DEM网格间距及校正半径对重力地形校正的影响

张菲菲, 王万银, 李倩, 王林, 马静

Influence of DEM grid spacing and correction radius on terrain correction in gravity exploration

ZHANG Fei-Fei, WANG Wan-Yin, LI Qian, WANG Lin, MA Jing

表2 不同网格间距地形数据计算结果对比(平原)

Table 2 Compare of calculate result of terrain correction values based on different grid spacing (flat-land area)

校正范围/m 均方根误差/(10-5m·s-2) 10 m网格 间距 25 m网格 间距 50 m网格 间距 100 m网格 间距 0~20 0.007620 20~50 0.000203 50~100 4.519×10-5 0.000136 0.00322 100~200 1.463×10-5 5.120×10-5 9.626×10-5 0.000225 200~500 5.893×10-6 1.763×10-5 3.189×10-5 6.259×10-5 500~1000 3.545×10-6 5.549×10-6 9.136×10-6 1.187×10-6 1000~1500 3.020×10-6 3.617×10-6 4.429×10-6 5.065×10-6 1500~2000 3.980×10-7 8.788×10-7 1.502×10-6 1.906×10-6 2000~3000 4.337×10-7 8.955×10-7 1.522×10-6 1.777×10-6 3000~5000 3.374×10-7 7.228×10-7 1.575×10-6 1.402×10-6 5000~10000 4.326×10-6 1.290×10-5 3.627×10-5 7.842×10-5