根据所给的江苏省境界数据 – 显示并计算江苏省十三个地市的面积 – 编写墨卡托投影反算程序，转换上述数据为经纬度坐标，并显示 – 根据地球椭球体表面上的梯形面积计算方法，基于经纬度坐标计算江苏省十三个地市的面积-According to the data given in the realm of Jiangsu Province - Display and calculate the thirteen cities in Jiangsu Province, an area

地球与火星坐标转换demo：适合学习从地球坐标转换成火星坐标的算法应用.-Mars coordinate transformation demo：Suitable for studying coordinates earth into Mars coordinates algorithm.

坐标转换，在空间直角坐标系中，地球坐标可以设为,h为地面到大气层外圈的距离，R为地心到地面的距离-Coordinate transformation, in the space rectangular coordinate system, the earth coordinates can be set to, h for ground to the atmosphere of the outer ring distance, R is the distance to the center of