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Method for rapidly converting geographic coordinates into spherical triangle discretization grid codes

A spherical triangle, geographic coordinate technology, applied in the field of geographic information, can solve problems such as low efficiency, and achieve the effect of improving conversion efficiency

Active Publication Date: 2017-10-03
NANJING NORMAL UNIVERSITY
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  • Description
  • Claims
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Problems solved by technology

If it is possible to find a suitable control subdivision level as the threshold according to the change law of the geometric properties of the grid, use a recursive approximation conversion method that can ensure accuracy but low efficiency in the subdivision level below the threshold, and use a recursive approximation conversion method that is higher than the threshold If the subdivision level of the grid is similar to the direct mapping method of the planar grid, it is possible to construct a new hybrid conversion method that takes both accuracy and efficiency into consideration.

Method used

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  • Method for rapidly converting geographic coordinates into spherical triangle discretization grid codes
  • Method for rapidly converting geographic coordinates into spherical triangle discretization grid codes
  • Method for rapidly converting geographic coordinates into spherical triangle discretization grid codes

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Embodiment 1

[0067] In this embodiment, the longitude and latitude coordinates P (118.9139003°E, 32.1145815°N) of the School of Geographical Sciences, Xianlin Campus, Nanjing Normal University are converted into a 1:10,000 scale map (the target subdivision level is 22, and the control subdivision level is 7 ) corresponding to the regular icosahedral triangular discrete grid SQC code as an example.

[0068] The conversion process in this embodiment is divided into two parts, the recursive approximation before controlling the subdivision level and the direct mapping after controlling the subdivision level.

[0069] 1. The steps of the recursive approximation process are as follows:

[0070] Step 1: Convert P(118.9139003°E,32.1145815°N) into space Cartesian coordinates P(-2620.8871131827618,4745.0076361872807,3402.3305648447690), and initialize the row, column number and subdivision level of the grid code: X=0, Y=0 , l=0;

[0071] Step 2: According to the relationship between point P and th...

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Abstract

The invention discloses a method for rapidly converting geographic coordinates into spherical triangle discretization grid codes. The method comprises the following steps of inputting a longitude and latitude coordinate point P and a measuring scale of a map where the P is located; according to the measuring scale of the map, determining a target dissection level L and a control dissection layer LC of grid codes; performing recursive approaching before the control dissection layer and direct mapping after the control dissection layer; converting final row and column numbers into grid codes to be output as a result. By means of change rules of geometric properties of the spherical triangle discretization grid, on the premise of ensuring the conversion precision, the conversion efficiency of the spherical triangle discretization grid codes and the geographic coordinates can be remarkably improved, the algorithm time complexity is improved along with dissection layers and grows linearly, and the method has obvious advantages compared with traditional algorithms.

Description

technical field [0001] The invention relates to geographic information technology, in particular to a method for rapidly converting geographic coordinates to spherical triangular discrete grid codes. Background technique [0002] Spherical triangle discrete grid is a classic global discrete grid system. It takes the triangle as the basic grid unit, and performs isomorphic discretization on the spherical space based on the regular octahedron or icosahedron to form a multi-scale global grid system with hierarchical recursion, uniform unit shape, seamless and non-overlapping ( Tong, 2013). After long-term research by many scholars, the spherical triangular discrete grid has not only become an effective tool for global multi-resolution spatial data modeling, but also widely used in spatial data indexing and visualization (Goodchild, 1992; Feket, 1990), map synthesis model (Dutton, 1996), global navigation model (Lee, 2000), global environmental monitoring (Dutton, 1999), globa...

Claims

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Application Information

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IPC IPC(8): G06F17/30
CPCG06F16/29
Inventor 练文杰周良辰林冰仙许德朋闾国年
Owner NANJING NORMAL UNIVERSITY
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