JP7444268B2 - Measured data processing device, measured data processing method and program - Google Patents

Description

The present disclosure relates to a technique for processing measurement data, and particularly to a technique for processing measurement data by synthetic aperture radar.

As a result of measuring the ground surface using the synthetic aperture radar, for example, information on the height from a predetermined reference plane at a plurality of measurement points on the ground surface is obtained. There is a desire to separate those measurement points into measurement points that exist on the surface of an artificial structure and measurement points that exist on the ground surface other than the artificial structure.

An example of a technique for separating regions of man-made structures in two-dimensional measurement data is disclosed in Patent Document 1. The method described in Patent Document 1 extracts a closed region of a steep slope in a three-dimensional shape of a target calculated from a plurality of two-dimensional images as a region of an artificial building.

Japanese Patent Application Publication No. 11-265448

Man-made structures do not necessarily have steep slopes around them. The technique disclosed in Patent Document 1 cannot detect the range of an artificial building unless there is a steeply sloped point such as a wall around the artificial building. Furthermore, images obtained by imaging with an optical camera and observation results obtained by synthetic aperture radar have different properties.

One of the purposes of the present disclosure is to provide a measurement data processing device, etc. that can improve the accuracy of separating measurement points at which the height of the ground surface is observed into measurement points on buildings and measurement points other than buildings. It is about providing.

A measurement data processing device according to an aspect of the present disclosure includes an acquisition unit that acquires measurement data that is data of a measured value of the height of the ground surface at a measurement point measured by a synthetic aperture radar; Based on the information on the height of the ground surface, it is determined whether the measurement point is a building measurement point, which is a measurement point of a building, or a ground measurement point, which is a measurement point other than a building measurement point. A determination means is provided.

A measurement data processing method according to an aspect of the present disclosure acquires measurement data that is data of the measured value of the height of the ground surface at a measurement point measured by a synthetic aperture radar, and Based on the height information, it is determined whether the measurement point is a building measurement point, which is a measurement point of a building, or a ground measurement point, which is a measurement point other than a building measurement point.

A program according to an aspect of the present disclosure includes an acquisition process of acquiring measurement data that is data of the measured value of the height of the ground surface at a measurement point measured by a synthetic aperture radar, and A determination process that determines whether the measurement point is a building measurement point, which is a measurement point of a building, or a ground measurement point, which is a measurement point other than a building measurement point, based on height information. , cause the computer to execute. One aspect of the present disclosure is also realized by a storage medium that stores the above program.

The present disclosure has the effect of improving the accuracy of separating measurement points at which the height of the ground surface is observed into measurement points on buildings and measurement points other than buildings.

FIG. 1 is a block diagram illustrating an example of the configuration of a measurement data processing system according to a first embodiment of the present disclosure. FIG. 2 is a flowchart illustrating an example of the operation of the measurement data processing device according to the first embodiment of the present disclosure. FIG. 3 is a block diagram illustrating an example of the configuration of a measurement data processing device according to a second embodiment of the present disclosure. FIG. 4 is a flowchart illustrating an example of the operation of the measurement data processing device according to the second embodiment of the present disclosure. FIG. 5 is a diagram illustrating an example of the hardware configuration of a computer that can implement the measurement data processing device according to the embodiment of the present disclosure.

Embodiments of the present disclosure will be described in detail with reference to the drawings.

<First embodiment>
First, a first embodiment of the present disclosure will be described.

＜＜Configuration＞＞
FIG. 1 is a block diagram showing an example of the configuration of a measurement data processing system 1 according to the present embodiment. In the example shown in FIG. 1, the measurement data processing system 1 includes a measurement data processing device 100, a measurement data storage device 200, and an output destination device 300. The measurement data processing device 100 is communicably connected to each of the measurement data storage device 200 and the output destination device 300.

The measurement data processing device 100 includes an acquisition section 110, a determination section 120, a noise removal section 130, an output section 140, a ground information storage section 150, and a building information storage section 160.

<<Summary>>
The measurement data storage device 200 stores measurement data of a target at a plurality of measurement points obtained by observation using a synthetic aperture radar. The measurement data includes data on the height of the object from the reference plane at each measurement point.

The determining unit 120 determines whether the measurement point of the measurement data acquired by the acquisition unit 110 from the measurement data storage device 200 is a building measurement point that is a measurement point on a building or is not a building (for example, the ground). It is determined whether the measurement point is a ground measurement point located above. The determination unit 120 may determine whether the measurement point is a building measurement point or a ground measurement point based on the information on the elevation of the ground surface stored in the ground information storage unit 150. The determining unit 120 may further determine whether the measurement point is a building measurement point or a ground measurement point based on the three-dimensional model of the building stored in the building information storage unit 160.

The noise removal unit 130 removes noise from measurement data at measurement points. Specifically, the noise removal unit 130 extracts measurement points (noise measurement points) whose height data is determined to be noise. The noise removal unit 130 may exclude height data at the noise measurement point from the measurement data. The noise removal unit 130 may calculate estimated data of the height at the noise measurement point using height data at measurement points surrounding the noise measurement point.

The output unit 140 outputs measurement data, in which the measurement points are classified into building measurement points and ground measurement points and noise has been removed, to the output destination device 300.

Each component of the measurement data processing system 1 will be described in detail below.

<<Measurement data storage device 200>>
The measurement data storage device 200 stores measurement data.

The measurement data includes, for example, data representing the results of measurements of the height of the ground surface at a plurality of points (hereinafter also referred to as measured values of the height of the ground surface) by the synthetic aperture radar at a certain point in time. The measurement data further includes the change in the result of measuring the height of the ground surface at a certain point in time from the result of measuring the height of the ground surface at the point immediately before that point (hereinafter, the change in the height of the ground surface). Contains data representing measured values and notations. In the description of this disclosure, the Earth's surface is the surface of the Earth. The ground surface includes the ground, the surface of a building, and the like.

The height of the ground surface may be the height of the ground surface from a predetermined reference plane. The ground surface height of measurement data is, for example, the height of multiple points on the ground surface obtained by observation using a radar mounted on a flying object such as an artificial satellite or an aircraft as a synthetic aperture radar (SAR). is the height at the measurement point. In the following explanation, such observation will be referred to as observation using synthetic aperture radar.

A point on the ground surface where a measured value of the height of the ground surface is obtained is referred to as a measurement point.

The change in height may be the difference between the measured height of the ground surface at a point in time and the measured height of the ground surface at a point immediately before that point in time. The change in height is the value expressed by the change per predetermined period in the measured value of the ground surface height at a certain point in time from the measured value of the ground surface height at the point immediately before that point. It may be. The predetermined period may be determined as appropriate. The predetermined period may be, for example, one month. The predetermined period may be, for example, one year. In the following description, a change in the measured value of the height of the ground surface at a certain point in time from the measured value of the height of the ground surface at the point immediately before that point in time is also referred to as a measured value of change in height.

The measurement data includes position data representing the position of the measurement point, data representing the measured value of the ground surface height at the measurement point, and measurement of changes in the ground surface height at the measurement point. The data may include a combination of data representing a value. Information representing the position of a point on the ground surface (ie, measurement point) may be, for example, latitude and longitude information. The information representing the position may be other information that can specify the position on the ground surface. In the following, information representing the position of a point will be referred to as measurement point information.

<<Measurement data processing device 100>>
<<Acquisition unit 110>>
The acquisition unit 110 acquires measurement data from the measurement data storage device 200. The acquisition unit 110 may read all measurement data stored in the measurement data storage device 200. For example, the acquisition unit 110 may extract measurement data of measurement points included in a predetermined range on the ground surface from measurement data stored in the measurement data storage device 200. For example, the acquisition unit 110 may extract measurement data of measurement points included in a range on the ground surface specified by the user of the measurement data processing device 100 from measurement data stored in the measurement data storage device 200. . The range on the ground surface may be input by the user of the measurement data processing device 100 using an input device such as a keyboard, which is omitted in FIG. 1 for simplicity. The acquisition unit 110 may then read the extracted measurement data from the measurement data storage device 200.

Hereinafter, the range on the ground surface that includes the measurement points of the measurement data acquired by the acquisition unit 110 will be referred to as a target range. The target range may be expressed by latitude and longitude, for example.

The acquisition unit 110 sends the acquired measurement data to the determination unit 120. The acquisition unit 110 may further send information representing the target range to the determination unit 120.

<<Ground surface information storage unit 150>>
The ground information storage unit 150 stores ground height data (hereinafter also referred to as ground surface information).

The ground is the surface of the earth in the absence of structures. The ground in the area where the building exists may be a surface that is set as appropriate to be different from the surface of the building. The ground in the area where the building exists may be, for example, a surface obtained by appropriately extending the ground in the area around the building where no building exists according to a predetermined method. The ground in the area where the building exists may be, for example, a horizontal plane at the lowest elevation among the exposed parts of the building. A surface such as a road may be treated as the ground.

The height of the ground may be an altitude. The height of the ground may be a height from a predetermined reference plane. The format of the ground height data may be a general computer readable/readable format.

The ground surface information storage unit 150 may store data representing the height of the ground in a format that allows the height of the ground at a point to be specified based on location information (for example, latitude and longitude) of the point. . Specifically, the data representing the height of the ground may be, for example, data representing the height at each of grid points at regular intervals. The data representing the height of the ground may be expressed, for example, as a set of combinations of a set of coordinates of points on a contour line and a height represented by the contour line. The data representing the height of the ground may be represented by, for example, the coordinates of grid points at predetermined intervals, the height at those coordinates, and a set of triangles whose vertices are these grid points. The data representing the height of the ground may be expressed in a format other than the above example.

<<Building information storage section 160>>
The building information storage unit 160 stores building information that is information about buildings.

The building may be, for example, an artificial three-dimensional structure whose surface is not considered to be the ground.

The building information includes three-dimensional data of the building and location data of the building. Three-dimensional data of a building is data representing the shape (in other words, shape and size) of a building in three-dimensional space. The three-dimensional data of a building may be, for example, polygon data represented by a combination of vertices and lines connecting the vertices. The three-dimensional data of the building may be, for example, a collection of cross sections of the building in a plurality of planes at regular intervals perpendicular to a certain direction. The three-dimensional data of the building may be data in other formats.

The three-dimensional data of the building may include a reference point and a reference direction of the building. The building placement data is data that can specify the position, height, and orientation of the building in three-dimensional space. The height may be the height from the same reference as the height reference in the ground height data stored in the ground information storage unit 150. The building location data is information that can specify where and in what orientation a building exists in a three-dimensional space. In other words, the building placement data includes the position and location of the building represented by the three-dimensional building data on the ground surface represented by the ground height data stored in the ground information storage unit 150. This is data that can identify the orientation. The building location data may include, for example, data representing the latitude, longitude, and height of the reference point of the building, and the orientation of the reference direction.

In other words, building information is information that can specify the shape, size, position, height, orientation, etc. of a building in a three-dimensional space.

<<Determination unit 120>>
The determination unit 120 receives measurement data from the acquisition unit 110. The determination unit 120 may receive information representing the target range in addition to the measurement data. The determination unit 120 may identify the target range from measurement point information of measurement points included in the measurement data.

The determining unit 120 reads information representing the height of the ground within the target range (that is, ground surface information) from the ground surface information storage unit 150. The determination unit 120 may read the height of the ground at the position indicated by the measurement point information of the measurement point whose measurement data includes information about the height of the ground surface.

The determination unit 120 reads building information of buildings included in the target range from the building information storage unit 160.

The determination unit 120 determines the target range based on the height of the ground surface at the measurement point within the target range, the height of the ground in the target range, and the building information of the buildings included in the target range, which are obtained by measurement. The measurement points within are classified into building measurement points and ground measurement points. In the following description, the height of the ground surface at a measurement point within the target range obtained by measurement will be referred to as a measured value of the height of the ground surface. As described above, the measurement points within the target range are measurement points for which the measurement data received by the determination unit 120 includes information on the height of the ground surface. A building measurement point is a measurement point on the surface of a building. The ground measurement point is a measurement point on the ground that is not on the surface of a building.

The determination unit 120 first calculates the height of the surface of the building within the target range from the ground height of the target range and the building information of the building included in the target range. The determination unit 120 determines, for example, when a building having a shape represented by the building information is placed on the ground in the target range at a position represented by the building information, in a direction represented by the building information, Calculate the height of the building surface. As a result, within the target range, the range where the building exists and the height of the surface of the building in that range are obtained.

For example, the determination unit 120 may select one of the measurement points included in the target range. The selected measurement point is referred to as a target measurement point.

The determination unit 120 may determine whether the position of the target measurement point is included in a range where a building exists.

If the position of the target measurement point is not included in the range where a building exists, the determination unit 120 determines the height of the ground surface of the target measurement point (for example, the most recently measured height of the ground surface); Compare the height of the ground at the target measurement point. If the difference between the measured value of the height of the ground surface at the target measurement point and the height of the ground at the target measurement point is within a predetermined range (hereinafter also referred to as the first predetermined range), the determination unit 120 determines that the height of the ground surface at the target measurement point may be determined to be a ground measurement point. If the difference between the measured value of the height of the ground surface at the target measurement point and the height of the ground at the position of the target measurement point is not within a predetermined range (i.e., the first predetermined range described above), the determination unit 120 The measurement point may be determined to be a noise measurement point that is neither a ground measurement point nor a building measurement point. When a measurement point is a noise measurement point, the measured value of the height of the ground surface at that measurement point can be considered to be noise.

When the position of the target measurement point is included in the range where a building exists, the determination unit 120 compares the measured value of the height of the ground surface with the height of the surface of the building at the position of the measurement point. If the difference between the measured value of the height of the ground surface and the height of the surface of the building at the position of the measurement point is within a predetermined range (hereinafter referred to as a second predetermined range), the determination unit 120 determines that the target measurement The point may be determined to be a building measurement point. The second predetermined range may be the same as the first predetermined range. The second predetermined range may be different from the first predetermined range. The first predetermined range and the second predetermined range may be determined as appropriate. If the difference between the measured value of the height of the ground surface and the height of the building surface at the position of the measurement point is not within the predetermined range (i.e., the second predetermined range described above), the determination unit 120 A point may be determined to be a noise measurement point, which is a measurement point that is neither a ground measurement point nor a building measurement point.

Determining whether a measurement point is a ground measurement point, a building measurement point, or a noise measurement point is performed by classifying the measurement point into a ground measurement point, a building measurement point, or a noise measurement point, and simply , also written as the classification of the target point.

The determination unit 120 selects and selects measurement points included in the target range until all measurement points included in the target range are classified into ground measurement points, building measurement points, and noise measurement points. The classification of measurement points may be repeated.

Information indicating whether a measurement point is a ground measurement point, a building measurement point, or a noise measurement point is referred to as measurement point classification information.

The determination unit 120 sends the measurement data and information on the classification of the measurement points to the noise removal unit 130.

<<Noise removal unit 130>>
The noise removal unit 130 receives measurement data and information on classification of measurement points from the determination unit 120. The noise removal unit 130 removes noise from the measurement data based on the information on the classification of the measurement points. As described above, when a measurement point is a noise measurement point, the measured value of the height of the ground surface at that measurement point, which is included in the measurement data, can be considered to be noise. The measured value of the change in the height of the ground surface at the measurement point, which is included in the measurement data, is a value calculated using the measured value of the height of the ground surface. Therefore, if measurements of the height of the ground surface are considered to be noise, then measurements of changes in the height of the ground surface can be considered to be noise as well. To remove noise from the measurement data, the noise removal unit 130 converts the measured value of the change in the height of the ground surface at the noise measurement point into the measured value of the change in the height of the ground surface at the measurement points surrounding the noise measurement point. make an estimate based on Specifically, the noise removal unit 130 operates, for example, as in the following example.

For example, the noise removal unit 130 determines whether the noise measurement point is included in an area where a building exists. When the noise measurement point is included in an area where a building exists, the noise removal unit 130 measures, for example, a change in the height of the ground surface measured at a building measurement point that exists within a predetermined distance from the noise measurement point. Based on the values, a measured value of the change in ground surface height at the noise measurement point is estimated. The measured value of the estimated change in the height of the ground surface is referred to as the estimated value of the change in the height of the ground surface. Specifically, the noise removal unit 130 converts the above-mentioned statistical value of the measured value of the change in the height of the ground surface measured at the building measurement point existing within a predetermined distance from the noise measurement point to the noise measurement point. It can be used as an estimate of the change in the height of the ground surface.

For example, the noise removal unit 130 calculates the distance between a point where the noise measurement point is projected onto a predetermined plane (for example, a height reference plane or sea level) and a point where the building measurement point is projected onto the same predetermined plane. may be calculated as the distance between the noise measurement point and the building measurement point. If the noise measurement point is included in an area where a building exists, the noise removal unit 130 may, for example, extract a building measurement point on the surface of the same building as the building in which the noise measurement point is included. The noise removal unit 130 may estimate the estimated value of the change in the height of the ground surface at the noise measurement point based on the measured value of the change in the height of the ground surface measured at the extracted building measurement point. good. Specifically, the noise removal unit 130 converts the above-mentioned statistical value of the measured value of the change in the ground surface height measured at the extracted building measurement point into the ground surface height change at the noise measurement point. Good as an estimate of change.

When the noise measurement point is not included in an area where a building exists, the noise removal unit 130 measures, for example, a change in the height of the ground surface measured at a ground measurement point that exists within a predetermined distance from the noise measurement point. Based on the values, an estimate of the change in ground surface height at the noise measurement point may be estimated. Specifically, the noise removal unit 130 converts the above-mentioned statistical value of the measured value of the change in the height of the ground surface measured at the ground measurement point existing within a predetermined distance from the noise measurement point to the above-mentioned statistical value at the noise measurement point. It can be used as an estimate of changes in the height of the ground surface.

The noise removal unit 130 sends the measurement data from which noise has been removed to the output unit 140. The noise removal unit 130 may further send information on classification of measurement points to the output unit 140.

<<Output section 140>>
The output unit 140 receives the measurement data from which noise has been removed from the noise removal unit 130 . The output unit 140 further receives information on classification of measurement points. The output unit 140 sends the measurement data from which noise has been removed to the output destination device 300. The output unit 140 may further send information on the classification of measurement points to the output destination device 300.

For example, the output unit 140 changes the pixel value of each pixel of the map image of the target range to a pixel value corresponding to a change in the height of the ground surface at the corresponding measurement point of the measurement data from which noise has been removed. However, an image of the map of the target range whose pixel values have been changed may be output to the output destination device 300. The map information may be stored in the ground information storage unit 150, for example. The output unit 140 may read information on the map of the target range from the ground information storage unit 150, and generate an image of the map of the target range in which pixel values have been changed based on the read information. The output unit 140 may superimpose a mark indicating information on the classification of the measurement point at a position corresponding to each measurement point on the map representing the target range. The mark indicating the information on the classification of the measurement point may be, for example, a figure such as a circle or a polygon with different colors and shapes. When the output destination device 300 is a display, the output unit 140 may display the generated map image on the output destination device 300.

<<Output destination device 300>>
The output destination device 300 may be, for example, a display. In that case, the output unit 140 may display an image of the generated map, text information representing a change in the height of the ground surface, etc. on the output destination device 300. The output destination device 300 may be, for example, a storage device. In that case, the output unit 140 may store the noise-removed measurement data and information on the classification of the measuring hand in the output destination device 300. The output destination device 300 may be a computer such as a terminal device or a server device. In that case, the output unit 140 may transmit the noise-removed measurement data and information on the classification of the measuring hand to the output destination device 300.

<Operation>
Next, the operation of the measurement data processing device 100 of this embodiment will be described in detail with reference to the drawings.

FIG. 2 is a flowchart illustrating an example of the operation of the measurement data processing device 100 of this embodiment. In the example shown in FIG. 2, the acquisition unit 110 acquires measurement data from the measurement data storage device 200 (step S101). As described above, the measurement data includes measured values of the height of the ground surface and measured values of changes in the height of the ground surface at a plurality of measurement points included in the target range. Next, the determination unit 120 reads ground information from the ground information storage unit 150 (step S102). As described above, the ground surface information is information representing the height of the ground. The determination unit 120 may read information representing the height of the ground at the plurality of measurement points included in the target range. The determination unit 120 further reads building information from the building information storage unit 160 (step S103). The determination unit 120 may read building information of buildings included in the target range. The determination unit 120 classifies the measurement points into building measurement points and ground measurement points based on the ground surface information and building information (step S104). Next, the noise removal unit 130 removes noise from the measurement data based on measurement point classification information representing the result of classifying measurement points into building measurement points and ground measurement points (step S105). Then, the output unit 140 outputs information representing the classification of the measurement points and the measurement data from which noise has been removed to the output destination device 300 (step S106).

<Effect>
The first effect of this embodiment is that it is possible to improve the accuracy of separating measurement points at which the height of the ground surface is observed into measurement points on buildings and measurement points other than buildings. The reason why the first effect occurs is that the determination unit 120 determines whether the measurement point is a ground measurement point that is a measurement point on the ground, based on the information on the height of the ground and the information on the three-dimensional shape of the building. This is because it is determined whether the measurement point is a building measurement point that is a measurement point of a building.

The second effect of this embodiment is that the accuracy of the measured value of the change in the height of the ground surface can be improved. The reason why the second effect occurs is that the noise removal unit 130 converts the measured value of the change in ground surface height at a measurement point determined to be a noise measurement point to This is because the estimation is based on the measured value of the change in surface height. A noise measurement point is a measurement point where the measured value of the height of the ground surface is noise.

<First modification of the first embodiment>
Below, a modification of the first embodiment will be described. First, a first modification of the first embodiment will be described.

In this modification, the determination unit 120 may detect a side surface measurement point existing on the side surface of the building from the building measurement points, and may exclude the detected side surface measurement point from the building measurement points. For example, in the three-dimensional shape of a building, the determination unit 120 detects a surface (hereinafter referred to as a side surface) whose angle with the horizontal plane is included in a predetermined range (for example, an angular width of a predetermined range including 90 degrees). Good too. The determination unit 120 may detect a detected measurement point existing on a side surface among the building measurement points as a side surface measurement point. The determination unit 120 does not need to exclude building measurement points that are included in both the side surface and the surface that is not the side surface from the building measurement points.

<Second modification of the first embodiment>
In the second modification of the first embodiment, similarly to the determination unit 120 of the first embodiment, the determination unit 120 determines that the difference between the measured value of the height of the target measurement point and the height of the ground is If it is included in the first predetermined range, the target measurement point is determined to be a ground measurement point. And, unlike the determining unit 120 of the first embodiment, the determining unit 120 of the present modification determines that the target measurement point is a building if the difference with the ground height is not included in the first predetermined range. Determine it as a measurement point. In other words, the determination unit 120 of this modification does not use building information to classify measurement points.

<Third modification of the first embodiment>
In a third modification of the first embodiment, the building information storage unit 160 stores information on the position on the ground of a structure (for example, an electric cable) whose height measurement value cannot be stably obtained. I remember. A building whose height cannot be stably measured is referred to as an unstable building. An unstable building is, for example, a building whose shape is variable and whose shape changes significantly. An unstable structure is a structure whose height or width cannot be stably measured at an observation point on the structure because the height or width of the structure is small. Unstable structures may be defined as appropriate.

The determination unit 120 selects measurement points whose distance from the unstable building is within a predetermined range and whose difference between the measured height of the ground surface and the ground height is not within the predetermined range as noise. Make it a measurement point. The determining unit 120 determines which of the measurement points whose distance from the unstable building is within a predetermined range, the difference between the measured height of the ground surface and the height of the surface of another building is within a predetermined range. The point may be a building measurement point rather than a noise measurement point.

<Fourth modification of the first embodiment>
In the fourth modification of the first embodiment, the noise removal unit 130 removes noise from the measured value of the change in the height of the ground surface in the measurement data, and also removes noise from the measured value of the height of the ground surface in the measurement data. Performs noise removal. Specifically, the noise removal unit 130 further operates as in the following example, for example.

For example, the noise removal unit 130 determines whether the noise measurement point is included in an area where a building exists. When the noise measurement point is included in an area where a building exists, the noise removal unit 130 applies, for example, the measured value of the height of the ground surface measured at the building measurement point existing within a predetermined distance from the noise measurement point. Based on this, the measured value of the ground surface height at the noise measurement point is estimated. The measured value of the estimated height of the ground surface is referred to as the estimated value of the height of the ground surface. Specifically, the noise removal unit 130 converts the statistical value of the ground surface height measured at the building measurement point existing within a predetermined distance from the noise measurement point into the ground surface height at the noise measurement point. It can be used as an estimate of the The statistical value may be, for example, an average value, an intermediate value, a median value, a mode value, or the like. When the statistical value is the mode, the noise removal unit 130 divides the value range of the ground surface height measurement value measured at the building measurement point existing within a predetermined distance from the noise measurement point by a predetermined number or a predetermined width. may be divided into multiple ranges. The noise removal unit 130 may then identify the range that includes the most measured values of the height of the ground surface. The noise removal unit 130 may use a value representative of the specified range as an estimated value of the height of the ground surface at the noise measurement point. The values representative of the specified range are, for example, the minimum value, median value, maximum value, etc. of the range. A value representative of the specified range may be determined as appropriate.

For example, the noise removal unit 130 calculates the distance between a point projected onto a predetermined plane (for example, a height reference plane or sea level) and a point where a building measurement point is projected onto the same predetermined plane. , may be calculated as the distance between the noise measurement point and the building measurement point.If the noise measurement point is included in an area where a building exists, the noise removal unit 130 may calculate, for example, the distance between the noise measurement point and the building measurement point. A building measurement point on the surface of the same building may be extracted.The noise removal unit 130 extracts the noise measurement point based on the measured value of the height of the ground surface measured at the extracted building measurement point. The noise removal unit 130 may estimate the estimated value of the ground surface height at the extracted building measurement point. The value may be an estimate of the height of the ground surface at the noise measurement point.

If the noise measurement point is not included in an area where a building exists, the noise removal unit 130 applies, for example, the measured value of the height of the ground surface measured at the ground measurement point existing within a predetermined distance from the noise measurement point. Based on this, an estimated value of the height of the ground surface at the noise measurement point may be estimated. Specifically, the noise removal unit 130 converts the above-mentioned statistical value of the measured value of the height of the ground surface measured at the ground measurement point existing within a predetermined distance from the noise measurement point into the ground surface at the noise measurement point. This can be used as an estimate of the height of

<Fifth modification of the first embodiment>
In this modification, the measurement data includes data representing changes in the height of the ground surface and data representing changes in the height of the ground surface.

The data representing changes in the height of the earth's surface may be, for example, data including a plurality of combinations of a value representing height and data representing a time point at which the height was obtained by observation. The unit of data representing a time point may be determined as appropriate. For example, data representing a point in time may represent a date, or may represent a date and time. The unit of time may also be determined as appropriate.

Data representing changes in the height of the ground surface at measurement points on the ground surface will hereinafter be referred to as height change data. The height transition data included in the measurement data is data that has not been subjected to noise removal or the like. The height transition data of the measurement data includes noise and the like.

In other words, in the measurement data, the height transition data may be associated with measurement point information of the measurement point at which the height transition represented by the height transition data was measured. In other words, the measurement data includes measurement point information of a plurality of measurement points and height transition data at each of the plurality of measurement points.

Furthermore, as mentioned above, the change in height is the difference between the measured height of the ground surface at a certain point in time and the measured value of the ground surface height at the point immediately before that point. It's fine. The change in height is the value expressed by the change per predetermined period in the measured value of the ground surface height at a certain point in time from the measured value of the ground surface height at the point immediately before that point. It may be. The predetermined period may be the same as the predetermined period described above. In the following description, a change in the measured value of the height of the ground surface at a certain point in time from the measured value of the height of the ground surface at the point immediately before that point in time is also referred to as a measured value of change in height.

The data representing the transition of changes in the height of the earth's surface is, for example, data that includes multiple combinations of values representing changes in height and data representing the time points at which the changes in height were obtained by observation. good. The unit of the data representing a time point may be the same as the data representing a time point in the data representing changes in the height of the ground surface.

Data representing changes in the height of the ground surface at measurement points on the ground surface will hereinafter be referred to as height change data. The height change transition data included in the measurement data is data that has not been subjected to noise removal or the like. The height change transition data of the measurement data includes noise and the like.

In other words, in the measurement data, the height change transition data may be associated with the measurement point information of the measurement point where the height change transition represented by the height change transition data was measured. In other words, the measurement data includes measurement point information of a plurality of measurement points and height change transition data at each of the plurality of measurement points.

In this modification, the determination unit 120 classifies measurement points at each point in time when the measured value of the height of the ground surface included in the measurement data is measured, similarly to the determination unit 120 of the first embodiment. . Similar to the noise removing unit 130 of the first embodiment, the noise removing unit 130 calculates the height of the ground surface at the noise measurement point every time a measured value of the change in the height of the ground surface included in the measurement data is obtained. Calculate the estimated value of the converted height measurement value.

<Second embodiment>
Next, a second embodiment of the present disclosure will be described in detail with reference to the drawings.

＜＜Configuration＞＞
FIG. 3 is a block diagram showing an example of the configuration of the measurement data processing device 101 of this embodiment.

In the example shown in FIG. 3, the measurement data processing device 101 of this embodiment includes an acquisition section 110 and a determination section 120. The acquisition unit 11 acquires measurement data that is data of the measured value of the height of the ground surface at the measurement point measured by the synthetic aperture radar. The determination unit 120 determines whether the measurement point is a building measurement point, which is a measurement point of a building, or a measurement point other than a building measurement point, based on information on the height of the ground surface obtained in advance. Determine whether it is a certain ground measurement point. The determination method by the determination unit 120 of this embodiment may be the same as the determination method by the determination unit 120 of the first embodiment.

<<Operation>>
FIG. 4 is a flowchart showing an example of the operation of the measurement data processing device 101 of this embodiment. In the example shown in FIG. 4, the acquisition unit 110 acquires measurement data (step S201). Next, the determination unit 120 determines whether the measurement point is a building measurement point or a ground measurement point (step S202).

＜＜Effect＞＞
This embodiment has the same effect as the first effect of the first embodiment. The reason for this is the same as the reason for the first effect of the first embodiment.

<Other embodiments>
The measurement data processing device 100 and the measurement data processing device 101 can be realized by a computer including a memory loaded with a program read from a storage medium and a processor that executes the program. The measurement data processing device 100 and the measurement data processing device 101 can also be realized by dedicated hardware. The measurement data processing device 100 and the measurement data processing device 101 can also be realized by a combination of the above-mentioned computer and dedicated hardware.

FIG. 5 is a diagram illustrating an example of the hardware configuration of a computer 1000 that can implement the measurement data processing device 100 and the measurement data processing device 101. In the example shown in FIG. 5, the computer 1000 includes a processor 1001, a memory 1002, a storage device 1003, and an I/O (Input/Output) interface 1004. Additionally, computer 1000 can access storage medium 1005. The memory 1002 and the storage device 1003 are, for example, a RAM (Random Access Memory), a hard disk, or the like. The storage medium 1005 is, for example, a storage device such as a RAM or a hard disk, a ROM (Read Only Memory), or a portable storage medium. The storage device 1003 may be the storage medium 1005. The processor 1001 can read and write data and programs to and from the memory 1002 and the storage device 1003. The processor 1001 can access, for example, the output destination device 300 via the I/O interface 1004. Processor 1001 can access storage medium 1005. A program that causes the computer 1000 to operate as the measurement data processing device 100 is stored in the storage medium 1005. A program for causing the computer 1000 to operate as the measurement data processing device 101 may be stored in the storage medium 1005.

Processor 1001 loads into memory 1002 a program that causes computer 1000 to operate as measurement data processing apparatus 100, which is stored in storage medium 1005. The computer 1000 operates as the measurement data processing device 100 by the processor 1001 executing the program loaded into the memory 1002.

Similarly, processor 1001 loads into memory 1002 a program that causes computer 1000 to operate as measurement data processing device 101, which is stored in storage medium 1005. The computer 1000 operates as the measurement data processing device 101 by the processor 1001 executing the program loaded into the memory 1002.

The acquisition unit 110, the determination unit 120, the noise removal unit 130, and the output unit 140 can be realized, for example, by the processor 1001 that executes a program loaded into the memory 1002. Furthermore, the ground information storage unit 150 and the building information storage unit 160 can be realized by a memory 1002 included in the computer 1000 or a storage device 1003 such as a hard disk device. Alternatively, part or all of the acquisition section 110, determination section 120, noise removal section 130, output section 140, ground information storage section 150, and building information storage section 160 may be realized by a dedicated circuit that realizes the functions of each section. You can also do that.

Furthermore, part or all of the above embodiments may be described as in the following supplementary notes, but the embodiments are not limited to the following.

(Additional note 1)
acquisition means for acquiring measurement data that is data of the measured value of the height of the ground surface at the measurement point measured by the synthetic aperture radar;
Based on the information on the height of the ground surface obtained in advance, the measurement point is a building measurement point that is a measurement point of a building, or a ground measurement point that is a measurement point other than a building measurement point. a determination means for determining whether there is a
A measurement data processing device comprising:

(Additional note 2)
The measurement data processing device according to supplementary note 1, wherein the determination means performs the determination based on information on the height of the ground surface that includes information on the height of the ground surface that is the ground surface from which a structure has been removed.

(Additional note 3)
The determining means determines the height of the ground surface based on the information on the height of the surface of the building, which further includes information on the height of the surface of the building based on the three-dimensional shape of the building and the arrangement of the building on the ground surface. The measurement data processing device according to Supplementary Note 2 that performs the determination.

(Additional note 4)
The measured data processing device according to any one of Supplementary Notes 1 to 3, further comprising: a noise removing unit that removes noise from the measured data based on the information on the height of the ground surface.

(Appendix 5)
The measurement data includes a measurement value of a change in the height of the ground surface at the measurement point,
The measured data processing device according to appendix 4, wherein the noise removing means removes noise from the measured value of the change in the height of the ground surface from the measured data.

(Appendix 6)
The determination means determines whether or not the measurement point is a side surface measurement point existing on the side surface of a building, and excludes the side surface measurement point from the building measurement points. The measurement data processing device described in .

(Appendix 7)
The determination means determines whether the building measurement point is a specific measurement point whose position and distance from a predetermined type of building satisfy a predetermined standard, and The measurement data processing device according to any one of Supplementary Notes 1 to 6, which is excluded from the building measurement points.

(Appendix 8)
Obtaining measurement data, which is data of the measured value of the height of the ground surface at the measurement point measured by the synthetic aperture radar,
Based on the information on the height of the ground surface obtained in advance, the measurement point is a building measurement point that is a measurement point of a building, or a ground measurement point that is a measurement point other than a building measurement point. determine whether there is
Measurement data processing method.

(Appendix 9)
The measured data processing method according to appendix 8, wherein the determination is made based on information on the height of the ground surface that includes information on the height of the ground surface from which a structure has been removed.

(Appendix 10)
The determination is made based on information on the height of the ground surface that further includes information on the height of the surface of the building based on the three-dimensional shape of the building and the arrangement of the building on the ground surface. Supplementary Note 9 Measurement data processing method described in .

(Appendix 11)
The measured data processing method according to any one of Supplementary Notes 8 to 10, wherein noise is removed from the measured data based on the information on the height of the ground surface.

(Appendix 12)
The measurement data includes a measurement value of a change in the height of the ground surface at the measurement point,
The measured data processing method according to appendix 11, wherein noise is removed from the measured value of the change in the height of the ground surface of the measured data.

(Appendix 13)
The measurement data according to any one of Supplementary Notes 8 to 12, wherein it is determined whether the measurement point is a side measurement point existing on the side of a building, and the side measurement point is excluded from the building measurement points. Processing method.

(Appendix 14)
Determine whether or not the building measurement point is a specific measurement point whose distance from the location of the building measurement point and a predetermined type of building satisfies a predetermined standard, and set the specific measurement point to the building measurement point. The measurement data processing method according to any one of Supplementary Notes 8 to 13.

(Appendix 15)
an acquisition process for acquiring measurement data that is data of the measured value of the height of the ground surface at the measurement point measured by the synthetic aperture radar;
Based on the information on the height of the ground surface obtained in advance, the measurement point is a building measurement point that is a measurement point of a building, or a ground measurement point that is a measurement point other than a building measurement point. a determination process for determining whether there is a
A program that causes a computer to execute.

(Appendix 16)
The program according to appendix 15, wherein the determination process performs the determination based on information on the height of the ground surface that includes information on the height of the ground surface from which a structure has been removed.

(Appendix 17)
The determination process is based on information on the height of the ground surface further including information on the height of the surface of the building based on the three-dimensional shape of the building and the arrangement of the building on the ground surface. The program described in Appendix 16 that performs the determination.

(Appendix 18)
18. The program according to any one of Supplementary Notes 15 to 17, which causes a computer to further perform a noise removal process of removing noise from the measurement data based on the information on the height of the ground surface.

(Appendix 19)
The measurement data includes a measurement value of a change in the height of the ground surface at the measurement point,
The program according to appendix 18, wherein the noise removal process removes noise from the measured value of the change in the height of the ground surface of the measurement data.

(Additional note 20)
The determination process determines whether or not the measurement point is a side surface measurement point existing on the side surface of a building, and excludes the side surface measurement point from the building measurement points. The program described in.

(Additional note 21)
The determination process includes determining whether the building measurement point is a specific measurement point whose distance from the location of the building measurement point and a predetermined type of building satisfies a predetermined standard; The program according to any one of Supplementary Notes 15 to 20, wherein the program is excluded from the building measurement points.

Although the present disclosure has been described above with reference to the embodiments, the present disclosure is not limited to the above embodiments. Various changes can be made to the structure and details of the present disclosure that can be understood by those skilled in the art within the scope of the present disclosure.

This application claims priority based on Japanese Patent Application No. 2020-148283 filed on September 3, 2020, and the entire disclosure thereof is incorporated herein.

1 Measurement data processing system 100 Measurement data processing device 101 Measurement data processing device 110 Acquisition section 120 Judgment section 130 Noise removal section 140 Output section 150 Ground information storage section 160 Building information storage section 200 Measurement data storage device 300 Output destination device 1000 Computer 1001 Processor 1002 Memory 1003 Storage device 1004 I/O interface 1005 Storage medium

Claims (7)

acquisition means for acquiring measurement data that is data of the measured value of the height of the ground surface at the measurement point measured by the synthetic aperture radar;
noise removing means for removing noise from the measurement data based on the information on the height of the ground surface;
Based on the information on the height of the ground surface obtained in advance, the measurement point is a building measurement point that is a measurement point of a building, or a ground measurement point that is a measurement point other than a building measurement point. a determination means for determining whether there is a
Equipped with
The measurement data includes a measurement value of a change in the height of the ground surface at the measurement point,
The noise removal means removes noise from the measured value of the change in the height of the ground surface from the measurement data.
Measurement data processing device. The measurement data processing device according to claim 1, wherein the determination means performs the determination based on information on the height of the ground surface that includes information on the height of the ground surface that is the ground surface from which a structure has been removed. . The determining means determines the height of the ground surface based on the information on the height of the surface of the building, which further includes information on the height of the surface of the building based on the three-dimensional shape of the building and the arrangement of the building on the ground surface. The measurement data processing device according to claim 2, wherein the measurement data processing device makes a determination. The determination means determines whether the building measurement point is a specific measurement point whose position and distance from a predetermined type of building satisfy a predetermined standard, and Judged as noise
The measurement data processing device according to any one of claims 1 to 3 . Obtaining measurement data, which is data of the measured value of the ground surface height at the measurement point measured by the synthetic aperture radar,
removing noise from the measurement data based on the information on the height of the ground surface;
Based on the information on the height of the ground surface obtained in advance, the measurement point is a building measurement point that is a measurement point of a building, or a ground measurement point that is a measurement point other than a building measurement point. Determine whether there is
The measurement data includes a measurement value of a change in the height of the ground surface at the measurement point,
In the noise removal, noise is removed from the measured value of the change in the height of the ground surface of the measurement data.
Measurement data processing method. The measured data processing method according to claim 5 , wherein the determination is made based on information on the height of the ground surface that includes information on the height of the ground surface from which a structure has been removed. an acquisition process for acquiring measurement data that is data of the measured value of the height of the ground surface at the measurement point measured by the synthetic aperture radar;
a noise removal process that removes noise from the measurement data based on the ground surface height information;
Based on the information on the height of the ground surface obtained in advance, the measurement point is a building measurement point that is a measurement point of a building, or a ground measurement point that is a measurement point other than a building measurement point. a determination process for determining whether there is a
make the computer run
The measurement data includes a measurement value of a change in the height of the ground surface at the measurement point,
The noise removal process removes noise from the measurement value of the change in the height of the ground surface of the measurement data.
program.

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