KR101214996B1 - Method for serving and constructing a sea navigation information - Google Patents

Abstract

The present invention relates to a marine geographic information construction and service method that can be used in the construction of marine leisure information such as construction of marine geographic information, navigation system development, real-time tidal information and fishing point information based on the electronic chart, Constructing a relational database of ocean information such as fishing points, reefs and tides; Obtaining a roughness of a standard term and a peripheral term using a predetermined tides table; Extracting tidal information for a standard term from the tides table; Creating a database by writing the extracted tides information into a binary data file; Binarizing the tide information of the standard term and constructing a database by creating a binary data file that can be processed by a computer with the revised and non-harmonic constants of a peripheral term; Transmitting arbitrary digital tides information for the standard term or the peripheral term contained in the database at the request of a predetermined mobile terminal; Calculating, by the portable terminal, the tides and tides at any time using the transmitted digital tides information; And expressing the calculated tides and the elevation information in a graph on a screen.

Description

METHOD FOR SERVING AND CONSTRUCTING A SEA NAVIGATION INFORMATION}

1 is a theoretical model showing the configuration of a general electronic chart file.

It is a physical model of the structure of the electronic chart file of FIG.

3 is a block diagram showing a general electronic chart system.

4 is a diagram illustrating a relation of inclusion between general objects.

5 is a diagram illustrating a general data model.

6 is a diagram illustrating a general vector model.

7 is a diagram illustrating a general method of representing spatial information.

8 to 10 are diagrams for explaining the marine geographic information construction and service method according to the present invention.

11 is a sequence diagram for system initialization applied to the present invention.

12 is a diagram illustrating a symbol instruction extraction method according to the present invention.

13 is a flowchart illustrating a screen display concept according to the present invention.

Figure 14 is a diagram implemented by the store manager, orthogonal method class according to the present invention.

15 is a view showing a composite line drawn by the line symbol according to the present invention.

16 is a view showing the configuration of the marine leisure portal system applied to the present invention.

17 is a diagram illustrating the configuration of ship navigation information on a web applied to the present invention.

18 is a view illustrating a basic function of the marine leisure navigation applied to the present invention.

19 is a tidal information output screen of the PC applied to the present invention.

20 is a tide information representation graph according to the present invention.

21 is a view showing fishing point information according to the present invention.

The present invention relates to a marine geographic information construction service, and in particular, it is possible to construct marine leisure information such as construction of marine geographic information, navigation system development, real-time tidal information, and fishing point information based on electronic charts, which can be utilized in a PDA. Geographic information construction and service methods.

The electronic sea chart is a new navigation equipment that has emerged thanks to digital technology. It is a new concept of navigation equipment that not only visually expresses the paper chart but also provides geographical information and navigation information.

The Electronic Navigation Chart is an official vector data published by national waterway bureaus and consists of spatial information and attribute information for representing objects represented in the form of points, lines, and faces.

International standards for electronic charts are prepared by the International Hydrographic Office (IHO), and the standard documents are S-52 (Specification for Chart Content and Display Aspects of ECDIS) and S-57 (IHO Transfer Standard for Digital Hydrographic Data). There is this. Currently, Korea has published electronic charts of 210 maps corresponding to paper charts and is used for the Electronic Chart Display and Information System (ECDIS).

In the case of car navigation, the maps produced by the map makers are used by licenses per copy by the navigation software makers, and in some cases, the map makers produce the navigation software.

Marine leisure navigation including car maps, marine geographic information, and marine leisure information has not been developed, and new markets are expected to be created due to the increase of marine leisure activities. Maritime leisure navigation is expected to contribute to ensuring safety at sea as well as leisure activities.

Fig. 1 is a theoretical model showing the structure of a general electronic chart file. The electronic chart is a digital map similar to a paper chart, and is official data produced by waterway stations of each country.

The electronic chart is composed of spatial information and attribute information according to S-57, which is the international channel data exchange standard, and the electronic chart consists of records, fields, and subfields as in the physical model of the electronic chart file of FIG. do.

The electronic chart is supplied in the form of data in Cell units divided by latitude and longitude for efficient processing of data, and its size should not exceed 5Mbytes. In the former, the data uses a chain-node topology, and the curves use edges and connected nodes.

S-57 is a theory of modeling spatial information, and in order to produce electronic charts, national waterways should follow the specifications of electronic charts. When manufacturing electronic charts, the electronic chart production specifications should be followed and only the objects and attribute values defined in the production specifications should be used. The coordinate reference of the chart is that the WGS-84 horizontal datum is used and no projection is used to store the position information. The location information uses a latitude and longitude coordinate system, the depth is in meters, and the sea distance is in nautical miles.

In addition, ECDIS is a new concept of navigation equipment that can replace paper charts as an electronic chart system. The electronic chart system uses electronic charts and provides information on safety navigation in addition to geographic information. In addition, the electronic chart system operates as a core device of the comprehensive navigation system in connection with external navigation equipment such as GPS, speed log, and radar. The configuration of the electronic chart system is as shown in FIG.

According to the performance specifications set by the International Maritime Organization (IMO), the electronic chart system should have the functions of Route Planning & Monitoring, Chart query & updating Radar Overlay. You should be able to read the Raster charts produced by the UK DRA for use in waters.

That is, the International Maritime Organization (IMO) defines general performance criteria related to ECDIS, and the International Hydrographic Organization (IHO) is concerned with the transmission of digital channel data (S-57) and the contents and indications of ECDIS (S-52). Are listed. Basically, ECDIS supports traditional tasks related to paper charts, such as navigation calculations, chart updating, route planning, and route monitoring.In addition to the above functions, the Sensor Interface, danger alarm function, and Mark function Includes additional features such as logging, simulation, and simulation.

ECDIS is a new concept of navigational equipment that combines geographical and navigational information, not just a visual representation of paper charts. Electronic charts are authorized vector data used in ECDIS and consist of spatial information and attribute information to represent objects represented in the form of points, lines, and faces. International standards for electronic charts are prepared by the IHO and include S-52 and S-57 as standard documents.

Table 1 below is categorized according to the purpose of navigation and can be divided by the scale of total map, harbor map, coast map, port approach map, harbor map and harbor map.

Code No. Chart division Scale One  Overview Chart <500,000 2  General Chart 100,000 to 499,999 3  Coastal Chart 50,000 ～ 99,999 4  Approach Chart 25,000 ～ 49,999 5  Harbor Chart 3,000 ～ 24,999 6  Berthing Chart > 2,999

S-57 was established in December 1996 as an exchange standard established by the IHO for the exchange of waterway data between waterways, as well as for ECDIS producers, navigators and other users. After revising to 3, it has been decided not to change for the next four years until now. S-52 is a standard for the contents and representation of chart data. Revised to 3. Since the S-57 exchange standard is not suitable as an internal structure for computer screen display, the IHO recommends converting it into an efficient internal data structure. The screen display method is also defined in detail in the PL document, S-52. The implementation is also left to the ECDIS producer.

As a result, each ECDIS has a difference in performance according to data structure and processing algorithm for storing the electronic chart. Implementing an efficient data structure and processing algorithm is an important factor to satisfy the ECDIS performance specification prescribed by IMO.

Electronic charts are numbered after their manufacture and have a basic format, such as "AABCCCC.000". Here, the first "AA" part represents Korea (KP) as the electronic chart production country code, and other countries include Japan JP, US US, UK AE, Germany DE, France FR, Canada CA, China CN, Russia RU. .

The next "B" is a code number for each navigational purpose of the electronic chart, which is assigned one of numbers 1 to 6. For example, an island with a scale of 1 / 50,000 is a coastal island with a designation number three.

Next, the five-digit "CCCCC" is a cell code set by each country, and Korea uses the existing paper code number from the National Maritime Research Institute. The number of paper islands is assigned to 101-199 in the east coast, 201-299 in the south coast, 301-399 in the west coast, 400-499 in the special coast, 501-599 in the Japanese coast, and 801-989 in the Pacific and Southeast Asia. The electronic chart number, that is, the electronic chart file name is assigned internationally. Therefore, the electronic chart number must be assigned accordingly.

For example, in the case of chart number 201, 20100 is assigned. Finally, the extension "000" is an electronic chart update number, and the first edition is marked as 000 and the first edition 001, and the number is increased by one each time there is a continuous update. In other words, when the scale of Busan port with the sea chart number 201 is produced for the first time, the electronic chart file name is "KP520100.000".

In 1989, IHO established the Electronic Charting Committee, and the results of each country's research on the technical review, test operation, and international standard establishment for the practical use of the electronic charts were completed and published in 1996, which promoted the development of electronic charts in each country. Became more noticeable. In Korea, the National Maritime Research Institute has completed the electronic chart development project from 1995 to 1999 with the participation of research institutes and industry. In order to maintain up-to-date navigation safety information, 210 new types of electronic charts are produced each year, and currently, weekly navigational notices are produced as updated files.

The IHO S-57 is a vector format based on the S-57 object model that is related to chart contents and display form on ECDIS, and refers to 'IHO TRANSFER STANDARD for DIGITAL HYDROGRAPHIC DATA' created by the International Maritime Organization. The third edition was published monthly, and amendments were banned for the next four years. S-57 contains a description of the theoretical data model used to model chart data, and a description of the data structure used to represent the data. The model defines channel-related information as a combination of attributes consisting of object descriptions and geometrical characteristics. In this model, an object is defined by dividing it into attribute information and related spatial information.

In attribute information, only conceptual features of each object are defined in a prescribed format, and spatial information is represented as a vector having coordinate values composed of points, lines, and planes to concretely shape such objects.

One cell contains the boundaries of the geographic range that the cell contains and its intended use in the S-57 electronic chart. One cell is defined by two meridian (vertical lines) and two latitude lines (parallel lines), and the data contained in one cell cannot exceed 5 Mbytes.

Chart data in the S-57 format can generally be generated from paper or raster navigation charts (RNC) or directly from survey data.

The main purpose of this globally defined standard data is to digitally replace the existing paper islands used for navigation. S-57 is an exchange standard established by the IHO for the exchange of waterway data between national waterways, as well as for ECDIS producers, navigators and other users. S-52 is a standard for the contents and representation of sea chart data. In November Ed. Revised to 5.

ISO / IEC 8211 (ISO; International Organization for Standardization / IEC; International Electro-technical Commission) is a data exchange standard that enables the exchange of structured data regardless of the type of computer. S-57 uses this regulation and therefore electronic chart data should also be produced using ISO / IEC 8211.

S-57 theoretically suggests how to represent real-world objects and allows them to be represented in data structures. In order to use it in the actual application system, there should be a separate related rule designed for the application system. The electronic chart is made to use the S-57 data as the chart. In other words, among the various methods that can be expressed in S-57, some of them are selectively used.

The theoretical model used to represent the real-world object in the data structure in S-57 can be expressed as shown in FIG. In S-57, all real-world objects to be expressed are expressed using one or more attribute information and corresponding spatial information. Here, the attribute information may exist regardless of the presence or absence of the spatial information, but the spatial information must be related to the attribute information. In other words, S-57 means that spatial information must have an associated attribute. This is directly related to the problem of how to express the data in the process of actually using the data composed of S-57.

S-57 data model

The data standard is designed with transformations representing the real world, and consists of attribute information objects and spatial information objects. Attribute information and spatial information are represented as attribute objects and spatial objects in the S-57 standard as shown in FIG.

The attribute objects are classified into Meta (information on other objects), Cartographic (information related to cartography), Geo (information describing characteristics in the real world), and Collection (prescribes relationships between objects).

In addition, the spatial objects are classified into a vector model, a raster model, and a matrix model, but currently only the vector model shown in FIG. 6 is defined.

In order to define the topological relationship between objects when expressing objects using the above objects, S-57 specifies that each object has the following relationship.

There are four phase relations that can be used in S-57.

First, Cartographic Spaghetti: consists of an Isolated node and an Edge, which does not refer to any node.

Second, Chain-node: It is composed of Isolated, Connected node and Edge. Edge is composed using Connected node. Edges can cross each other.

Third, Planar Graph: It has the same structure as Chain-node, but Edge cannot cross and always use Connected Node.

Fourth, Full Topology: It has the same structure as Planar Graph and uses an object called Face.

■ S-57 data structure

Theoretical data models for describing the real world are represented by data that can be exchanged through data structures.

The structure of the S-57 data can be summarized in the following sentence.

? Exchange file consists of one or more files

? One file consists of one or more records

? One record consists of one or more fields

? One field consists of one or more subfields

■ Real world representation of S-57

S-57 expresses real-world objects with attributes and spatial information.

(1) Attribute Information

The attribute information of an object has an identifier for identifying the object, topographical attributes of points, lines, and faces, and information that can distinguish the object uniquely from the world and corresponding attribute information. Attribute information should only be used in the table of contents set by the IHO. In addition, the attribute information includes such matters as a relationship between objects (Master-Slave), a pointer to a reference spatial information, and an attribute value for a multinational language.

The attribute information indicates that the reference should be made in a certain order when referring to spatial information. If the reference order is designated as Forward, it is referred to in the order of 1-2-3-4, and if it is reversed, the reverse reference is made. You can also specify whether to show segments between nodes.

(2) Spatial Information

The spatial information has an identifier and an attribute value necessary for the spatial information so that the attribute information can be referred to.

The spatial information representation of S-57 is summarized in the following FIG. 7 is a diagram illustrating all elements corresponding to the four phase relationships, and the format of the reference is as follows.

? Isolated Node: See the contained Face

? Edge: Refers to the start and end nodes and the left and right faces

? Face: Refers to Edge and includes reference direction, inner and outer boundaries, and masking.

Accordingly, an object of the present invention is to build marine geographic information based on the electronic chart, navigation system development, marine leisure information such as real-time tidal information and fishing point information, which can be utilized in the PDA and geo geographic information construction and service method To provide.

The technical method of the present invention for achieving the above object comprises the steps of constructing the marine information such as fishing point, reef and tidal information into a relational database; Obtaining a roughness of a standard term and a peripheral term using a predetermined tides table; Extracting tidal information for a standard term from the tides table; Creating a database by writing the extracted tides information into a binary data file; Binarizing the tide information of the standard term and constructing a database by creating a binary data file that can be processed by a computer with the revised and non-harmonic constants of a peripheral term; Transmitting arbitrary digital tides information for the standard term or the peripheral term contained in the database at the request of a predetermined mobile terminal; Calculating, by the portable terminal, the tides and tides at any time using the transmitted digital tides information; And expressing the calculated tides and the elevation information in a graph on the screen.

Specifically, the marine information includes meta information, spatial information and attribute information, and the binary data file constructed with the database is characterized by consisting of spatial information and attribute information.

In addition, the tide table is composed of a date, high time, high height, low time, low height, the format of the binary data file, approximately 8 bytes, high low speed 1 byte, high time 1 byte, high height 1 It consists of a byte, low light time 1 byte, and low light height 1 byte.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

8 to 10 illustrate a method for constructing and servicing marine geographic information according to the present invention. The method includes constructing a marine information such as fishing point, fish and tidal information into a relational database, and using a predetermined tidal table. Obtaining tides of standard terms and surrounding terms, extracting tides information for standard terms from the tides table, creating a database by extracting the extracted tides information into a binary data file, and tides information of the standard terms. After binarization, the revised and non-harmonic constants of the neighboring terms are made into a binary data file that can be processed by a computer, and then constructed as a database. Transmitting the digital tides information, and the mobile terminal transmits the digital tides The information consists of calculating a tidal and Zhao Gao any time, and the step of representing the calculated tidal and Zhao Gao information graphically on a screen used.

The marine information includes meta information, spatial information, and attribution information, and the binary data file constructed with the database includes spatial information and attribution information, and the tides table includes: date, elevation time, elevation height, It consists of low time and low height.

The binary data file is composed of approximately 8 bytes of date, 1 byte of high low speed, 1 byte of high time, 1 byte of high height, 1 byte of low time, and 1 byte of low height.

An object of the present invention is to build marine geographic information based on the electronic chart, navigation system development, marine leisure information such as real-time tidal information and fishing point information to provide marine geographic information construction and services that can be utilized in PDA There is.

(1) Electronic Chart Representation System for PDA

end. Files and Structures to Be Processed

The file types to be processed include a data set with a * .000 extension, an object catalog (file name: objcatv3.dic) with an extension of * .dic, a property catalog (file name: atrcatv3.dic), a symbol instruction (Symbology Instruction), There is a PL (file name: Prslib03.dai) with an extension of * .dai that includes a color table and a lookup table.

For the representation of the S-57 data (hereinafter referred to as the above), the Object Catalog, the Attribute Catalog and the PL containing the definitions of the objects and their attributes must be read in advance at the beginning of the program. A sequence diagram for system initialization is shown in FIG.

There are four types of electronic charts: new data set, update, re-issue of a data set, and new edition of a data set. The present invention deals only with data sets having an extension of * .000 except for update.

Table 2 below shows the record and field structure of the electronic chart.

Class implementations for these materials are described below.

Data set general information record data set identification data set structure information Data set geographic reference record data set parameter Vector record ATTV VRPT SG2D SG3D Feature record FOID ATTF NATF FFPT FSPT

I. Display

In order to express each object and property, necessary information is extracted from the object catalog and property catalog and the appropriate symbol instruction (Symbology Instruction) is extracted from the lookup table as shown in FIG.

Symbol commands contain various symbols such as conditional symbology, complex line, and centered symbol. Implementing this depends on the Display Generator Concept proposed by PL. The following section describes the actual implementation of the algorithm by applying these display concepts.

When redrawing the screen, as mentioned, CGeoSurface's Paint () function is called. Paint () calls the drawing function of the layer it belongs to, and each layer calls the drawing function of CSurfaceObj belonging to each layer.

The minimum accumulation (Scalemin) of the properties of the object obtained is compared with the current accumulation. If the minimum accumulation is less than the current accumulation, the display method selects the traditional symbol command or the simplified symbol command. After checking the spatial coordinates of the object to see if it exists within the drawing range, the symbol command is retrieved from the Lookup Table. Run the appropriate drawing command according to the symbol command. 13 shows a screen display concept as a flowchart.

All. Coordinate system

C-1. Surface coordinate system

The coordinate system of the geographic surface for expressing the electronic chart proposed by the present invention is called a surface coordinate system.

This coordinate system uses 1 / 1500th of a WGS84 datum in units of 1 Surface, which is called 1 SurfaceUnit. The resolution of the geometric plane for the display is 360 (degrees) * 60 (minutes) * 60 (seconds) * 1500, and the coordinate system is the value that increases to the right and the value increases to the right with the origin as 0 degrees latitude and 0 degrees latitude. .

A function is provided to convert SurfaceUnit into the appropriate metrology according to metric and yardage methods. WGS84 spatial coordinates of the electronic chart are converted into SurfaceUnit and stored in the system.

C-2. Screen coordinate system

The screen coordinate system is set to (0, 0) in the center of the screen, the unit is 0.01 mm, and the x axis increases to the right and the y axis increases downward.

C-3. Projection

The projection of SurfaceUnit and the screen coordinate system is implemented through the coordinate transformation functions of the point manager method (implemented by the CMercatorPrj class) and the orthogonal method (implemented by the CorthographicPrj class), which are inherited from the abstract class CPrjModel. The accumulation is calculated as the ratio of the distance on the screen to the actual distance. 14 shows a class diagram.

la. Main symbol command

D-1. Conditional Symbology

This is a symbol command for a symbol whose expression is changed according to a user's input. Table 3 shows the global variables that store the choices.

Variable name Contents Variable type SAFETY_DEPTH Depth setting single SHALLOW_CONTOUR Low water line setting single SAFETY_CONTOUR Safety Depth Line Setting single DEEP_CONTOUR High Water Line Settings single TWO_SHADES Whether to use two depth colors boolean SHALLOW_PATTERN Low water emphasis boolean SHIPS_OUTLINE Ship symbol boolean DISTANCE_TAGS Distance tag spacing single TIME_TAGS Time tag interval single FULL_SECTORS Whether light distance is displayed boolean

D-2. Complex Line

In the form of drawing a line, it means to draw a symbol rather than a straight line. In the case of FIG. 15, an anchor symbol for representing anchorage should be drawn in the shape of a line on the upper right side of the screen.

D-3 Centered Symbol

When drawing multiple symbols at the same place at the same time, to prevent the screen from becoming complicated, define a central symbol so that other symbols can be placed around it.

Also, if the symbol is in an area (eg anchor symbol in anchorage), the symbol should always be in the center of the area, even if the screen scrolls up, down, left, or right. This symbol is called a central symbol.

In this manner, an electronic representation system for a PDA can be implemented.

(2) Marine leisure portal site for maritime leisure information transmission

Based on the digital chart of the digital sea chart, it provides island travel information, fishing information, tides information, etc., and establishes a marine leisure portal that can provide services such as homestay reservation system and leisure boat (fishing boat and yacht) reservation. . It is developed to download safety and leisure information such as ship navigation information, tidal information, fishing point information, etc. by connecting to PDA through portable Internet.

FIG. 16 is a diagram illustrating the structure of the marine leisure portal system, FIG. 17 is a diagram illustrating the structure of ship navigation information on the web, and FIG. 18 is a diagram illustrating the basic functions of maritime leisure navigation.

(3) real-time tides information system

The tide table shows the daily high and low times, high and low currents, the strongest currents, and the flow velocity of 44 major ports and 14 major narrow channels along the coast of Korea. The National Maritime Research Institute estimated and recorded the respective forecast values. In recent years, as tidal phenomena occurring in the sea are recognized as an important part of people's real life such as weather prevention, disaster prevention, marine industry, and marine leisure activities, it is important to develop a system that can obtain such tidal information in real time. Do.

In the present invention, the information recorded in the tide table is built as a database on the basis of the tide table, so that it can be built in a PDA or downloaded from an Internet server. That is, when a certain point is clicked on the electronic chart as shown in FIG. 19, the tide information can be output in the form of a graph.

end. Development of real time tides information system

Tide information is constructed from the DB by extracting the contents from the tide table. The tide table is published on a yearly basis. One year's worth of information can all be provided as a DB, or a DB can be built on a web server and downloaded in real time over the Internet.

I. Marine leisure information DB construction

Fishing points, etc. retrieve information from the Internet to build a DB. Since this is dynamic information, it is downloaded from the Internet in real time.

The basic functions of the marine leisure portal site are shown in Table 4 below.

Classification service Location-based information
service  Island service, island, lighthouse search  Wireless GIS for Providing Adjacent Sea Area Information  Traffic Information Service  Travel Guide, Private Navigation (Fishing Leisure) Navigation / Tracking
service  Optimum route calculation, navigation calculation  Fleet Control (Ship Location Report)  Corporate Internet, Intranet Location-based
Commerce  Mobile ecommerce Additional services, such as comparison fishing reservations and bed and breakfast reservations based on your location  Location-based advertising service (fishing and island travel information provided)  CRM based on location Public Service  Public service such as rescue request, crime report, response to disaster  Weather Forecast (Tide, Algae, Fargo)  Red tide management, coastal traffic management

In other words, the present invention extracts the main marine geographic information such as land, island, depth area, buoy, traffic divider from the electronic chart of S-57 format and converts it into a data structure suitable for PDA.

In the present invention, as shown in FIG. 8, a method of converting a digital file recordable on a storage medium in advance and storing the same on a memory card is used.

In addition, the present invention is characterized in that the storage capacity may be small and the display speed is high because the storage is performed without the record field structure during the conversion process.

Marine leisure information refers to fishing point information, fish reef information, tides information. Fishing point information, fish information and the like can be stored in a relational DB.

Tide information can be obtained from the tide table using the tide table to find the height of the standard port and neighboring ports.

Tide tables can be used to find the low and low times at any time in the standard and surrounding ports. The method for obtaining tidal information in real time from a PC, a portable terminal, a PDA, etc. using the tides table, extracts tidal information for a standard term from the tidal table, creates a binary data file, and converts the revised and non-harmonic constants of the surrounding term into binary. Write to data file.

And using this to calculate the tides and tides at any time, the calculation method is already known in the tide table, the present invention relates to a method for computerizing such a known method.

Standard tide information, neighboring port revision number and non-harmonic constant are created as a binary data file that can be processed by a computer, and the calculated information is represented as a graph.

If marine leisure information is updated, the information should be downloaded via wired or wireless Internet.

Tide tables are published once a year, so a new binary data file must be produced and downloaded every year.

While specific embodiments of the invention have been described and shown above, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Such modified embodiments should not be understood individually from the technical idea and viewpoint of the present invention, but should be regarded as belonging to the claims attached hereto.

Therefore, in the present invention, when constructing marine geographic information based on the electronic chart, navigation system development, marine leisure information such as real-time tidal information and fishing point information, it is converted into a digital file that can be recorded on a storage medium in advance. If the data is downloaded to a portable terminal such as a PDA by selecting a construction or storing and using in a memory card, there is an advantage of increasing transmission efficiency.

In addition, since the recording field is stored without the record field structure in the process of converting to digital data, the storage capacity of marine geographic information may be small and the display speed of various marine geographic information may be high.

Claims (5)

Constructing marine information, such as fishing points, reefs and tides, into a relational database; Obtaining a roughness of a standard term and a peripheral term using a predetermined tides table; Extracting tidal information for a standard term from the tides table; Creating a database by writing the extracted tides information into a binary data file; Binarizing the tide information of the standard term and constructing a database by creating a binary data file that can be processed by a computer with the revised and non-harmonic constants of a peripheral term; Transmitting arbitrary digital tides information for the standard term or the peripheral term contained in the database at the request of a predetermined mobile terminal; Calculating, by the portable terminal, the tides and tides at any time using the transmitted digital tides information; And And expressing the calculated tides and the elevation information in a graph on the screen. Expressing objects and attributes based on the electronic chart on the screen; Expressing objects and attributes based on the electronic chart, A system initialization step of previously reading a PL including an object catalog and an attribute catalog representing objects and attributes of the electronic chart, and a symbol instruction word, a color table, and a lookup table extracted from the object catalog and an attribute catalog; Comparing a minimum accumulation of attributes of the object with a current accumulation; Selecting a symbol command if the minimum accumulation is less than the current accumulation; A boundary inspection step of examining whether the object exists within a drawing range by examining the spatial coordinates of the object; And Importing a symbol command from the lookup table of the PL, and executing a drawing command according to the symbol command; The constructing step of the database, marine geographic information construction and service method characterized in that to store only the sub-fields of the electronic file in the process of creating a binary data file. The method according to claim 1, The marine information, marine geographic information construction and service method comprising the meta information, spatial information and attribute information. The method according to claim 1, The binary data file constructed as the database comprises spatial information and attribute information. The method according to claim 1, The tide table, date, high tide time, high tide height, low tide time, low tide height marine geographic information construction and service method characterized in that. The method according to claim 1, The format of the binary data file is a date of 8 bytes, high low speed 1 byte, high time 1 byte, high height 1 byte, low time 1 byte, and low height 1 byte. Way.

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