综合球坐标系和直角坐标系的性质，将三维坐标映射到一个包围该三维直角坐标系的球面的切平面上，实现三维到二维的映射

采用SHP文件组织的气象图形标绘程序，地图分球面和平面两种方式，可以标绘点、线、面等气象图形，可以设置颜色、线宽、填充色等多种样式。-SHP files using graphical meteorological organizations plotting procedures, sub-spherical and planar map in two ways, you can plot point, line, surface, such as weather graphics, you

针对非合作遥感影像坐标偏差问题，根据google earth球面距离算法，给予自动修正。-For non-cooperation in remote sensing image coordinates of deviation, according to google earth spherical distance algorithm to give automatic correction.

距离改化，测绘学科。将椭球面上两点球面距离改化为地图上距离-Change of the distance, surveying and mapping disciplines. Two spherical surface of the ellipsoid into the map to change the distance from the