根据西南角坐标及比例尺，计算本标准分幅的平面面积及球面面积等，为地理信息系统行业的常用工具

计算地球分层球面粘弹性变形程序，对于研究地震、地壳形变人员十分有用-Calculate the Earth layered spherical viscoelastic deformation process, the study earthquakes, crustal deformation staff very helpful

高斯投影正算，投影与变形 地图投影:就是将椭球面各元素(包括坐标、方向和长度)按一定的数学法则投影到平面上。-Gauss projection is calculated, and the deformation of the projection map projection: that the ellipsoid of each element (including coordinates, direction and length) by a certain mathematical ru

根据经纬度计算椭球面子午圈半径、卯酉圈半径、纬圈半径、平行圈弧长以及梯形图幅面积。-According to the latitude and longitude calculation ellipsoid meridian radius, the radius of the circle, the radius of the circle, the length of the parallel circle and the ladder area.