CN114297324A - Coordinate conversion method, equipment, medium and product of geographic data - Google Patents
Coordinate conversion method, equipment, medium and product of geographic data Download PDFInfo
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Abstract
The invention provides a coordinate conversion method of geographic data, which comprises the steps of obtaining grid data of an area to be converted, parameter coding, generating current parameter information, determining grid point coding and converting coordinates. According to the coordinate conversion method of the geographic data, the current parameter information of the four grid end points corresponding to each point to be converted can be rapidly and accurately screened out, so that the efficiency of converting the point to be converted from an original coordinate system to a target coordinate system is improved, and the accuracy of coordinate conversion is improved.
Description
Technical Field
The present invention relates to the field of geographic data processing, and in particular, to a method, device, medium, and product for converting coordinates of geographic data.
Background
In recent years, the specification of the coordinate system is updated at variable times in the geospatial data of the national and local resources of the whole province, so that the whole geospatial data can be displayed by unifying a new coordinate system, and therefore, provincial, municipal and county-level national resource governing departments need to convert the pre-stored stock data in the original coordinate system into a new coordinate system (namely, a target coordinate system).
In the actual geographic data coordinate transformation work, most commonly used are boolean sa model transformation, seven parameter model transformation, four parameter model transformation, and map correction amount transformation in the grid method, which have the highest accuracy of map correction amount transformation. However, in the current map frame correction conversion process, it is difficult to determine the parameter information of the grid end points corresponding to the points to be converted in the map frame to be converted, and the points to be converted need to be compared with each grid end point, thereby greatly reducing the efficiency of coordinate conversion.
Disclosure of Invention
In order to overcome the defects of the prior art, an object of the present invention is to provide a coordinate transformation method for geographic data, which can solve the problem that it is difficult to determine the parameter information of the grid end points corresponding to the points to be transformed in the image to be transformed in the current image correction transformation process, and the points to be transformed need to be compared with each grid end point, thereby greatly reducing the efficiency of coordinate transformation.
The second objective of the present invention is to provide an electronic device, which can solve the problem that it is difficult to determine the parameter information of the grid end points corresponding to the points to be converted in the image to be converted in the current image correction conversion process, and the points to be converted need to be compared with each grid end point, thereby greatly reducing the efficiency of coordinate conversion.
The invention also provides a computer-readable storage medium, which can solve the problem that in the current map sheet correction conversion process, it is difficult to determine the parameter information of the corresponding grid end point of the point to be converted in the map sheet to be converted, and the point to be converted needs to be compared with each grid end point, thereby greatly reducing the efficiency of coordinate conversion.
The fourth objective of the present invention is to provide a computer program product, which can solve the problem that it is difficult to determine the parameter information of the grid end points corresponding to the points to be converted in the image to be converted in the current image correction conversion process, and the efficiency of coordinate conversion is greatly reduced because the points to be converted need to be compared with each grid end point.
One of the purposes of the invention is realized by adopting the following technical scheme:
a coordinate transformation method of geographic data, comprising the steps of:
obtaining grid data of a region to be converted, and obtaining grid data of the region to be converted corresponding to the region to be converted in original coordinates, wherein the grid data of the region to be converted is original parameter information corresponding to each grid end point after the region to be converted is equally divided into a plurality of grid units containing four grid end points, and the original parameter information comprises longitude and latitude information and longitude and latitude correction information corresponding to a target coordinate system;
parameter coding, namely selecting any grid end point as a coding reference initial grid end point, setting grid point codes for the coding reference initial grid end point, and setting grid point codes corresponding to all the residual grid end points according to the distances between different grid end points and the coding reference initial grid points and the grid point codes corresponding to the coding reference initial grid end points;
generating current parameter information, storing the grid point code corresponding to each grid end point into the original parameter information, obtaining and storing the current parameter information corresponding to each grid end point;
determining grid point codes, determining corresponding grid units from grid data of an area to be converted according to original longitude and latitude information corresponding to each point to be converted in the area to be converted, and determining grid point codes corresponding to four grid end points in the grid units according to the original longitude and latitude information corresponding to the point to be converted and longitude and latitude information corresponding to the code reference starting grid end point;
and coordinate conversion, namely screening out the current parameter information of the four grid end points corresponding to each point to be converted according to the grid point codes, and converting each point to be converted in the area to be converted into a target coordinate system according to a preset bilinear interpolation function, the original longitude and latitude information of each point to be converted and the current parameter information of the four grid end points corresponding to each point to be converted.
Further, determining the grid point codes corresponding to the four grid end points in the grid unit according to the original longitude and latitude information corresponding to the point to be converted and the longitude and latitude information corresponding to the code reference initial grid end point specifically includes: and determining grid point codes of grid end points positioned at a preset position in the grid unit according to the numerical relationship between the original longitude and latitude information corresponding to the point to be converted and the longitude and latitude information corresponding to the code reference starting grid end point, and determining grid point codes of the remaining three grid end points in the grid unit according to the grid point codes of the grid end points positioned at the preset position.
Further, the lattice point code includes a longitude code and a latitude code.
Furthermore, the latitude difference values of two adjacent grid endpoints with the same longitude are equal, the longitude difference values of two adjacent grid endpoints with the same latitude are equal, a longitude code corresponding to each grid endpoint is set according to the longitude difference value between the different grid endpoint and the encoded reference starting grid point and the longitude code corresponding to the encoded reference starting grid endpoint, and a latitude code corresponding to each grid endpoint is set according to the latitude difference information between the different grid endpoint and the encoded reference starting grid point and the latitude code corresponding to the encoded reference starting grid endpoint.
Further, the coordinate transformation specifically further includes the following substeps:
calculating conversion correction quantity, screening out the current parameter information of four grid end points corresponding to each point to be converted according to the grid point codes, and inputting the original longitude and latitude information of each point to be converted and the current parameter information of the four grid end points corresponding to each point to be converted into a preset bilinear interpolation function to obtain the conversion correction quantity corresponding to each point to be converted;
and coordinate conversion, namely correcting the original longitude and latitude information corresponding to the point to be converted according to the conversion correction quantity to obtain the current longitude and latitude information of the point to be converted in a target coordinate system.
Further, the conversion correction amount includes a longitude correction amount and a latitude correction amount, the original longitude and latitude information includes an original longitude numerical value and an original latitude numerical value, and the coordinate conversion specifically includes: and correcting the original longitude value of the point to be converted according to the longitude correction amount and obtaining the current longitude value of the point to be converted in a target coordinate system, and correcting the original latitude value of the point to be converted according to the latitude correction amount and obtaining the current latitude value of the point to be converted in the target coordinate system, so that current longitude and latitude information containing the current longitude value and the current latitude value is obtained.
The second purpose of the invention is realized by adopting the following technical scheme:
an electronic device, comprising: a processor;
a memory; and a program, wherein the program is stored in the memory and configured to be executed by the processor, the program comprising a coordinate transformation method for executing one of the geographic data described in the present application.
The third purpose of the invention is realized by adopting the following technical scheme:
a computer-readable storage medium, on which a computer program is stored, which is executed by a processor to perform a coordinate transformation method of geographical data as described in the present application.
The fourth purpose of the invention is realized by adopting the following technical scheme:
a computer program product comprising a computer program which, when executed by a processor, implements a method of coordinate transformation of geographical data as described in the present application.
Compared with the prior art, the invention has the beneficial effects that: a coordinate conversion method of geographic data in the application, by choosing any grid end point as the encoding reference initial grid end point, setting grid point codes for the encoding reference initial grid end point, setting grid point codes corresponding to the remaining grid end points according to the distances between different grid end points and the encoding reference initial grid point and the grid point codes corresponding to the encoding reference initial grid end point, storing the grid point codes corresponding to each grid end point into the original parameter information, obtaining and storing the current parameter information corresponding to each grid end point, determining the corresponding grid unit from the grid data of the area to be converted according to the original longitude and latitude information corresponding to each grid end point to be converted, determining the grid point codes corresponding to four grid end points in the grid unit according to the original longitude and latitude information corresponding to the original grid end point to be converted and the longitude and latitude information corresponding to the encoding reference initial grid end point, the current parameter information of the four grid end points corresponding to each point to be converted can be rapidly and accurately screened out, so that the efficiency of converting the point to be converted from an original coordinate system to a target coordinate system is improved, and the accuracy of coordinate conversion is improved.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic flow chart of a coordinate transformation method for geographic data according to the present invention;
FIG. 2 is a schematic diagram of grid endpoints in a coordinate transformation method for geographic data according to the present invention;
FIG. 3 is a schematic diagram of grid end points after selecting encoded reference starting grid end points in a method for coordinate transformation of geographic data according to the present invention;
fig. 4 is a schematic diagram illustrating a corresponding relationship between a grid endpoint and a point to be converted in the coordinate conversion method of geographic data according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
As shown in fig. 1, in the present application, in the present embodiment, all points to be transformed in the original coordinate system need to be transformed into the target coordinate system, and the specific objects of the original coordinate system and the target coordinate system in the present application can be determined by the user, for example, the target coordinate system is a 2000 country geodetic coordinate system, and at this time, other coordinate systems not belonging to the 2000 country geodetic coordinate system are all identified as the original coordinate system. The method specifically comprises the following steps:
obtaining grid data of a region to be converted, obtaining grid data of the region to be converted corresponding to the region to be converted in original coordinates, wherein the grid data of the region to be converted is original parameter information corresponding to each grid end point after the region to be converted is equally divided into a plurality of grid units containing four grid end points, and the original parameter information comprises longitude and latitude information and longitude and latitude correction information corresponding to a target coordinate system. In this embodiment, the original geographic data corresponding to the region to be converted in the original coordinate includes a plurality of points to be converted and conversion region grid data, the conversion region grid data is obtained by dividing the region to be converted in the original coordinate into a plurality of grid cells and each grid cell is surrounded by four grid end points, each point to be converted falls into one of the grid cells, where the grid cell is a square grid, that is, a line segment formed between two adjacent grid end points in the same grid cell is a desired one. As shown in fig. 2, in the original coordinate system, each black point represents a grid end point, and four grid end points adjacent to each other surround a grid unit.
And parameter coding, namely selecting any grid end point as a coding reference initial grid end point, setting grid point codes for the coding reference initial grid end point, and setting grid point codes corresponding to all the residual grid end points according to the distances between different grid end points and the coding reference initial grid points and the grid point codes corresponding to the coding reference initial grid end points. In this embodiment, it is preferable that a mesh end point located at a central position of an area to be converted or closest to the central position is used as a coding reference starting mesh end point, a mesh point code corresponding to the coding reference starting mesh end point is first set, in this embodiment, the mesh point code includes a longitude code and a latitude code, a longitude code corresponding to each mesh end point is set according to a longitude difference between a different mesh end point and a coding reference starting mesh point and the longitude code corresponding to the coding reference starting mesh end point, and a latitude code corresponding to each mesh end point is set according to latitude difference information between the different mesh end point and the coding reference starting mesh point and the latitude code corresponding to the coding reference starting mesh end point.
The following are exemplified: as shown in fig. 3, assuming that the mesh end point located at the central position in fig. 3 is taken as the encoding reference mesh end point, the encoding of its corresponding mesh point is set as: +0+0, where longitude is encoded as +0 and latitude is encoded as + 0. Let the longitude code corresponding to the east grid end point of the encoded reference starting grid be + X, and the longitude code corresponding to the west grid end point of the encoded reference starting grid be-X, where X is the number of grid end points spaced in the horizontal direction between the grid end point and the encoded reference starting grid plus 1. Similarly, let the dimension code corresponding to the north grid end point of the encoded reference starting grid be + Y, and the dimension code corresponding to the south grid end point of the encoded reference starting grid be-Y, where Y is the number of grid end points vertically spaced between the grid end point and the encoded reference starting grid plus 1. In fig. 3, the mesh point codes of the mesh points encoding the reference start mesh end points are +0+0, and then the mesh codes of the other 8 mesh end points are: +0+1, +0-1, -1+0,+1+0, -1+1,+1+1, -1-1,+1-1. All the grid terminals are encoded according to the above method to obtain the corresponding grid point codes.
And generating current parameter information, storing the grid point codes corresponding to each grid end point into the original parameter information, and obtaining and storing the current parameter information corresponding to each grid end point. The original parameter information corresponding to each grid point code comprises longitude and latitude information and longitude and latitude correction, so that a mapping relation is established between the corresponding grid point code and the longitude and latitude information and longitude and latitude correction corresponding to the corresponding grid end point, and the current parameter information corresponding to each grid end point is obtained and stored. The longitude and latitude information is longitude information and latitude information of each grid end point in an original coordinate, the longitude and latitude correction comprises longitude correction and latitude correction of the grid end point in a target coordinate system, and the parameters are known parameters.
Determining grid point codes, determining corresponding grid units from grid data of the area to be converted according to original longitude and latitude information corresponding to each point to be converted in the area to be converted, and determining grid point codes corresponding to four grid end points in the grid units according to the original longitude and latitude information corresponding to the point to be converted and longitude and latitude information corresponding to the coding reference starting grid end point. In this embodiment, the original longitude and latitude information of the point to be converted is the longitude and latitude information of the point in the original coordinate system, so that the region of the grid unit in the original coordinate can be determined according to the original longitude and latitude information of the point to be converted, the grid point codes of the grid end points located at the preset position in the grid unit are determined according to the numerical relationship between the original longitude and latitude information corresponding to the point to be converted and the longitude and latitude information corresponding to the code reference starting grid end point, and the grid point codes of the remaining three grid end points in the grid unit are determined according to the grid point codes of the grid end points located at the preset position. As shown in fig. 4, P in fig. 4 is a point to be converted, four black dots are mesh endpoints, P falls into a mesh unit composed of four mesh endpoints, when in actual calculation, one mesh endpoint in the mesh unit is found out first, in this embodiment, the mesh endpoint corresponding to the lower left corner of the mesh unit region corresponding to the point to be converted is determined first, then mesh point codes corresponding to other three mesh endpoints are determined quickly according to the mesh point code corresponding to the lower left corner mesh endpoint, and the mesh point code corresponding to the mesh endpoint at the lower left corner position, which is any number, is: x plus or minus Y; grid point password of the grid end point at the upper left corner: x + ± (Y + 1); grid point password of the upper right corner position grid end point: + (X +1) +/- (Y + 1); grid point password of grid end point at lower right corner: +/- (X +1) +/-Y. The X and the Y are integers.
And (3) coordinate conversion, namely screening out the current parameter information of four grid end points corresponding to each point to be converted according to grid point codes, and converting each point to be converted in the area to be converted into a target coordinate system according to a preset bilinear interpolation function, the original longitude and latitude information of each point to be converted and the current parameter information of the four grid end points corresponding to each point to be converted. The method specifically comprises the following substeps:
calculating conversion correction quantity, screening out the current parameter information of four grid end points corresponding to each point to be converted according to grid point codes, and inputting the original longitude and latitude information of each point to be converted and the current parameter information of the four grid end points corresponding to each point to be converted into a preset bilinear interpolation function to obtain the conversion correction quantity corresponding to each point to be converted. The preset bilinear interpolation function in the present embodiment is a conventional bilinear interpolation function in the prior art, and the core principle of the bilinear interpolation function is to use pixel values of adjacent 4 points, and assign different weights according to the distances between the pixel values and interpolation points to perform linear interpolation, so as to determine the correction quantity of a point needing to be converted according to the parameters of the adjacent 4 points.
And coordinate conversion, namely correcting the original longitude value of the point to be converted according to the longitude correction quantity and obtaining the current longitude value of the point to be converted in the target coordinate system, and correcting the original latitude value of the point to be converted according to the latitude correction quantity and obtaining the current latitude value of the point to be converted in the target coordinate system, so that the current longitude and latitude information containing the current longitude value and the current latitude value is obtained.
The present invention also provides an electronic device comprising: a processor;
a memory; and a program, wherein the program is stored in the memory and configured to be executed by the processor, the program comprising a coordinate transformation method for executing one of the geographic data in the present application.
The present invention also provides a computer-readable storage medium having stored thereon a computer program for executing a coordinate transformation method of geographical data in the present application by a processor.
The invention also provides a computer program product comprising a computer program which, when executed by a processor, implements a method of coordinate transformation of geographical data of the present application.
A coordinate conversion method of geographic data in the application, by choosing any grid end point as the encoding reference initial grid end point, setting grid point codes for the encoding reference initial grid end point, setting grid point codes corresponding to the remaining grid end points according to the distances between different grid end points and the encoding reference initial grid point and the grid point codes corresponding to the encoding reference initial grid end point, storing the grid point codes corresponding to each grid end point into the original parameter information, obtaining and storing the current parameter information corresponding to each grid end point, determining the corresponding grid unit from the grid data of the area to be converted according to the original longitude and latitude information corresponding to each grid end point to be converted, determining the grid point codes corresponding to four grid end points in the grid unit according to the original longitude and latitude information corresponding to the original grid end point to be converted and the longitude and latitude information corresponding to the encoding reference initial grid end point, the current parameter information of the four grid end points corresponding to each point to be converted can be rapidly and accurately screened out, so that the efficiency of converting the point to be converted from an original coordinate system to a target coordinate system is improved, and the accuracy of coordinate conversion is improved.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; those skilled in the art can readily practice the invention as shown and described in the drawings and detailed description herein; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (9)
1. A coordinate transformation method of geographic data, characterized by: the method comprises the following steps:
obtaining grid data of a region to be converted, and obtaining grid data of the region to be converted corresponding to the region to be converted in original coordinates, wherein the grid data of the region to be converted is original parameter information corresponding to each grid end point after the region to be converted is equally divided into a plurality of grid units containing four grid end points, and the original parameter information comprises longitude and latitude information and longitude and latitude correction information corresponding to a target coordinate system;
parameter coding, namely selecting any grid end point as a coding reference initial grid end point, setting grid point codes for the coding reference initial grid end point, and setting grid point codes corresponding to all the residual grid end points according to the distances between different grid end points and the coding reference initial grid points and the grid point codes corresponding to the coding reference initial grid end points;
generating current parameter information, storing the grid point code corresponding to each grid end point into the original parameter information, obtaining and storing the current parameter information corresponding to each grid end point;
determining grid point codes, determining corresponding grid units from grid data of an area to be converted according to original longitude and latitude information corresponding to each point to be converted in the area to be converted, and determining grid point codes corresponding to four grid end points in the grid units according to the original longitude and latitude information corresponding to the point to be converted and longitude and latitude information corresponding to the code reference starting grid end point;
and coordinate conversion, namely screening out the current parameter information of the four grid end points corresponding to each point to be converted according to the grid point codes, and converting each point to be converted in the area to be converted into a target coordinate system according to a preset bilinear interpolation function, the original longitude and latitude information of each point to be converted and the current parameter information of the four grid end points corresponding to each point to be converted.
2. A coordinate transformation method of geographical data according to claim 1, characterized in that: determining grid point codes corresponding to four grid end points in the grid unit according to the original longitude and latitude information corresponding to the point to be converted and the longitude and latitude information corresponding to the code reference initial grid end point specifically as follows: and determining grid point codes of grid end points positioned at a preset position in the grid unit according to the numerical relationship between the original longitude and latitude information corresponding to the point to be converted and the longitude and latitude information corresponding to the code reference starting grid end point, and determining grid point codes of the remaining three grid end points in the grid unit according to the grid point codes of the grid end points positioned at the preset position.
3. A coordinate transformation method of geographical data according to claim 1, characterized in that: the grid point codes include longitude codes and latitude codes.
4. A coordinate transformation method of geographical data according to claim 1, characterized in that: the latitude difference values of two adjacent grid end points with the same longitude are equal, the longitude difference values of two adjacent grid end points with the same latitude are equal, the longitude code corresponding to each grid end point is set according to the longitude difference value of the different grid end points and the coding reference starting grid point and the longitude code corresponding to the coding reference starting grid end point, and the latitude code corresponding to each grid end point is set according to the latitude difference information of the different grid end points and the coding reference starting grid point and the latitude code corresponding to the coding reference starting grid end point.
5. A coordinate transformation method of geographical data according to claim 1, characterized in that: the coordinate conversion specifically comprises the following substeps:
calculating conversion correction quantity, screening out the current parameter information of four grid end points corresponding to each point to be converted according to the grid point codes, and inputting the original longitude and latitude information of each point to be converted and the current parameter information of the four grid end points corresponding to each point to be converted into a preset bilinear interpolation function to obtain the conversion correction quantity corresponding to each point to be converted;
and coordinate conversion, namely correcting the original longitude and latitude information corresponding to the point to be converted according to the conversion correction quantity to obtain the current longitude and latitude information of the point to be converted in a target coordinate system.
6. A coordinate transformation method of geographical data according to claim 5, characterized in that: the conversion correction includes longitude correction and latitude correction, the original longitude and latitude information includes original longitude and latitude values, and the coordinate conversion specifically includes: and correcting the original longitude value of the point to be converted according to the longitude correction amount and obtaining the current longitude value of the point to be converted in a target coordinate system, and correcting the original latitude value of the point to be converted according to the latitude correction amount and obtaining the current latitude value of the point to be converted in the target coordinate system, so that current longitude and latitude information containing the current longitude value and the current latitude value is obtained.
7. An electronic device, characterized by comprising: a processor;
a memory; and a program, wherein the program is stored in the memory and configured to be executed by the processor, the program comprising a coordinate transformation method for executing a geographical data according to any one of claims 1 to 6.
8. A computer-readable storage medium having stored thereon a computer program, characterized in that: the computer program is executed by a processor to perform a method of coordinate transformation of geographical data according to any of claims 1-6.
9. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, carries out a method of coordinate transformation of geographical data according to any one of claims 1-6.
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