精化山区大地水准面的一种方法——GPS、测距三角高程与地形的组合

A METHOD OF REFINING THE GEOID IN MOUNTAINOUS AREA ——Combination of GPS, ranging trigonometric leveling with topographic data

鉴于我国中西部是多山地区，为满足国家统一高程和山区建设的需要，本文提出了用ＧＰＳ和测距三角高程的方法确定高程异常，再用地形数据推求重力异常垂直梯度，由此可以经济和快速地实现精化大地水准面的目标。这时边远山区任意一点的精度可达３０ｃｍ。

In view of mountainousness in central and western China a method of refining the geoid is presented to meet the need for unifying height and mountain exploitation.In the method the height anomaly is first determined using the GPS and ranging trigonometric leveling, and it is then converted into the geoidal undulation taking into account the perpendicular gradient of gravity anomaly in terms of topographic data. Using this method the geoid refinement can be realized quickly and economically, the geoid in mountainous area is expected to be achieved with a 30 cm accuracy.