推导出用三顶点的测地坐标计算地球椭球面上三角形面积的公式。
The formula for area of triangle on ellipsoid by means of geodesic coordinate is derived in this paper.
本文提供了坐标系统的变换公式，以达到在同一椭球面上进行距离计算。
This paper affords the transformation formula of coordinate systems so that the calculation of propagation range may be carried out on the same spheroidal surface.
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