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4 不同网格间距地形数据计算结果对比(山地)

Table 4 Compare of calculate result of terrain correction values based on different grid spacing (mountain 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 0.017771 20~50 0.005265 50~100 0.003399 0.010793 0.030051 100~200 0.001998 0.009388 0.028690 0.076599 200~500 0.001272 0.007057 0.022021 0.060082 500~1000 0.000440 0.002757 0.008825 0.022756 1000~1500 0.000144 0.000938 0.00308 0.007950 1500~2000 7.145×10-5 0.000479 0.001569 0.003993 2000~3000 6.455×10-5 0.000467 0.001554 0.004041 3000~5000 4.704×10-5 0.000366 0.001178 0.003177 5000~10000 3.250×10-5 0.000257 0.000826 0.002251 10000~15000 1.183×10-5 8.595×10-5 0.000280 0.000784 15000~20000 4.650×10-6 3.406×10-5 0.000111 0.000312