椭球参数对大地坐标转换的影响——大地坐标微分公式再推导

Deducing from geodetic coordinate differential formula

针对e(椭圆第一偏心率)与a(椭圆的长半轴)之间的函数关系,对大地坐标微分公式进行了再次推导,得出一种新的广义大地微分公式.对两公式进行比较,并用WGS-84坐标与BJ54坐标转换的差异进行计算、分析,结果表明:在小区域范围内,利用两公式进行坐标转换效果相差不大,但对测区范围较大的情况,新的大地坐标微分公式为获得GPS测点的高精度坐标转换,提供了有用的工具.

Based on the relation of function between ＂e＂ and ＂a＂, geodetic coordinate differential formula is further deduced in detail and a new kind of geodetic coordinate differential formula is obtained in the paper. By comparing formula, computing and analyzing the difference of coordinate transformation, the conclusions are gained： very minute interval between them in small scope, but the new formula is a useful tool to get high precise coordinate transformation of GPS measuring point in large scope.