地球椭球面上两点间椭球面距离的准确计算

Accurate Calculation of Ellipsoidal Surface Distance between Two Points on Earth Ellipsoid Surface

国军标中，地球椭球面上两点间球面距离计算方法适用范围有限，文章论述了一种具有普适性的准确计算方法，给出了计算过程和一些计算结果。在国军标中的算法适用范围内，本文的算法计算结果与国军标中仅有的4个椭球面距离计算结果进行了比对，结果表明，地球上南北半球相距很远的两点，本文的算法优于国军标的算法，并通过实例说明地球椭球面上两点间球面距离准确计算的应用和意义。

Based on the limitation of application scope of calculation method of ellipsoidal surface distance be- tween two points on earth ellipsoid surface in GJB, this paper discusses the accurate algorithm which has a wide application, and gives computational process and results. The paper compares the calculation results with the only 4 ellipsoidal surface distance results in application scopes of algorithm in GJB. The result obtained shows that the algorithm in the paper is superior to the algorithm in GJB. The application and significance of the accurate algo- rithm are verified with a case study.