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Method for obtaining independent city coordinate system parameter based on geographic information application

An independent coordinate system and parameter acquisition technology, which is used in special data processing applications, electrical digital data processing, measuring devices, etc., and can solve the problems of difficulty in obtaining and the confidentiality of urban independent coordinate system parameters.

Active Publication Date: 2013-11-13
CHONGQING GEOMATICS & REMOTE SENSING CENT
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0039] When converting between the city independent coordinate system and the national general coordinate system, it is necessary to know the parameters of the city independent coordinate system, but the parameters of the city independent coordinate system are confidential and difficult to obtain in practical applications

Method used

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  • Method for obtaining independent city coordinate system parameter based on geographic information application
  • Method for obtaining independent city coordinate system parameter based on geographic information application
  • Method for obtaining independent city coordinate system parameter based on geographic information application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Embodiment 1, the conversion of a city's independent coordinate system and Beijing 54 coordinate system

[0074] First of all, using GPS to jointly measure Beijing 54 coordinates and a city’s independent coordinates, 8 points with the same name were measured, as shown in Table 1 below.

[0075] Table 1 Results table of points with the same name in a city’s independent coordinate system and Beijing’s 54 coordinate system

[0076]

[0077] Secondly, use the results of points 1 and 2 to calculate the coordinate parameters according to formula 11, formula 10, formula 5 and formula 6.

[0078] in:

[0079] Central Meridian: 108:45:05.029260

[0080] Ellipsoid major radius: 6379489.37490557

[0081] North offset: -6.15235514800548 meters

[0082] East offset: 500144.292887685 meters

[0083] Third, use the coordinate system parameters to bring the results of points 1, 2, and 3 into the seven-parameter transformation model, and calculate the seven parameters as:

[00...

Embodiment 2

[0094] Embodiment 2, conversion of a certain city's independent coordinate system and Xi'an 80 coordinate system

[0095] First of all, using GPS, Xi'an 80 coordinate system and a city's independent coordinate measurement, 5 points with the same name were measured, as shown in Table 3 below.

[0096] Table 3. Results table of the conversion of the same name points between the independent coordinate system of a certain city and the Xi'an 80 coordinate system

[0097]

[0098] Secondly, use the results of points 1 and 2 to calculate the coordinate parameters according to formula 11, formula 10, formula 5 and formula 6.

[0099] in:

[0100] Central Meridian: 105:53:58.943278

[0101] Ellipsoid major radius: 6378423.47268279

[0102] North offset: -3199971.81273551 meters

[0103]East offset: 49971.3935643691 meters

[0104] Third, use the coordinate system parameters to bring the results of points 1, 2, and 3 into the seven-parameter transformation model, and calculate t...

Embodiment 3

[0115] Embodiment 3, the conversion of a city's independent coordinate system and the 2000 national coordinate system

[0116] First of all, using GPS to measure with 2000 national coordinates and a city’s independent coordinates, 9 points with the same name were measured, as shown in Table 5 below.

[0117] Table 5 Results of points with the same name in the independent coordinate system and the 2000 national coordinate system

[0118]

[0119] Secondly, use the results of points 1 and 2 to calculate the coordinate parameters according to formula 11, formula 10, formula 5 and formula 6.

[0120] in:

[0121] Central Meridian: 108:22:17.492463

[0122] Ellipsoid major radius: 6378421.52585621

[0123] North offset: -1.9293381461545 meters

[0124] East offset: 499965.255096663 meters

[0125] Third, use the coordinate system parameters to bring the results of points 1, 2, and 3 into the seven-parameter transformation model, and calculate the seven parameters as:

[01...

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Abstract

The invention requests to protect a method for obtaining an independent city coordinate system parameter based on geographic information application, and relates to a method for calculating an approximate parameter of an independent city coordinate system by using a gauss projection technology, so as to achieve inter-conversion of geographic information results. A unitary polynomial equation concerned with a central meridian L0 of the independent coordinate system is simplified by obtaining three same point results of one independent city coordinate system and the national general coordinate system and transforming a gauss projection normal calculation formula; the central meridian L0 can be resolved by using an iteration method, so as to calculate other parameters of the independent coordinate system; the other parameters include reference ellipsoid long radius a, the central meridian L0, north direction offset X0 and east direction offset Y0. Thus, conversion and application of the same point results between the independent coordinate system and the national general coordinate system can be achieved. The method can be widely applied to conversion and application of geographic space information coordinates in construction of geographic spatial data, digital city construction and the like.

Description

technical field [0001] The invention relates to a method for realizing mutual conversion of geographical information among various coordinate systems by estimating parameters of an independent coordinate system of cities by using Gaussian projection technology, in particular to a method for obtaining parameters of independent coordinate systems of cities based on geographic information applications. Background technique [0002] With the advancement of computer and information technology, the geographic information industry has made great progress. As the core assets of the geographic information industry, the importance of geographic information data is increasingly prominent. my country's existing geospatial information is distributed horizontally in different commissions and bureaus, and vertically scattered in multi-level administrative levels such as cities, districts (counties), and townships (towns), showing the typical complex characteristics of "multiple distributio...

Claims

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Application Information

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IPC IPC(8): G01C15/00G06F19/00
Inventor 高翔罗灵军张泽烈袁超蒲德祥张治清胡艳李莉程宇翔李仕锋
Owner CHONGQING GEOMATICS & REMOTE SENSING CENT
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