Document Details

Document Type : Article In Journal 
Document Title :
Evaluation of the Efficiency of Shortened Low-Pass Filters Computed by Inverse Fourier Transform for Potential Fields of Spherical Bodies and Planar Regionals
تقويم كفاءة مرشحات المرور الخفيض المقصرة المحسوبة بواسطة تحويل فوريير العكسي لمجالات الجهد للأجسام الكروية والإقليميات المستوية
 
Subject : Earth Sciences 
Document Language : English 
Abstract : The purpose of a separation filter may be defined as suppressing deep-rooted anomalies and faithfully reproducing shallow-rooted ones. Such separation could be performed by the transformation of gridded data using a set of coefficients computed by numerical evaluation of the Inverse Fourier Transform of the filter matrix. A residual field due to an arbitrary spherical structure is chosen for testing and evaluating this method for obtaining a shortened matrix. The spherical model and planar regional are used merely due to the simplicity of calculations. The efficiency of the low pass filter is statistically computed and measured by the normalized residual root mean square (nrrms) between the theoretical and filtered fields. The efficiency of filtering, due to different low pass filter parameters and matrix sizes, has been studied. Various inter-relationship curves, concerning the regionalization parameter (Q), matrix length (M), and depth to the causative body (Z), have been constructed for choosing a matrix which approximates the theoretical filter response best. It was found that the choice of a low pass filter (smoothing) parameter of Q = 60 and a matrix length of M = 21 is a compromise between the practical matrix size and the required efficiency of the low pass filter at different depth units (Z). It is also con- : cluded that filter parameters and matrix lengths suitable for separation of r deep spherical local bodies are efficiently used for shallower ones 
ISSN : 1012-8832 
Journal Name : Earth Sciences Journal 
Volume : 1 
Issue Number : 1 
Publishing Year : 1408 AH
1988 AD 
Number Of Pages : 15 
Article Type : Article 
Added Date : Sunday, October 11, 2009 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
أحمد أبو بكر باعمارAHMED A. BA-AMMARResearcher  
قدري محمد فؤاد KADRY M. FOUADResearcher  
مجدي لوقا مليك MAGDY L. MELEIKResearcher  

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