地球椭球面上另一种形式的测地坐标系的建立

Establishment of Another Form of Geodesic Coordinate System on Earth Ellipsoid

提出了地球椭球面上另一种形式的测地坐标系 ,定义了两族互为正交的坐标曲线的参数 ,推导出测地平行线长度归化因子的计算公式 .与习用的测地坐标系———大地坐标系相比较 ,由此来表述地球椭球面上的点位 ,有其特有的优点 ,有利于在较大的局部地区中建立三维GIS可视化模型 .

This paper puts forward another form of the geodesic coordinate system on the earth ellipsoid for the first time.Expressed by length quantities u=s y,v=s x,two curvilinear coordinates or parameters are defined,with which two coordinate curves are constituted on the earth ellipsoid and vertical with each other.The formula for the scale factor of length of geodesic parallel lines is derived.It is showed that this scale factor depends on the length of geodesic parallel line from the point to the initial v coordinate curve.In order to indicate points on the earth ellipsoid,this form of the geodesic coordinate system is superior in some aspects to the conventional geodesic coordinate system i.e.geodetic coordinate system.It is favourable for setting up the three-dimensional visible GIS model in relatively large region.