2000 Independent coordinate system parameter acquisition method, device and computer-readable storage medium

Abstract

The invention provides a method and a device for acquiring parameters of a 2000 independent coordinate system and a computer readable storage medium. The method comprises the following steps: settinga first projection parameter according to central meridian of a target city coordinate system and a projective plane elevation; performing Gaussian projection on CGCS2000 geodetic coordinates of coincidence control points in multiple pre-acquired control networks of the target city so as to obtain a first Gaussian projection coordinate according to the first projection parameter; calculating a first plane conversion parameter according to the first Gaussian projection coordinate, the conventional plane coordinates of the pre-acquired coincidence control points of the target city and a preset parameter transformation model; and determining an optimal translation parameter and an optimal projection parameter according to a rotation angle parameter and a scale parameter of the first plane conversion parameter. According to the method, the projection parameter and the translation parameter of the 2000 independent coordinate system of the target city can be accurately acquired, smooth transition between the 2000 independent coordinate system of the target city and the existing coordinate system is realized, and the coordinate consistency between the 2000 independent coordinate system ofthe target city and the existing coordinate system is improved.

Description

technical field [0001] The present invention relates to the technical field of coordinate system parameter acquisition, in particular to a method, device and computer-readable storage medium for acquiring 2000 independent coordinate system parameters. Background technique [0002] At present, under the requirement of the National Bureau of Surveying and Mapping to establish the 2000 independent coordinate system of the city, some cities in China have established the 2000 independent coordinate system, such as: Wuhan 2000 independent coordinate system, Ningbo 2000 independent coordinate system and Nanchang 2000 independent coordinate system; However, there are many problems in the process of establishing the independent coordinate system of 2000 cities. The most typical one is that the consistency of the old and new coordinates cannot be guaranteed. The deformation exceeds the limit, and the connection between the old and new data is not considered, and the coordinates of the...

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Problems solved by technology

[0002] At present, under the requirement of the National Bureau of Surveying and Mapping to establish the 2000 independent coordinate system of the city, some cities in China have established the 2000 independent coordinate system, such as: Wuhan 2000 independent coordinate system, Ningbo 2000 independent coordinate system and Nanchang 2000 independent coordinate system; However, there are many problems in the process of establishing the independent coordinate system of 2000 cities. The most typical one is that the consistency of the old and new coordinates cannot be guaranteed. The deformation exceeds the limit, and the connection between the old and new data is not considered, and the coordinates of the old and new coordinate systems have certain differences; the independent coordinate system of Ningbo 2000 city does not meet the requirement of less than 1 / 40,000 (2.5cm / km) due to the projected deformation on the east and west sides of the city Requirements, only translation is required between the old and new coordinates, but the translation parameter is a large number A of 100km plus a decimal B, but B is inconsistent in different regions, which is not easy to use; the independent coordinate system of Nanchang 2000 city is deformed due to the projection of the eastern and western edge areas If the requirements are not met, the coordinate difference between the old and new coordinate systems is large, and the 1:500 topographic map data of the planning area needs to be converted before it can continue to be used, and a lot of manpower, material and financial resources are required to carry out the map conversion work

Therefore, in the process of building a new city 2000 independent coordinate system based on the CGCS2000 reference ellipsoid, how to meet the specification requirements that the projected length deformation does not exceed 1 / 40,000, and also meet the seamless connection with historical data, so that the results under the existing coordinate system It can be used continuously, avoiding the inconsistency of the two coordinate systems, which will lead to huge conversion workload and cost, and has become an urgent problem to be solved for the newly built city 2000 independent coordinate system based on the CGCS2000 reference ellipsoid

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