Method and system for transforming map coordinate system

Abstract

The invention provides a method and a system for transforming a map coordinate system. The method comprises the following steps: taking a coordinate point A in a map range of the current map coordinate system, and setting the coordinate point A as an original point of a two-dimensional coordinate system; transforming the coordinate point A to obtain a coordinate point A' by utilizing a coordinate transformation algorithm, and solving a mirror-image coordinate point B of the coordinate point A' about a symmetric axis of y=-x, wherein y is a longitudinal axis of the two-dimensional coordinate system, and x is a transverse axis of the two-dimensional coordinate system; transforming the mirror-image coordinate point B to obtain a transformed coordinate point B' according to the coordinate transformation algorithm; transforming the map coordinate system according to a longitude and latitude corresponding relation of the coordinate point A and the transformed coordinate point B'. By adopting the method and the system, the longitude and latitude among different geological coordinate systems can be mutually transformed freely, an effective and feasible corrective method can be provided for the coordinate encryption algorithm, the longitude and the latitude among different SDK (software development kit) of different maps can be corrected, and the precision and working efficiency for collecting the map information can be improved.

Description

technical field [0001] The invention relates to the technical field of GIS application, in particular to a method and system for converting a map coordinate system. Background technique [0002] In the existing map positioning function, by using GPS (Global Positioning System: Global Positioning System) and AGPS (Assisted Global Positioning System: Assisted Global Positioning System) for positioning, this positioning method may be blocked by buildings or Poor network conditions cause large positioning deviations or even failure to locate. In order to solve the error problem caused by the coordinate system on the map, it is often necessary to import an additional correction database to correct the position of the base station and recalculate the coordinates of the map. [0003] The currently used map coordinate systems mainly include the WGS-84 (World Geodetic System-1984 Coordinate System) coordinate system, the GCJ-02 Mars coordinate system (the coordinate system of the ge...

AI Technical Summary

Problems solved by technology

Map suppliers generally only provide an encryption algorithm for converting from other coordinate systems to their own coordinate system, referred to as the coordinate conversion algorithm. Due to the non-standardization of data and the limitation that the coordinate system cannot be converted at will, free conversion of latitude and longitude cannot be achieved between coordinate systems. At the same time, the data obtained in the road test cannot be widely used in GIS applications in other coordinate systems, which seriously affect the accuracy and work efficiency of map information collection

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