The Construction of Hexagonal Discrete Global Grid by Numerical Projection Transformation
Zhong Xiao-Chong, Fen Jin, Ying Wang · Acta Geodaetica et Cartographica Sinica · 2013
The key step of the process of generating Discrete Global Grid System was discussed,which is correspondence between planes grids and spherical grids.An optimized target function was proposed to evaluating geometrical properties of discrete global grids.Optimizing by genetic algorithm(GA),direct spherical partition grids,which met optimization requirements under limited layers,were obtained.Applying control point data of the grids and combining theories of numerical projection,global hexagonal discrete grid system,with more even geometrical properties,was constructed.Experimental results proved that,compared with current Snyder equal-area polyhedral projection,the grid units obtained by our method were more even and had 2.5 to 3 times higher operation efficiency.