基于地球椭球体等距正反方位投影参数计算

等距方位投影所提供的主要投影参数是大地距离和大地方位角,可以直接服务于多种目的。等距反方位投影是以定点为极,动点至定点的大地距离和大地方位角保持真值。推导出了这两种投影的坐标计算公式,以及远程大地距离与大地方位角的计算与应用,并以实际算例进行了演示验证。

Calculation of Azimuth and Coordinate Based onAzimuthal Equidistant Projection of Euipsoid

Azimuthal equidistant projection provides main projection parameters of geodetic distance and geodeticazimuth for multiple purposes.Retoazimuthal equidisthat projection takes a fixed point as the polar point,and thegeodetic distance and geodetic azimuth from the moving point to the fixed point keep the real values.In thispaper,the coordinate calculating formulae of the above two kinds of projection are derived,as well as thecalculation and application of the long-distance geodetic distance and geodetic azimuth,and the exampledemonstration and verification are conducted.