采用新型大地坐标系进行地形变分析的探索

ANALYSIS OF CRUSTAL DEFORMATION WITH A NEW TYPE OF GEODETIC COORDINATE SYSTEM

分析了现有几种水平位移分量的表述形式,并提出了基于新型大地坐标系表述水平位移的设想。新大地坐标与大地经纬度之间具有严密的转换关系,可用它来表述形变点在椭球面上沿南北方向和东西方向的水平位移分量。以长度作为坐标参数的新型大地坐标系,能方便而精确地实现椭球面上的解算,有着简洁的椭球面第一基本形式,能使平面点位及水平位移基于同一种坐标进行表述,这将有助于对地壳应变场的表示和确定。

Several expressions of horizontal displacements have been analyzed. A new idea in which the horizontal displacements are represented based on the new type of geodetic coordinate system is put forward. According to the transformation formulas between the new geodetic coordinate and the geodetic longtude and latitude, the horizontal displacement components along the northern （ southern ） and eastern （ western ） direction on the ellipsoidal surface can be expressed with the new system. Taking the length as the coordinate parameter, the geodetic computation can be realized simply and conveniently and the first fundamental form on the ellipsoidal surface is brief in the new geodetic coordinate system, so the planimetric position and horizontal displacements can be expressed in the same type of coordinate system. It would be beneficial to the strain field analysis.