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Detemining Accuracy of Local Geoid Determined from Airborne Gravity Data
Author(s): 
Pages: 692-695
Year: Issue:  8
Journal: GEOMATICS AND INFORMATION SCIENCE OF WUNAN UNIVERSITY

Keyword:  航空重力测量滤波尺度大地水准面向下延拓;
Abstract: 探讨了空中重力扰动的滤波尺度和向下延拓方法对局部大地水准面确定精度的影响.实测数据分析表明,直接代表法不受测区形状及范围大小限制且无边界效应,成为最合适的向下延拓方法;100~250 s的滤波尺度均适用于大地水准面的确定,顾及滤波器边界效应的影响,宜采用小一些的滤波尺度如100 s.无论是空中比较还是地面比较,利用航空重力数据确定的局部大地水准面,其与参考大地水准面的比较精度可以达到±3 cm.
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