摘要
航空重力地形改正是获得航空布格重力异常的重要环节,是航空重力勘探数据处理中的重点和难点问题。本文针对航空重力特点,分析了地改最大半径的选择与地形特点及计算精度的关系。为满足大数据量网格数据的计算要求,对全分辨率地形剖分方法、远近分区地形剖分方法、自适应四叉树地形剖分方法对航空重力地形改正计算的产生影响进行了对比。其中自适应四叉树地形剖分法可以对地形网格距离和高程进行综合考虑,达到最佳分辨率的地形剖分,既保证计算精度,又提高运算速度。
The terrain correction is one of the important steps to get airborne gravity Bouguer gravity anomaly; nevertheless,the tackling of the problem has a lot of difficulties and troubles. So it is significant to study the terrain correction of airborne gravity. Considering the characteristics of airborne gravity,the authors analyzed the relationship between the selection of the maximum radius in the terrain correlation and the calculation accuracy. In order to meet the requirements of an amount of grid data,the authors made a comparative study of the total resolution terrain partition method,the far and near partition method,and the adaptive quadtree method. The adaptive quadtree method can comprehensively consider the distance and elevation of the terrain cell,realize the best resolution of the terrain,and pick up the calculation speed without the loss of accuracy.
出处
《物探与化探》
CAS
CSCD
2015年第B12期113-118,共6页
Geophysical and Geochemical Exploration
基金
国家高技术研究发展计划("863"计划)项目(2011AA060501)
关键词
航空重力
地形改正
最大地改半径
快速算法
airborne gravity exploration
topographic and terrain correction
correction radius
rapid calculation method in terrain correction
