixel value interpolation that generates an interpolation image by interpolating a cloud region pixel value by calculation using the remaining fine region pixel values. This is a method for creating a water temperature diagram, which is a step.

For example, a pixel value exceeding a certain standard deviation value may include an error. Therefore, according to the present invention, interpolation can be performed with higher precision by processing the pixel value by excluding the pixel value. .

According to a fifth aspect of the present invention, in the water temperature chart creation method of the second and third aspects, the step of interpolating the cloud area pixel value includes the step of calculating the pixel values of the clear area and the transplant area within a predetermined range around the interpolation target pixel. Of these, pixel values exceeding a predetermined value or a predetermined calculated value are excluded from the processing target, and pixel values of the cloud area excluding the transplanted area using the remaining transplant area pixel values and clear area pixel values. Interpolation while calculating the pixel value of, then, for a region smaller by a predetermined width inside the region interpolated by the above process, a series of processes in the above process, the region is sequentially reduced toward the inside of the region This is a water temperature chart creation method, which is a cloud area pixel value interpolation step in which processing is advanced to the center of the cloud area while interpolating, and the entire cloud area is interpolated.

For example, a pixel value exceeding a certain standard deviation value may include an error. Therefore, in the present invention, interpolation with higher accuracy can be performed by performing processing with the pixel value excluded. .

According to a sixth aspect of the present invention, in the water temperature chart creating method according to any one of the first to fifth aspects, the calculation method for complementing the pixel value in the cloud area is a method of calculating the temperature of each pixel to be processed within a predetermined range around the interpolation target pixel. A water temperature chart creation step, which is a cloud area pixel value interpolation step which is a calculation method of calculating an interpolation target pixel value by weighted averaging a pixel value by using a distance between each pixel and the interpolation target pixel as a weighting element. Is the way.

It is known that the water temperature of the interpolation target area has a correlation depending on the water temperature of the surrounding area and the distance, and that the water temperature of the short distance area has a greater correlation than the water temperature of the long distance area. Therefore, in the present invention, high-precision interpolation becomes possible by performing weighted averaging using the distance to the pixel to be interpolated as a weight.

According to a seventh aspect of the present invention, in the method for creating a water temperature chart according to any one of the first to sixth aspects, the pixel value of a pixel included in a predetermined range around a pixel of the reference image at the same position as the interpolation target pixel is set as the predetermined threshold. A cloud area identification step using a minimum value among the above.

It is empirically known that the moving speed of the water mass is 30 to 40 km / day. Therefore, a value lower than the minimum pixel value of the pixel within a wider range is the cloud area. Since the possibility is high, in the present invention, the cloud area can be automatically identified with high accuracy by using the minimum value as the threshold value.

According to an eighth aspect of the present invention, in the water temperature chart creating method according to any one of the first to seventh aspects, the series of steps are repeated daily to generate a daily water temperature chart and output the daily water temperature chart. This is a method for creating a water temperature chart.

According to the present invention, it is possible to output a daily water temperature chart by repeating each step every day, and to create a water temperature chart in a timely manner.

According to a ninth aspect of the present invention, there is provided a water temperature chart creating system for creating a water temperature chart from satellite image data obtained from an artificial satellite, wherein all pixel values in a predetermined area of the satellite image data to be processed are determined by a predetermined threshold value. By comparing a region having a value lower than the predetermined threshold as a cloud region, a cloud region identification unit that generates a cloud region identification image, and changing the pixel value of the identified cloud region to a value that cannot be a water temperature. Cloud area removing means for setting a clear area pixel value and a cloud area pixel value to create a cloud area removed image by removing the cloud area, and using the pixel value of the clear area pixel. And a cloud area pixel value interpolating means for generating an interpolated image by interpolating the pixel values of the pixels in the cloud area by calculation.

According to the present invention, the cloud area included in the satellite image data is automatically identified and removed, and the removed pixel value is interpolated by using the pixel values around the cloud area, so that there is no missing area. It is possible to create a high water temperature chart.

According to a tenth aspect of the present invention, in a water temperature chart creating system for creating a water temperature chart from satellite image data obtained from an artificial satellite, a plurality of satellite image data obtained in a predetermined period are used to obtain a pixel value of the same pixel. Reference image setting means for creating composite image data by maximum value synthesis for setting the maximum value as the pixel value of the same pixel, and comparing all pixel values in a predetermined region of the satellite image data to be processed with a predetermined threshold value By identifying an area having a value lower than the predetermined threshold as a cloud area, a cloud area identification unit that generates a cloud area identification image, and setting the pixel value of the identified cloud area to a value that cannot be a water temperature. A cloud area removing unit that distinguishes between a pixel value of a clear area and a pixel value of a cloud area and creates a cloud area removed image by removing the cloud area, and an area smaller by a predetermined width inside the cloud area, See above Ported pixel value of the same pixel of the image,
Using the pixel value of the transplant area and the pixel value of the clear area, interpolation is performed while calculating the pixel value of the pixel of the cloud area excluding the transplanted area, and then a predetermined width inside the area interpolated by the above processing A cloud area pixel value interpolating means for performing a series of processing in the above-described processing for an area that is only a small area toward the center of the cloud area while gradually reducing the area toward the inside of the area, and interpolating the entire cloud area. A water temperature chart creation system characterized by the following.

In the present invention, since the pixel value of the reference image is used in the interpolation processing of the missing area, even when the missing area is wide, compared with the method using only the pixel value of the peripheral area of the missing area. Highly accurate interpolation processing can be performed.

According to an eleventh aspect of the present invention, in the water temperature chart creating system for creating a water temperature chart from satellite image data obtained from an artificial satellite, in the first processing, a plurality of satellite image data obtained during a predetermined period are provided. From the maximum pixel value of the same pixel as the pixel value of the same pixel to create a composite image data by the maximum value synthesis, the composite image data as a reference image, in the second and subsequent processing,
A reference image setting unit that uses the interpolation image created in the immediately preceding or previous process as a reference image, compares all pixel values in a predetermined area of the satellite image data to be processed with a predetermined threshold, and compares the predetermined threshold. By identifying a region having a low value as a cloud region, a cloud region identification means for generating a cloud region identification image, and setting the pixel value of the identified cloud region to a value that cannot be a water temperature, and setting a pixel value of a clear region And a cloud area removing means for creating a cloud area-removed image by removing the cloud area from the pixel value of the cloud area, and an identical pixel of the reference image in an area smaller by a predetermined width inside the cloud area. By interpolating the pixel values of the above, using the pixel values of the transplanted area and the pixel values of the clear area, calculating the pixel values of the pixels in the cloud area excluding the transplanted area,
Next, for a region smaller by a predetermined width inside the region interpolated by the above-described process, a series of processes in the above-described process is performed to the center of the cloud area while gradually reducing the size of the region toward the inside of the region. And a cloud area pixel value interpolating means for interpolating the entire cloud area.

In the present invention, in the second and subsequent processes after the implementation of the method, the interpolation image created in the immediately preceding or previous process is used as the reference image as the reference image, so that the accuracy of the data of the reference image is higher. In addition, since the pixel value of the reference image is used in the interpolation processing of the missing area, even when the missing area is wide, interpolation with higher accuracy than a system using only the pixel value of the peripheral area of the missing area is performed. Processing becomes possible.

According to a twelfth aspect of the present invention, in the water temperature chart creating system according to the ninth aspect, the cloud area pixel value interpolating means includes a predetermined value among pixel values in a fine area within a predetermined range around the interpolation target pixel. Alternatively, a pixel value exceeding a predetermined calculated value is excluded from processing targets, and a cloud region pixel value interpolation that generates an interpolation image by interpolating a cloud region pixel value by calculation using the remaining fine region pixel values. It is a water temperature chart creation system characterized by being a means.

For example, a pixel value exceeding a certain standard deviation value may include an error. Therefore, according to the present invention, interpolation with higher accuracy can be performed by performing processing excluding the pixel value. .

The invention of claim 13 is the invention of claims 10 and 11
In the water temperature chart creation system, the cloud area pixel value interpolating means includes a pixel value exceeding a predetermined value or a predetermined calculated value among the pixel values of the clear area and the transplant area within a predetermined range around the interpolation target pixel. Is excluded from the processing target, and using the pixel values of the remaining transplant area and the pixel values of the clear area, interpolation is performed while calculating the pixel value of the pixel of the cloud area excluding the transplanted area, and then the interpolation is performed by the above processing. A series of processes in the above-described process is performed on an area smaller by a predetermined width inside the set area toward the center of the cloud area while gradually reducing the area toward the inside of the area, thereby forming a cloud area. A water temperature chart creation system characterized by cloud area pixel value interpolation means for interpolating all.

For example, a pixel value exceeding a certain standard deviation value may include an error. Therefore, according to the present invention, interpolation with higher accuracy can be performed by performing processing excluding the pixel value. .

The invention of claim 14 is the invention of claims 9 to 13
In the water temperature chart creation system, the calculation system that complements the pixel value of the cloud area calculates the pixel value of each pixel to be processed in a predetermined range around the pixel to be interpolated, and calculates the distance between each pixel and the pixel to be interpolated. This is a water temperature chart creation system, which is a cloud area pixel value interpolation means which is a calculation system for obtaining an interpolation target pixel value by performing weighted averaging as a weight element.

It is known that the water temperature of the interpolation target area has a correlation depending on the water temperature of the surrounding area and the distance, and that the water temperature of the short distance area has a greater correlation than the water temperature of the long distance area. Therefore, in the present invention, high-precision interpolation becomes possible by performing weighted averaging using the distance to the pixel to be interpolated as a weight.

The fifteenth aspect of the present invention relates to the ninth to fourteenth aspects.
In the water temperature chart creation system, the cloud area identifying means uses a minimum value of pixel values of pixels included in a predetermined range around pixels of the reference image at the same position as the interpolation target pixel as the predetermined threshold value. This is a characteristic water temperature chart creation system.

The moving speed of the body of water is 30 to 40 k per day.
m is empirically known, so a value lower than the minimum pixel value of a pixel within a wider range is more likely to be a cloud area. By using the value as the threshold, the cloud area can be automatically identified with high accuracy.

The invention of claim 16 is the invention of claims 9 to 15
In the water temperature chart creation system, a series of means is repeated daily to generate a daily water temperature chart and output a daily water temperature chart.

According to the present invention, a daily water temperature chart is output by repeating each means every day, and a water temperature chart can be created in a timely manner.

The invention of claim 17 is the invention of claims 9 to 16
In the water temperature chart creation system described in the above, from the client system, receiving means for receiving information of the display target area of the water temperature chart, and a water temperature chart screen creation means for creating a water temperature chart screen of the display target area specified by the client system Transmitting means for transmitting the created water temperature chart to the client system.

In the present invention, the water temperature charts prepared according to the ninth to sixteenth aspects are processed into a format usable by a client system such as a personal computer on a ship, and the water temperature chart is prepared in response to a request from the client system. Create and send a water temperature chart screen for a certain area. At this time, by creating a water temperature chart screen in consideration of the fact that transmission can be completed within an appropriate time even at a low data communication speed with the ship, the water temperature chart of the desired area on the ship can be used effectively and flexibly. Becomes possible.

According to a eighteenth aspect of the present invention, in the water temperature chart creating system according to the seventeenth aspect, a minimum water temperature value and / or a maximum water temperature value and / or a water temperature width and / or a water temperature division in the display of the water temperature diagram are transmitted from the client system. Receiving means for receiving the number information, and a water temperature chart screen according to the minimum water temperature value and / or the maximum water temperature value and / or the water temperature width and / or the water temperature division number designated by the client system or preset in the client system. A water temperature chart creation system comprising: a water temperature chart screen creation unit to be created; and a transmission unit that sends a created image to a client system.

According to the present invention, a water temperature chart screen can be created and transmitted with a desired water temperature width and accuracy (number of water temperature divisions) according to a request from the client system. As a result, for example, it is possible to use a water temperature chart in units of 2 ° C. for a wide sea area first, and then a more accurate water temperature chart in units of 1 ° C. for a specific narrower sea area. The water temperature chart can be used effectively and flexibly.

The invention of claim 19 is the invention of claims 17 and 18
In the water temperature chart creation system described in (1), the water temperature chart screen creation means expresses the water temperature for each pixel using color and / or shading.

According to the present invention, since the water temperature of the water temperature chart is expressed using colors and shades in the client system,
It is possible to visually grasp the water temperature distribution. In addition,
A well-known means may be used to express the water temperature using colors and shades.

The twentieth aspect of the present invention provides the seventeenth and eighteenth aspects.
In the water temperature chart creation system described in (1), the water temperature chart screen creation means expresses the water temperature using an isothermal line. In order to express the water temperature using an isotherm, a known means may be used.

According to the present invention, the water temperature in the water temperature chart is expressed using the isotherm in the client system, so that the water temperature distribution can be visually grasped.

The twenty-first aspect of the present invention provides the seventeenth to second aspects.
In the water temperature chart creation system described in Item No. 0, waves and / or
Or a wave / wind information receiving means for receiving wind information; a route information receiving means for receiving information of a departure place, a destination and zero or one or more passing points from a client system; and a departure place, a destination and zero. Or, a route selecting means for calculating a shortest route between one or more passing points, a wave / wind forecast information receiving means for receiving wave / wind forecast information from the Meteorological Agency computer system, and recording the received wave / wind forecast information. Using the wave / wind forecast information recording means and the recorded wave / wind forecast information,
In addition to the wave / wind information prediction means for obtaining prediction information of the wave height and / or wind speed and / or wind direction at the destination and zero or one or more passing point arrival times, the water temperature map screen created by the water temperature map screen creation means Transmitting means for transmitting prediction information of a wave height and / or a wind speed and / or a wind direction at a destination and zero or at least one passing point arrival date and time to a client system. .

According to the present invention, a user on a ship can determine a destination and a passing point while looking at the water temperature chart, and can know the prediction information of the wave height, wind speed and wind direction at the arrival time of the destination and the passing point. Therefore, it is possible to select a navigation route that can reach a fishing ground where abundant fishing can be expected in the shortest time while considering the safety of navigation.

According to a twenty-second aspect of the present invention, in the water temperature chart creating system according to the twenty-first aspect, there is provided a wave / wind information receiving means for receiving predetermined wave height and / or wind speed and / or wind direction information from a client system. , The route selection means,
When calculating the shortest route between the point of departure, the destination and zero or more passing points, the route is calculated avoiding points that do not satisfy the specified wave height and / or wind speed and / or direction. This is a water temperature chart creation system, which is a route selection means.

According to the present invention, the user on the ship can determine the destination and the passing point while looking at the water temperature chart, and can know the prediction information of the wave height, the wind speed and the wind direction at the arrival time of the destination and the passing point. Instead, the shortest route that avoids points that do not satisfy the conditions of the predetermined wave height, wind speed, and wind direction can be automatically determined. As a result, while considering the safety of navigation,
It is possible to automatically determine a route that can reach a fishing ground where good fishing can be expected in the shortest time.

According to a twenty-third aspect of the present invention, in the water temperature chart creating system according to the twenty-second aspect, the route selection means passes through each point which divides a great circle from the departure point X0 to the destination Xf into N + 1 equal parts, and X0 to Xf A set of grid points {Xi} (i = 1, 2,... N) is provided on N great circles that are orthogonal to the great circle up to and the navigation speed between X0 to X1 specified by the user. The voyage time T1 (X1) of the ram line from X0 to each X1 is calculated for each X1, and the wave / wind prediction information of the grid point X1 at T0 + T1 (X1) is obtained by referring to the wave / wind prediction information file. If the wave / wind prediction information does not satisfy the conditions of the received predetermined wave height and / or wind speed and / or wind direction, the grid point X1 is excluded from the target of the subsequent processing, and then specified by the user. X1
Based on the navigation speed between X2, the navigation time T2 (X2) from each X1 to each X2 is calculated for each X2, and X0 to X0
The shortest cruising time of X2 is T2 (X2), the starting grid point X1 giving the minimum value is X1 (X2), and the wave / wind prediction information file is referred to, and the grid point X2 at T0 + T2 (X2) is referred to.
If the wave / wind prediction information does not satisfy the predetermined conditions of the received wave height and / or wind speed and / or wind direction, the grid point X2 is excluded from the target of the subsequent processing. , And thereafter, each grid point (N = 3, 4, 5, 6,...)
By repeating the above processing for N), X3, X
4, X5, X6,... Xn are obtained, and the starting lattice point Xn-1 (Xn) to Xn is stored as Xn-1, Xn-1 and the starting lattice point Xn-2 (Xn- 1) is Xn-
Xn-3, Xn-4,... X
1. A water temperature chart creation system, characterized in that it is a route selection means for determining a route connecting the respective grid points to a route from the starting point X0 to the destination Xf.

According to the present invention, the user on the ship can determine the destination and the passing point while looking at the water temperature chart, and can know the prediction information of the wave height, wind speed and wind direction at the arrival time of the destination and the passing point. Instead, the shortest route that avoids points that do not satisfy the conditions of the predetermined wave height, wind speed, and wind direction can be automatically determined. As a result, while considering the safety of navigation,
It is possible to automatically determine a route that can reach a fishing ground where good fishing can be expected in the shortest time.

[0064]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a water temperature chart creation system according to an embodiment of the present invention.

The satellite image data received from the satellite is input from the satellite image input means 2, and the reference image generating means 4 generates a reference image based on the plurality of input satellite images.

The satellite image data to be processed is input from the satellite image input means 2 to the cloud area identification means 6, and the cloud area identification means 6 identifies the cloud and the noise area around it (hereinafter referred to as "cloud area"). Done.

The result of the cloud area discriminating means 6 is the missing area removing means 8
Is removed by the missing area removing means 8.

The operation of interpolating the water temperature data of the removed missing measurement area is performed by the interpolation means 10, and the interpolated water temperature chart is output from the water temperature chart output means 12.

These processes are actually executed by an arithmetic system such as a computer, and each process is realized by a program.

FIG. 2 is a flowchart showing the processing procedure of the water temperature chart creation system.

In step 21, satellite image data to be processed is read, in step 23 a cloud area is identified, and in step 24 the cloud area is removed. In step 25, the water temperature data of the removed area (hereinafter referred to as “missing measurement area”) is interpolated by calculation, and the interpolated water temperature map is output in step 26.

The water temperature chart created in step 26 may be sent to step 22 and stored in the database, and may be used as a reference image when a subsequent water temperature chart is created.

The creation of the reference image in step 22 is as follows:
It is performed by the following method.

First, in the first processing after the operation of the system, a plurality of satellite image data over a predetermined period are synthesized by a maximum value synthesizing method which has been already proposed to create a synthesized image. At this time, the period of the combination may be determined so that the cloud area included in the combined image is as small as possible. If a cloud area is included in the composite image created in this way, to interpolate the water temperature value of the cloud area,
What is necessary is just to perform the missing area removal process of step 23 and the missing area interpolation process of step 24 with respect to the said composite image. In this way, a composite image in which the water temperature of the missing area is interpolated is obtained. In the first processing after the operation of the system, the composite image is used as a reference image.

Alternatively, if a satellite image on a very sunny day can be obtained immediately before the start of the analysis, this may be used as a reference image.

In the second and subsequent processes, the water temperature chart created in the immediately preceding process may be used as a reference image.

FIG. 3 is a flowchart for creating a composite image.

In step 31, an unprocessed pixel is selected.

At step 32, the pixel value of the selected pixel is extracted from each satellite image data.

In step 33, the maximum value among the extracted pixel values is obtained.

In step 34, the maximum value is set to the pixel value of the selected pixel of the composite image.

In step 35, it is determined whether or not the processing has been completed for all the pixels. If not, the process returns to the start and repeats until the processing is completed.

FIG. 4 is a flowchart of a process for removing a cloud area from satellite image data to be processed.

First, in step 41, an unprocessed pixel is selected.

In step 42, the pixel value of the selected pixel is compared with a predetermined threshold.

If the pixel value of the selected pixel is smaller than a predetermined threshold, it is determined that the pixel has a possibility that the temperature is not the water temperature, and the pixel is specified as a cloud area in step 43. The pixel value of the pixel identified as the cloud area may be set to a value that cannot be NULL or a water temperature.

If the pixel is larger than a predetermined threshold,
In step 44, the area is specified as a clear area. The water temperature data of the satellite image data is left as it is in the pixel value of the pixel specified as the clear area.

As the method of determining the predetermined threshold, the temperature data of the cloud area is measured as a value that is considerably lower than the water temperature based on an empirical rule, and thus the predetermined threshold employs a value that cannot be a normal water temperature. do it.

Alternatively, a predetermined range S around the pixel in the reference image corresponding to the pixel selected in step 41
The minimum value among the pixel values of the pixels included in the pixel (hereinafter referred to as “range S”) may be adopted as the predetermined threshold.
The range S may be determined empirically, but since the moving speed of the water body is about 30 km per day, if the time interval between the creation of the reference image and the image data to be processed is about one day, the range S is set to 30 to What is necessary is just 40 km. When the range S is determined in this manner, a pixel indicating a temperature lower than the minimum value of the water temperature data within the range is highly likely to be a cloud area. Therefore, the minimum value can be used as a threshold.

In step 45, it is determined whether or not the processing has been completed for all the pixels. If the processing has not been completed, the process returns to the start and repeats until the processing for all the pixels in the missing area is completed. In this case, for example, the processing is sequentially advanced rightward from the upper left pixel of the unprocessed image, and if all the pixels in the first row have been processed, then the pixels in the second row of the unprocessed image are next processed. May be repeated from the leftmost pixel to the right.

As a method of specifying and removing the cloud area, as a rule of thumb, the isotherm of the water temperature distribution near the boundary between the cloud area and the clear area changes more complicatedly than the isotherm of the water temperature distribution in the clear area. For this reason, even if a method is used in which a region surrounded by isotherms having a predetermined frequency or higher is specified as a cloud area by obtaining the frequency of a water temperature isotherm using a well-known two-dimensional DFT method. Good.

In this manner, a satellite image diagram 21 is obtained in which the missing measurement area is identified and the water temperature data is removed.

Next, a process of interpolating the water temperature data in the missing measurement area is performed. As a rule of thumb, it is known that the water temperature of a specific area has a correlation that depends on the water temperature of the surrounding area and the distance, and that the water temperature of a short distance area is larger than the correlation of the water temperature of a longer distance area. ing. Therefore, it is possible to analyze the water temperature in the missing measurement area using the water temperature data in the area around the missing measurement area.

FIG. 5 is a flowchart showing an example of the missing area interpolation processing procedure.

In step 51, one of the unprocessed pixels P0 in the missing area is selected. For example, the pixel value of each pixel is sequentially examined in the right direction from the upper left pixel of the unprocessed image to determine whether or not the pixel is in the missing area. The pixel value of each pixel in the second row of the unprocessed image may be sequentially examined rightward from the leftmost pixel.

In step 52, each pixel value of each pixel in a clear region included in a range within a radius R1 which is a predetermined influence range from the selected pixel P0 is extracted. If the radius R1 is 30 to 40 km as an actual distance, practical accuracy can be ensured.

In step 53, the standard deviation of each pixel value of the pixels within the radius R1 is calculated, and pixel values exceeding the predetermined standard deviation range are excluded. The pixel value of the excluded pixel may be set to a value that cannot be NULL or a water temperature. This is because if the pixel value of a certain pixel is significantly different from other pixel values in the affected range, the pixel value of the pixel may include an error, and is excluded from the subsequent processing. is there. This enables more accurate interpolation processing.

As a result of this processing, all pixel values within the radius R1 may be excluded. In this case, for a pixel in a range within a radius R2 larger than the radius R1,
The same processing is performed. As a result, if one or more pixel values remain, the next step may be performed. In this case, when all the pixel values are excluded, the same processing may be repeated while increasing the radius until one or more pixel values remain.

In step 54, the remaining pixel values are weighted and averaged using the distance from the pixel P0 as a weight.
In step 55, the pixel value of the pixel P0 is set.

As a method of calculating the weighted average, a method may be used in which the weight applied to the pixel values of the pixels in the clear area is simply inversely proportional to the distance between P0 and each pixel in the clear area. According to the method, more accurate interpolation can be performed.

That is, the pixel value of the pixel P0 after interpolation can be obtained by the following calculation.

(Equation 1)

[0103]

(Equation 2)

[0104]

The above calculation method is merely an example, and it goes without saying that a calculation method using a weighted average based on a different weight from the above calculation method may be used.

These series of processes (steps 51 to 55) are repeatedly executed for all pixels (step 5).
6), end the process.

As a result, the cloud area included in the satellite image is removed as a missing area, and the pixel value of the removed pixel can be accurately interpolated using the pixel values of the surrounding clear area, and the pixel values of all the pixels can be removed. The pixel values are calculated, and a water temperature chart is generated by interpolating the water temperature data of the cloud area as shown in FIG.

FIG. 6 is an explanatory diagram showing another example of the interpolation processing procedure for the missing area.

First, prior to the processing of step 51, the pixel values of the pixels at the same position are transplanted from the reference image into the missing area. It is not always necessary to transfer the pixel values of the pixels at exactly the same position, and pixel values at different positions may be transferred. At this time, the transplant portion is set to a range smaller than the missing measurement area by a predetermined width. The predetermined width is set to a value smaller than the influence radius R _max . As a result, the missing area of the portion that has not been transplanted becomes a donut shape. This is shown at 61 in FIG.

Steps 51 to 55 are repeatedly executed for all the pixels included in the donut-shaped area. Thereby, the water temperature data of all the pixels included in the donut-shaped area are interpolated.

Next, the processing of steps 51 to 55 is repeatedly executed for all the pixels included in the donut-shaped region having the predetermined width inside the donut-shaped region in which the water temperature data is interpolated. This situation is shown in FIG.
Shown in This process is repeatedly performed for all the pixels included in the missing area, and the process ends.

According to the above-described interpolation processing procedure, since a part of the missing area is transplanted from the reference image and the interpolation processing is performed using the part, when the missing area is wide, only the water temperature data in the clear area is used. There is an advantage that interpolation processing with higher accuracy can be performed than when performing interpolation.

Note that if the influence radius R _max is set so as to include the pixels transplanted from the reference image, the error of the interpolation processing can be reduced, and if the influence radius is reduced, the time required for the interpolation processing can be shortened. Therefore, if the transplant range is set large inside the missing area and the influence radius R _max is set small,
A water temperature chart having a desired error level can be obtained in a desired time.

Further, the radius of influence is set as large as possible around the tide boundary where the Kuroshio and Oyashio are mixed, and small at places where the water temperature change is small, such as the central part of the Kuroshio.
Time and error can be reduced. Therefore, by setting the radius of influence in accordance with each sea area where the magnitude of the water temperature change is different, a water temperature chart with a small error can be obtained in a relatively short processing time.

The water temperature chart created in this way is input to the reference image creating means 2 and is prepared for the next satellite image data processing as a reference image for processing new satellite image data.

By repeating these processes, as a result,
By creating a water temperature chart in which the water temperature data of the missing measurement area is interpolated every day, a daily water temperature chart can be obtained.

FIG. 7 is an overall configuration diagram of the water temperature chart creation system.

The water temperature chart creation system 701 is connected to a client system 703 via a communication network 702.
Meteorological Agency computer system 704 and satellite 70
5 and perform data communication. If the Internet is used as the communication network 702 connecting the water temperature chart creation system 701 and the client system 703, many or unspecified users can easily use the water temperature chart creation system 701.

The receiving means 706 receives information on the display area of the water temperature chart, information on the minimum water temperature value and / or the maximum water temperature value and / or the water temperature width and / or the number of water temperature divisions in the display of the water temperature chart from the client system. It receives information on the ground, destination and zero or more passing points, or information on a predetermined wave height and / or wind speed and / or direction.

The water temperature chart screen creating means 707 includes the receiving means 7
A water temperature chart screen to be transmitted to the client system 703 is created using the water temperature chart data file 709 based on the information received in step 06 and / or similar information set in the client system in advance.

[0121] The water temperature chart creating means 708 includes an artificial satellite 705.
Based on the satellite image data received from, the cloud area identification / removal / water temperature interpolation processing is performed, and the water temperature chart data without missing measurement areas is recorded in the water temperature chart data file 709.

The route selection means 710 receives the information of the starting point, destination and zero or one or more passing points inputted from the receiving means 706, or a predetermined wave height and / or wind speed and / or
Alternatively, based on the information on the wind direction, the shortest route is calculated and selected while avoiding the point of the predetermined wave height and / or wind speed and / or wind direction.

The wave / wind information predicting means 711 is based on the route information and the wave / wind prediction information file 714 input from the route selecting means 710, and calculates the wave height at the destination and zero or more than one or more passing points. And / or wind speed and / or wind direction prediction information is obtained.

The wave / wind information receiving means 712 receives wave / wind forecast information from the Meteorological Agency computer system 704,
The wave / wind information recording unit stores the wave / wind forecast information input from the wave / wind information receiving unit 712 in the wave / wind prediction information file 71.
Record in 4. The Meteorological Agency computer system 70
The wave / wind forecast information received from 4 includes wave height, wind speed, and wind direction forecast data for each time zone in each region.
In particular, it is known that the accuracy of forecasting is considerably high because there is no undulation such as mountains on the sea.

The transmitting means 715 sends the client system 703 a water temperature chart screen of the position and size of the display target area specified by the client system, the minimum water temperature value and the maximum water temperature value specified by the client system, and the water temperature width or The water temperature division number, or the water temperature map screen created according to the minimum or maximum water temperature value, the water temperature width and the water temperature division number, or the destination and zero or more than one destination specified by the client system in accordance with the water temperature map The wave height and / or wind speed and / or wind direction prediction information at the passing date and time and the route screen for avoiding the wave height, wind direction and wind speed specified by the client system are transmitted.

FIG. 8 shows a screen transmitted from the water temperature chart creating means to the client system in order to first select the position of the display target area in the client system. The user of the client system makes a selection by clicking on each sea area on the screen with a mouse or the like.

For example, when “Okhotsk Sea Area” is selected here, the screen shown in FIG. 9 is transmitted from the water temperature chart creation system to the client system.

FIG. 10 shows a state in which a part of the currently displayed area is changed to a more detailed screen by clicking a “detail” button displayed on the screen of the client system. I have.

FIG. 11 shows a state in which, by clicking a “reduce” button displayed on the screen of the client system, the currently displayed area is reduced and the screen transits to a screen displaying a wider area. ing.

FIG. 12 is a diagram showing an example of clicking the “East”, “West”, “South” and “North” buttons displayed on the screen of the client system, as shown in FIG.
This shows a transition to a screen displaying the east, west, north and south regions of the currently displayed region.

FIG. 14 shows a state in which the area to be displayed and the resolution of the image to be displayed are selected on the screen of the client system.

FIG. 15 shows how the minimum water temperature and the water temperature range to be displayed are selected on the screen of the client system.

FIG. 16 shows a state in which the display of the water temperature chart of the isotherm display and the display of the water temperature chart of the pixel unit display are switched on the screen of the client system.

FIG. 17 shows how to switch the display of longitude / latitude lines on the screen of the client system.

FIG. 18 shows a state in which a destination or a passing point for selecting a route is input on the screen of the client system. The user can select a destination or a passing point by clicking a desired position on the “analysis point selection area” with a mouse.

FIG. 19 shows a screen of the client system in which the prediction information such as the wave height, the wind speed, and the wind direction at the date and time of arrival at the destination and the passing point specified by the client system is displayed. The arrow in the "predicted value graph display" indicates the wind direction by its direction.

FIG. 20 is an explanatory diagram of the route selection means.

There is a case where a ship desires a temporary passing point based on a water temperature map, but wants to sail while avoiding sea areas where the conditions of wave direction, wind speed and wind direction are poor. Therefore, a method of selecting a shortest route within a predetermined wave height and / or wind speed and / or wind direction condition that is not satisfied by a user of the client system while avoiding a point that does not satisfy the condition will be described with reference to FIG. .

First, a grid point set ｛is set on N large circles that pass through points that divide the great circle from the starting point X0 to the destination Xf into N + 1 equal parts and that are orthogonal to the great circles X0 to Xf. Xi｝
(I = 1, 2,..., N) are provided.

Next, at time T0, the ship is started from the departure place X0 and travels along the ram line to each X1. X
The voyage time T1 (X1) from 0 to X1 is calculated for each X1. T1 (X1) is obtained based on the navigation speed between X0 and X1 specified by the user.

Then, referring to the wave / wind prediction information file 714, the wave / wind of the grid point X1 at T0 + T1 (X1) is obtained.
Find wind prediction information. If the wave / wind prediction information does not satisfy the weather conditions specified in advance by the user, the grid point X
1 is excluded from the target of the subsequent processing.

Next, the ship is started from each X1 at time T0 + T1 (X1) and sails along the ram line up to each X2. Then, for each X2, the sum of the voyage times of X1 to X2 and T1 (X1) is compared, and the minimum value of the sum, that is, the shortest voyage time of X0 to X2 is T2 (X2), and the starting grid point which gives the minimum value. X1 is defined as X1 (X2).

Then, referring to the wave / wind prediction information file 714, the wave / wind of the grid point X2 at T0 + T2 (X2) is obtained.
Find wind prediction information. If the wave / wind prediction information does not satisfy the weather conditions specified in advance by the user, the grid point X
2 is excluded from the target of the subsequent processing.

Thereafter, each grid point (N = 3, 4, 5, 6,...)
· By repeating the above for N), X3, X
, X5, X6,... Xn are obtained.

Then, the starting grid point Xn-1 to Xn
(Xn) is stored as Xn-1, Xn-1 and the starting lattice point Xn-2 (Xn-1) to Xn-1 is set to Xn-2, and thereafter, Xn-3, Xn-4,. X1 is required. The line connecting these grid points is the shortest route satisfying a predetermined weather condition from the departure point X0 to the destination Xf.

[0146]

As described above, the present invention automatically uses the satellite image data obtained from an artificial satellite to automatically map the water temperature of the sea surface without any loss due to the cloud area and its surrounding noise area automatically on a daily basis. And process the obtained water temperature chart data into a format that can be used by information equipment such as a personal computer installed on the ship, making it possible to flexibly and effectively use the water temperature distribution data on the ship It was done. Further, the present invention, together with the obtained water temperature chart data, the wave height, wind direction, wind speed data on the navigation route predicted based on the weather forecast and the navigation speed, the information device such as a personal computer installed in the ship By processing the data into a usable format, it is possible to flexibly and effectively use the wave / wind data together with the water temperature chart data on the ship.

Therefore, with the water temperature chart creation system according to the present invention, the missing point and the error due to the cloud area and the noise due to the cloud area, which are the biggest defects of the satellite image data, are automatically removed without requiring special skills. By performing interpolation, a useful sea surface temperature map free of noise such as cloud areas can be created from satellite image data every day. Also,
By flexibly referencing the obtained water temperature chart with information equipment such as a personal computer installed on the ship, it is possible to select fishing grounds where high fishing can be expected, and to select destinations and shipping routes in consideration of cooling water and weather information of the engine. Can be selected.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a water temperature chart creation system according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a processing procedure of a water temperature chart creating system;

FIG. 3 is a flowchart for creating a composite image.

FIG. 4 is a flowchart of a process of removing a cloud area from satellite image data to be processed;

FIG. 5 is a flowchart illustrating an example of a missing measurement area interpolation processing procedure;

FIG. 6 is an explanatory diagram of another example of the missing area interpolation processing procedure;

FIG. 7 is an overall configuration diagram of a water temperature chart creation system.

FIG. 8 is a screen transmitted from the water temperature diagram creating unit to the client system in order to first select the position of the display target area in the client system.

FIG. 9 is a water temperature diagram of an area designated by the client system displayed on the client system.

FIG. 10 is a screen of a water temperature chart in which the water temperature chart displayed immediately before on the client system is enlarged.

FIG. 11 is a water temperature chart screen obtained by reducing the water temperature chart displayed on the client system immediately before;

FIG. 12 is a diagram illustrating buttons for transitioning to a screen of an area of east, west, north and south of an area displayed on the client system.

FIG. 13 is a diagram illustrating a state in which the screen is shifted to a north-south-north-south area screen of the area displayed on the client system;

FIG. 14 is a diagram illustrating a state in which a display target area and a resolution of an image to be displayed are selected on a screen of the client system.

FIG. 15 is a diagram showing a state where a minimum water temperature and a water temperature range to be displayed are selected on the screen of the client system.

FIG. 16 is a diagram showing a state in which a display of a water temperature diagram in an isotherm display and a display of a water temperature diagram in a pixel unit display are switched on a screen of a client system.

FIG. 17 is a diagram showing a state of switching between displaying and not displaying longitude / latitude lines on the screen of the client system.

FIG. 18 is a diagram showing a manner of inputting a destination or a passing point for selecting a route on the screen of the client system.

FIG. 19 is a diagram showing prediction information such as a wave height, a wind speed, and a wind direction at a destination and a passing point arrival date and time designated by the client system on a screen of the client system.

FIG. 20 is an explanatory diagram of a route selection means.

FIG. 21 is a satellite image in which missing temperature areas are identified and water temperature data is removed.

FIG. 22 is a water temperature diagram after interpolating the water temperature data in the missing measurement area based on the satellite image from which the missing measurement area has been identified and the water temperature data has been removed.

[Explanation of symbols]

 2 Satellite image input means 4 Reference image synthesizing means 6 Cloud area discriminating means 8 Missing area removing means 10 Interpolating means 12 Water temperature map output means 701 Water temperature map creation system 702 Communication network 703 Client system 704 JMA computer system 705 Artificial satellite 706 Receiving means 707 Water temperature map screen creation means 708 Water temperature map creation means 709 Water temperature map data file 710 Route selection means 711 Wave / wind information prediction means 712 Wave / wind information reception means 713 Wave / wind information recording means 714 Wave / wind information file 715 Transmission means

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) G09B 29/00 G09B 29/00 AZ F Term (Reference) 2C032 HB03 HB11 HB22 HB25 HB31 HC09 HC24 HC27 HD21 5B057 AA14 CA08 CA12 CA16 CB08 CB12 CB16 CD06 CE08 DA08 DB02 DB09

Claims (23)

[Claims] 1. A water temperature chart creation method for creating a water temperature chart from satellite image data obtained from an artificial satellite, comprising: comparing all pixel values in a predetermined area of satellite image data to be processed with a predetermined threshold value; A cloud area identification step of generating a cloud area identification image by identifying an area having a value lower than a predetermined threshold as a cloud area; and setting the pixel value of the identified cloud area to a value that cannot be a water temperature, and A cloud area removing step of distinguishing between the pixel value of the cloud area and the pixel value of the cloud area and creating a cloud area removed image by removing the cloud area; and a pixel value of the cloud area using the pixel value of the clear area pixel. A cloud area pixel value interpolating step of generating an interpolated image by interpolating the pixel values of (c) by calculation. 2. A water temperature chart creation method for creating a water temperature chart from satellite image data obtained from an artificial satellite, wherein a maximum value of pixel values of the same pixel is determined from a plurality of satellite image data obtained during a predetermined period. A reference image setting step of creating composite image data by maximum value synthesis set as a pixel value of a pixel; comparing all pixel values within a predetermined region of the satellite image data to be processed with a predetermined threshold; By identifying a region having a lower value as a cloud region, a cloud region identification step of generating a cloud region identification image, and setting the pixel value of the identified cloud region to a value that cannot be a water temperature, and setting a pixel in a clear region A cloud area removing step of creating a cloud area-removed image by discriminating the values from the pixel values of the cloud area, and removing the cloud area. The pixel value of the pixel is transplanted, and the pixel value of the pixel in the cloud area excluding the transplanted area is calculated and interpolated using the pixel value of the transplant area and the pixel value of the clear area. A series of processes in the above-described process is performed on an area smaller by a predetermined width inside the set area toward the center of the cloud area while gradually reducing the area toward the inside of the area, thereby forming a cloud area. A water temperature map creating method, comprising: a cloud area pixel value interpolating step for interpolating all. 3. A water temperature chart creation method for creating a water temperature chart from satellite image data obtained from an artificial satellite, wherein in a first process, the same pixel is extracted from a plurality of satellite image data obtained during a predetermined period. Synthesized image data is created by maximum value synthesis in which the maximum value of the pixel values is set as the pixel value of the same pixel, and the synthesized image data is used as a reference image. A reference image setting step of using the created interpolation image as a reference image, and comparing all pixel values within a predetermined area of the satellite image data to be processed with a predetermined threshold, and determining an area having a value lower than the predetermined threshold. A cloud area identification step of generating a cloud area identification image by identifying the cloud area as a cloud area, and setting the pixel value of the identified cloud area to a value that cannot be the water temperature, and a pixel value of a clear area A cloud area removing step of creating a cloud area removed image by removing the cloud area by distinguishing the pixel value of the cloud area from the pixel value of the cloud area. Is interpolated while calculating the pixel values of the pixels in the cloud area excluding the transplanted area using the pixel values in the transplant area and the pixel values in the clear area, and then interpolated by the above processing. A series of processes in the above-described process is performed on an area smaller than the area by a predetermined width inside the area, and the processing is advanced to the center of the cloud area while gradually reducing the area toward the inside of the area, and all the cloud area is processed. A method for interpolating cloud area pixel value interpolation. 4. The method according to claim 1, wherein the step of interpolating the cloud area pixel value comprises the step of interpolating a predetermined value or a predetermined calculated value among pixel values in a clear area within a predetermined range around the pixel to be interpolated. It is a cloud area pixel value interpolation step of generating an interpolated image by excluding the pixel values exceeding the value from the processing target and interpolating the pixel values of the cloud area by calculation using the remaining clear area pixel values. Characteristic water temperature chart creation method. 5. The method according to claim 2, wherein the step of interpolating the cloud area pixel value comprises the step of interpolating a predetermined value among pixel values of a clear area and a transplant area within a predetermined range around the pixel to be interpolated. Alternatively, pixel values exceeding a predetermined calculated value are excluded from the processing target, and the pixel values of the pixels in the cloud area excluding the transplanted area are calculated using the pixel values of the remaining transplant area and the pixel values of the clear area. Then, for a region smaller by a predetermined width inside the region interpolated by the above-mentioned process, a series of processes in the above-mentioned process is performed while taking the region smaller in order toward the inside of the region, A water temperature chart creation method, which is a cloud area pixel value interpolation step of performing processing to the center and interpolating all cloud areas. 6. The water temperature chart creating method according to claim 1, wherein the calculation method for complementing the pixel value of the cloud area includes: calculating a pixel value of each pixel to be processed within a predetermined range around the pixel to be interpolated;
A water temperature chart creation method, which is a cloud area pixel value interpolation step, which is a calculation method for obtaining an interpolation target pixel value by performing a weighted average of a distance between each pixel and the interpolation target pixel as a weight element. 7. The water temperature chart creating method according to claim 1, wherein the predetermined threshold value is a minimum value among pixel values of pixels included in a predetermined range around pixels of the reference image at the same position as the interpolation target pixel. A water temperature chart creation method, which is a cloud area identification step using the following. 8. The water temperature chart creation method according to claim 1, wherein the series of steps are repeated daily to generate a daily water temperature chart and output the daily water temperature chart. . 9. A water temperature chart creation system for creating a water temperature chart from satellite image data obtained from an artificial satellite, comprising: comparing all pixel values in a predetermined area of satellite image data to be processed with a predetermined threshold value; A cloud area identification unit that generates a cloud area identification image by identifying an area having a value lower than a predetermined threshold value as a cloud area; and setting the pixel value of the identified cloud area to a value that cannot be considered as a water temperature. Cloud area removing means for distinguishing between the pixel value of the cloud area and the pixel value of the cloud area and creating a cloud area removed image by removing the cloud area, and the pixel value of the cloud area using the pixel value of the clear area pixel And a cloud area pixel value interpolating means for generating an interpolated image by interpolating the pixel values of the water temperature map by calculation. 10. A water temperature chart creating system for creating a water temperature chart from satellite image data obtained from an artificial satellite, wherein a maximum value of pixel values of the same pixel is determined from a plurality of satellite image data obtained during a predetermined period. Reference image setting means for creating composite image data by maximum value synthesis set as a pixel value of a pixel; comparing all pixel values in a predetermined area of the satellite image data to be processed with a predetermined threshold, and comparing the predetermined threshold By identifying a region having a lower value as a cloud region, a cloud region identification unit that generates a cloud region identification image, and setting the pixel value of the identified cloud region to a value that cannot be a water temperature, and setting pixels in a clear region Cloud area removing means for distinguishing between the pixel value of the cloud area and the pixel value of the cloud area and removing the cloud area to create a cloud area-removed image; Pixel The pixel value is transplanted, and the pixel value of the pixel in the cloud area excluding the transplanted area is calculated and interpolated using the pixel value of the transplant area and the pixel value of the clear area, and then the pixel value is interpolated by the above processing. For a region that is smaller by a predetermined width inside the region, a series of processes in the above-described processing are performed toward the center of the cloud region while gradually reducing the region toward the inside of the region, and all the cloud regions are interpolated And a cloud area pixel value interpolating unit. 11. A water temperature chart creation system for creating a water temperature chart from satellite image data obtained from an artificial satellite. In the first processing, the same pixel is extracted from a plurality of satellite image data obtained during a predetermined period. Synthesized image data is created by maximum value synthesis in which the maximum value of the pixel values is set as the pixel value of the same pixel, and the synthesized image data is used as a reference image. A reference image setting unit that uses the created interpolation image as a reference image, and compares all pixel values within a predetermined area of the satellite image data to be processed with a predetermined threshold, and determines an area having a value lower than the predetermined threshold. By identifying as a cloud area, a cloud area identification unit that generates a cloud area identification image, and setting the pixel value of the identified cloud area to a value that cannot be the water temperature, and setting the pixel value of the clear area to be A cloud area removing unit that creates a cloud area-removed image by distinguishing the pixel value of the cloud area and removes the cloud area; and an area smaller than the same pixel of the reference image by a predetermined width inside the cloud area. The pixel value is transplanted, and the pixel value of the pixel in the cloud area excluding the transplanted area is calculated and interpolated using the pixel value of the transplant area and the pixel value of the clear area, and then the pixel value is interpolated by the above processing. For a region that is smaller by a predetermined width inside the region, a series of processes in the above-described processing are performed toward the center of the cloud region while gradually reducing the region toward the inside of the region, and all the cloud regions are interpolated And a cloud area pixel value interpolating unit. 12. The water temperature chart creation system according to claim 9, wherein the cloud area pixel value interpolating means includes a predetermined value or a predetermined calculated value among pixel values in a fine area within a predetermined range around the interpolation target pixel. It is a cloud area pixel value interpolating means for generating an interpolated image by excluding the pixel values exceeding the value from the processing target and interpolating the pixel values of the cloud area by calculation using the remaining fine area pixel values. Characteristic water temperature chart creation system. 13. The water temperature chart creating system according to claim 10, wherein the cloud area pixel value interpolating means includes a predetermined value among pixel values of a clear area and a transplant area within a predetermined range around a pixel to be interpolated. Alternatively, pixel values exceeding a predetermined calculated value are excluded from the processing target, and using the pixel values of the remaining transplant area and the pixel values of the fine area,
Interpolation is performed while calculating the pixel values of the pixels in the cloud area excluding the transplanted area, and then a series of processing in the processing is performed on the area smaller than the area interpolated by the processing by a predetermined width. A water temperature chart creation system, which is a cloud area pixel value interpolating means for performing processing up to the center of the cloud area while sequentially reducing the area inward, and interpolating the entire cloud area. 14. The water temperature chart creating system according to claim 9, wherein the calculation system for complementing the pixel value of the cloud area includes the pixel value of each pixel to be processed within a predetermined range around the pixel to be interpolated. A water temperature chart creating system, which is a cloud area pixel value interpolating unit that is a calculation system that obtains an interpolation target pixel value by performing a weighted average of a distance between each pixel and an interpolation target pixel as a weight element. 15. The water temperature chart creation system according to claim 9, wherein the predetermined threshold value is a minimum value among pixel values of pixels included in a predetermined range around pixels of the reference image at the same position as the interpolation target pixel. A water temperature chart creation system, characterized in that it is a cloud area identification unit that uses a computer. 16. The water temperature chart creation system according to claim 9, wherein said series of means is repeated daily to generate a daily water temperature chart and output a daily water temperature chart. . 17. The water temperature chart creating system according to claim 9, wherein receiving means for receiving information of a display target area of the water temperature chart from the client system, and a water temperature chart of the display target area designated by the client system. A water temperature chart creation system, comprising: a water temperature chart screen creation means for creating a screen; and a transmission means for sending the created water temperature chart to a client system. 18. The water temperature chart creating system according to claim 17, wherein information on the minimum water temperature value and / or the maximum water temperature value and / or the water temperature width and / or the number of water temperature divisions in the display of the water temperature chart is received from the client system. Receiving means, and a minimum water temperature value designated by the client system or preset in the client system and / or
Or a water temperature chart screen creating means for creating a water temperature chart screen according to a maximum water temperature value and / or a water temperature width and / or a water temperature division number, and a transmitting means for transmitting the created image to the client system. Water temperature chart creation system. 19. The water temperature chart creation system according to claim 17, wherein the water temperature chart screen creation means expresses the water temperature for each pixel using color and / or shading. . 20. The water temperature chart creation system according to claim 17, wherein the water temperature chart screen creation means expresses the water temperature using isothermal lines. 21. The water temperature chart creation system according to claim 17, wherein the wave and / or wind information receiving means for receiving wave and / or wind information from the Meteorological Agency computer system via a communication network; Route information receiving means for receiving information on the place, destination and zero or one or more passing points; route selecting means for calculating the shortest route between the starting point, destination and zero or one or more passing points; Wave / wind forecast information receiving means for receiving wave / wind forecast information from the Meteorological Agency computer system, wave / wind forecast information recording means for recording received wave / wind forecast information, and using the recorded wave / wind forecast information Wave / wind information prediction means for obtaining prediction information of a wave height and / or a wind speed and / or a wind direction at a destination and zero or at least one passing point arrival date and time; In addition to the water temperature chart screen created by the thermogram screen creating means, transmitting means for transmitting prediction information of the wave height and / or wind speed and / or wind direction at the destination and zero or at least one passing point arrival date to the client system And a water temperature chart creating system. 22. The water temperature chart creating system according to claim 21, further comprising: wave / wind information receiving means for receiving predetermined wave height and / or wind speed and / or wind direction information from the client system; In calculating the shortest route between the departure point, the destination and zero or one or more passing points, avoiding points that do not satisfy the predetermined wave height and / or wind speed and / or wind direction conditions received, A water temperature chart creation system, which is a route selection means for calculating. 23. The water temperature chart creating system according to claim 22, wherein the route selecting means includes a large circle from X0 to Xf passing through each point that divides a large circle from the departure point X0 to the destination Xf into N + 1 equal parts. A set of lattice points {Xi} (i = 1, 2,... N) on N orthogonal great circles
And a navigation time T1 of the ram line from X to each X1 based on the navigation speed between X0 and X1 specified by the user.
(X1) is calculated for each X1, and the wave / wind prediction information file is referred to, and T0 + T1 (X1)
If the wave / wind prediction information does not satisfy the conditions of the predetermined wave height and / or wind speed and / or wind direction received by the wave / wind prediction information, the grid point X1 is subjected to the subsequent processing. Then, based on the navigation speed between X1 and X2 specified by the user, the navigation time T2 from each X1 to each X2
(X2) is calculated for each X2, the shortest cruising time of X0 to X2 is T2 (X2), the starting grid point X1 that gives the minimum value is X1 (X2), and the wave / wind prediction information file is referred to, and T0 + T2 ( X2)
If the wave / wind prediction information does not satisfy the conditions of the predetermined wave height and / or wind speed and / or wind direction received, the grid point X2 is determined by the following processing. Then, the above processing is repeated for each grid point (N = 3, 4, 5, 6... N) to obtain X3, X4, X5
X6,... Xn, and the starting grid point Xn-1 (Xn) to Xn is Xn-1, Xn
The starting lattice point Xn-2 (X
n-1) is defined as Xn-2, and thereafter, Xn-3, X
.., X1 are obtained, and a line connecting these grid points is connected from the starting point X0 to the destination Xf.
A water temperature chart creating system, which is a route selecting means for setting a route up to the route.