Map coordinates transformation method based on shape fidelity
A conversion method and technology of map coordinates, applied in directions such as road network navigators, can solve problems such as conversion method errors, coordinate system differences, overlap or reversal, and achieve the effect of maintaining the overall shape
Active Publication Date: 2009-11-25
WUHAN ZHONGHAITING DATA TECH CO LTD
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[0013] Due to coordinate system differences and conversion method errors, the road phase relationship of the target data is overlapped or reversed compared with the original data
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[0027] Such as Figure 4 As shown, the implementation of the present invention comprises the following steps after starting:
[0028] 1) Coordinate conversion
[0029] The purpose of coordinate conversion is to multiply the original coordinates by a certain coefficient to obtain a high-precision virtual coordinate system, so that the grid lines of the original coordinate system and the target coordinate system can find the corresponding coordinates in the virtual coordinate system, so that When the coordinates are moved, it is only necessary to move the original coordinates to the most suitable target coordinates nearby, and there is no problem of rounding errors. This is a necessary preparation for coordinate shifting and coordinate normalization.
[0030] The method of determining the coefficient is as follows:
[0031] Define the size of the coordinate system of the virtual coordinate system as the product of the least common multiple of the size of the original coordina...
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The invention provides a map coordinates transformation method based on shape fidelity, comprising the steps of: 1) coordinates conversion, namely, a high-accuracy virtual coordinate system is established so that an original coordinate system and an objective coordinate system can be simultaneously visible under the coordinate system; 2) movement of coordinates, namely, all the coordinates are moved from the original coordinate system to the objective coordinate system on the basis of remaining shape of road network; 3) normalization of coordinates, namely, the virtual coordinate system is transformed into the objective coordinate system via coordinate scaling; 4) compression of shape points, namely, on the basis of remaining fundamental shape of the road network and not causing new LINK reversion, unnecessary shape points are removed; 5) processing of LINK reversion, namely, the existing LINK reversion problem is solved by moving objective coordinates. With the method, the shape of the road network can be remained to a maximum extent on the basis of avoiding the generation of LINK reversion problem in the process of transforming map coordinate system.
Description
technical field [0001] The invention belongs to the field of electronic maps, in particular to a navigation electronic map data format conversion process. Background technique [0002] During the data format conversion process of navigation electronic map, it is often necessary to convert the high-precision coordinate system to the low-precision coordinate system. The usual coordinate conversion method is to perform rounding or direct truncation after the coordinates are scaled. Problems such as road shape distortion and LINK inversion often occur due to LINK (section) angle changes caused by rounding errors. It causes troubles for map matching and voice guidance of the navigation system, and affects the map display effect of the navigation system at the same time. [0003] Explanation of related terms: [0004] 1.MESH (mesh) [0005] In order to facilitate the management and query of map data, the navigation system usually stores the map data in sections according to a ...
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IPC IPC(8): G01C21/32
Inventor 朱敦尧戴泽军宋向勃王鹏冯颖夏丹
Owner WUHAN ZHONGHAITING DATA TECH CO LTD