This paper proposes the principle and method of ellipsoid-based DTM,which is essentially different from DTM based on projected plane because it is built based on geodesic coordinate system on regional ellipsoid.

• 对于较大的局部区域 ；首次提出了在椭球面上建立数字地面模型 (DTM )的原理和方法 .；这种椭球面DTM是在区域性椭球面上基于测地坐标系建立起来的；因此不同于基于投影平面的现有的DTM