Interpolation and Fractal Concentration-Area C-A Method

The MIDW (Cheng, 2003) interpolation method estimates the distribution of chemical values based on fitted power law trends between chemical values and the 

To decompose the MIDW interpolated map to obtain background/baseline and anomaly maps, a fractal filtering technique, named spatial and spectral analysis or simply (S-A) method, is applied. 

In theory decomposing the MIDW interpolated map, background and anomaly maps should be obtained but, often happens that the background map shows areas where concentration values are still affected by contaminations and they should hence be interpreted as baseline values. 

The S-A method is based on a Fourier spectral analysis (Cheng, 2001 1999). It uses both frequency and spatial information for geochemical map and image 

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Multifractal Interpolation and Fractal Concentration-Area (C-A) Method 137... 

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