Seven-parameter conversion method between national three-dimensional coordinate system and random local plane coordinate system

Abstract

The invention discloses a seven-parameter conversion method between a national three-dimensional coordinate system and a random local plane coordinate system. The seven-parameter conversion method between the national three-dimensional coordinate system and the random local plane coordinate system aims at the problems that an existing algorithm cannot directly obtain a high-precision single seven-parameter conversion parameter, and further the achievements of a local coordinate system cannot be obtained in real time based on CORS measured data, and provides a seven-parameter convention model to which addition constants are additionally added. According to the method, through a series of data processing methods, the additionally added addition constants greatly decrease the influence of projection deformation; the influence of a geodetic height on parameter solving precision, and the like are decreased through a three-parameter conversion model; the precision of a conversion parameter is greatly improved; moreover, the method accords with the requirement that a measurement handbook in the current market can only accept single four / seven-parameter input; the achievements of a national coordinate system, which are obtained through measurement based on a CORS network, can be converted into the achievements of the local coordinate system in real time; in this way, the expansion of the application spaces of provincial and municipal CORSs in a measurement practice process is facilitated.

Description

technical field

[0001] The invention belongs to the technical field of geographic information, and relates to a seven-parameter conversion method between a national three-dimensional coordinate system and an arbitrary local plane coordinate system, in particular to a new high-precision seven-parameter conversion method between a national three-dimensional coordinate system and an arbitrary local plane coordinate system Find the method. Background technique

[0002] The national geodetic datum and local datum data are confidential data. In order to keep the datum parameters confidential, most provinces, cities and regions have carried out projection transformation of the central meridian on the basis of the national coordinate system when establishing the local coordinate system. After the transformation, the coordinates undergo a four-parameter transformation (irregular translation, rotation, scaling, etc.), which makes a relatively complicated transformation relationship be...

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