区域椭球面上数字高程模型的建立

New DEM Based on Surface of Regional Ellipsoid

提出了在局部区域的椭球面上建立数字高程模型的原理和方法。这种椭球面的DEM是在区域性椭球面上基于新大地坐标系建立的,不同于现有的基于投影平面的DEM。由于未经过从椭球面到平面的投影,从而杜绝了投影变形,也消除了平面位置与水准高程之间作为3维坐标的不兼容性。在具体建模中,直接基于与测区平均高程面最优拟合的区域性椭球面,采用格网DEM的建模方法来建立椭球面DEM。

This paper proposed the principle and method of ellipsoid-based DEM, which is essentially different from DEM based on projected plan because it is built based on a new form of geodetic coordinate system on regional ellipsoid. The regional ellipsoidal surface is more coincidental with the surface of mean height in the region. As for implementation, in contrast to some applications for GIS in which Grid net on the surface of ellipsoid is replaced by Grid net on the surface of projected plan. DEM is built by the method of Grid net on the surface of regional ellipsoid.