DEM网格间距对重力远区地改精度的影响及效果

doi:10.11720/wtyht.2020.0013

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摘要

1∶5万重力远区地改一般由测区的1∶5万DEM高程模型改正获得。1∶5万DEM可按不同网格间距拼接而成,不同网格间距对应了不同的地改精度;RGIS是由自带高程库参与计算,完成测区1∶5万重力远区地改。本文以山东省栖霞市臧家庄幅1∶5万重力远Ⅰ区(2~20 km)地改为例,通过采用25、50、100、200 m四种网格节点距进行了1∶5万DEM数据拼接和改进的双线性插值法重力远Ⅰ区地改、均方误差计算,并与RGIS自带高程库重力远Ⅰ区地改均方误差比较分析,证实基于1∶5万DEM高程模型重力远Ⅰ区地改精度优于RGIS自带高程库重力远Ⅰ区地改精度。基于DEM改进的双线性插值法远区地改布格重力异常和高程相关度更高,对线性构造和地层、岩体的边界的识别精度高。

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	李忠平
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关键词 ：重力远区地形改正, DEM网格间距, 地形改正精度, 改进的双线性插值

Abstract：

The 1∶50 000 gravity far area terrain correction is generally obtained from the 1∶50 000 DEM elevation model correction in the survey area. 1∶50 000 DEM can be spliced according to different grid spacings, which correspond to different terrain correction accuracies; RGIS is calculated by its own elevation database, and the topographic correction of 1∶50 000 gravity far area in the survey area is completed. The authors chose the 1∶50 000 gravity remote area I (2~20 km) land reform of Zangjiazhuang area in Qixia City, Shandong Province, as an example. Through the use of 25, 50, 100, 200 m four grid node spacings for 1∶50 000 DEM data splicing and the use of the improved bilinear interpolation method, the authors calculated the terrain correction and mean square error in the far area I of gravity. Compared with the terrain correction mean square error of gravity far area I of RGIS own elevation reservoir, it is confirmed that the terrain correction accuracy of gravity far-Ⅰ area based on 1∶50 000 DEM elevation model is better than that of gravity far-Ⅰ area with RGIS.

Key words： terrain correction in the far area of gravity DEM grid spacing terrain correction accuracy improved bilinear interpolation

收稿日期: 2020-01-15 出版日期: 2020-12-29

P631

基金资助:中国地质调查局地质矿产调查专项(FZK2016-4-166)

作者简介: 李忠平(1965-),男,硕士,高级工程师,从事矿产物探生产研究工作。Email:xjywt@163.com

引用本文:

李忠平, 戴广凯, 张茂辉. DEM网格间距对重力远区地改精度的影响及效果[J]. 物探与化探, 2020, 44(6): 1399-1407.
LI Zhong-Ping, DAI Guang-Kai, ZHANG Mao-Hui. The impact and effect of DEM grid spacing on the accuracy of gravity remote topographic correction. Geophysical and Geochemical Exploration, 2020, 44(6): 1399-1407.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2020.0013 或 https://www.wutanyuhuatan.com/CN/Y2020/V44/I6/1399

Fig.1 双线性插值法图示

Fig.2 改进的双线性插值法图示

Fig.3 山东烟台地区区域布格重力异常平面

Table 1 改进的双线性插值法试验计算对比

Table 2 不同网格间距重力远Ⅰ区地改精度统计

Fig.4 研究区地形

Fig.5 研究区构造及矿点分布
1—推测断裂; 2—压扭性断裂; 3—张性断裂; 4—韧性断层; 5—构造破碎带; 6—金矿脉; 7—钻孔

Fig.6 基于RGIS自带高程库中远区地改后布格重力异常

Fig.7 基于DEM改进的双线性插值中远区地改后布格重力异常

Fig.8 基于RGIS自带高程库布格重力异常和高程相关系数分布

Fig.9 基于DEM改进的双线性插值布格重力异常和高程相关系数分布

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[1]	张俊, 张宝松, 邸兵叶, 殷启春. 高程数据网格间距对重力中区地形改正精度的影响[J]. 物探与化探, 2014, 38(1): 157-161.

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