Region Control Method Applied to Airborne Electromagnetic Data
详细信息
- 责任者：Guo Tao (Jilin Communications Planning and Design Institute ; Changchun 130021 ; China) ; Kong Xiangli
- 刊名：Geophysical and Geochemical Exploration
- 出版年：2013
- 卷期：37(2)
- 关键词：航空电磁法 ; aero-electromagnetic methods
- 页码：p.255-259
- 图表：illus., 15 refs.
- 分类号：1600
- issnNo：ISSN1000-8918
- isbnNo：CN11-1906/P
摘要
There are stripe errors in airborne electromagnetic data,which impart data quality.To remove this kind of errors,the general method is to separate the true field values and noise combining various window filters.Presently,the challenge for this method is the selection of window parameters and the problem that the data processors need more trails and errors to get appropriate parameters.In addition,the processing period is comparatively long.The region control method is put forward in this paper.Utilizing 2D-DDL(data dependent nonlinear) filters,the method takes the entire gridded airborne electromagnetic data matrix as a window,and obtains the background of the whole region.As the control points of entire region,the background of the whole region is used to adjust the local background obtained by small window 2D-DDNL filtering,which is called automatic window parameter adjustment.As a result,the local background is adjusted to suit the control point of the entire region background.The differences between the backgrounds and raw data are middle variables composed of local geological anomalies and stripe errors.The adapted median filter is used to separate stripe errors,and the leveling results finally come out.This method can automatically adjust the size of window,reduce the human interference,and preserve useful geological information comparatively.