An Approximate Equal-area Diamond Mesh Model Based on Latitude-ring Method and Triangle Aggregation

doi:10.13474/j.cnki.11-2246.2018.0020

Abstract

Abstract:

The spherical diamond grid has been widely used in space operation and data integration, because of its geometrical features, such as the simple structure, the orientation consistency, and the radial symmetry. In this paper, a QTM subdivision model based on the latitude-ring (L-R) method is constructed. The grid area deformation and its location distributions are also analyzed. Then we find that the grid area deformation of this model has the same direction and the "zigzag" distribution characteristics, which means that the adjacent two grid cells are alternatively distributed, one large and one small. So we obtain an approximate equal-area diamond mesh model by merging the two adjacent grid cells up and down. The results show that, compared to other methods of generation spherical diamond mesh, this one is simple in calculation (the long axis distributes along the north and south direction). At the same time, the grid cell generated by this method has a smaller area deformation and more uniform distribution.

Key words: discrete global grid system, equal-area diamond mesh model, latitude-ring method subdivision, geometry deformation of grid

CLC Number:

P208

YUAN Zhengyi, ZHAO Xuesheng, ZHAO Jing. An Approximate Equal-area Diamond Mesh Model Based on Latitude-ring Method and Triangle Aggregation[J]. 测绘通报, 2018, 0(1): 107-111.

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