THE EFFECT OF THE GRID SPACING OF ELEVATION ON THE ACCURACY OF MEDIAN REGION TERRAIN CORRECTION OF GRAVITY
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摘要: 为了解高程数据网格间距对表面积分法、直立长方体法和平均高程直立长方体法计算的中区地形改正值精度的影响,笔者选择某地区450个测点,并使用不同网格间距高程数据计算中区地改值,通过对比发现表面积分法计算精度受高程数据网格间距影响较小,而直立长方体法反之。然后将中区地改50~2000 m分为10个区间段进行计算,通过统计得出误差的45%和30%左右都分布在50~200 m和200~500 m段,因此提出提高中区地形改正精度必须提高50~200 m和200~500 m内高程数据网格密度。Abstract: For understanding the effect of different grid spacing intervals of DEM on terrain correction accuracy of the triangular-ele-ment method, the rectangular method and the average elevation rectangular method, the authors calculated the terrain correction values of 450 stations with different grid intervals of DEM. A comparative study shows that the effect of DEM grid spacing on terrain correction accuracy of the triangular-element method is insignificant, and things are just the opposite for the rectangular method. The authors also divided terrain correction ranges into 10 intervals and calculated the corresponding terrain correction values. Statistics show that the 45% and 30% residuals are mainly distributed in the ranges of 50~200 m and 200~500 m, and it is therefore proposed that the eleva-tion data grid density in the ranges of 50~200 m and 200~500 m should be increased so as to increase the terrain correction accuracy.
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