利用matlab差分法计算平行平面场的例子，附有文档详细说明并附运行结果图，希望给大家带来帮助-A FDTD sample in matlab, attached with a pdf instruction.May it be hopeful.

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.