Wavelet transform in denoising magnetic archaeological prospecting data
B. Tsivouraki, Gregory N. Tsokas · Archaeological Prospection · 2007
Abstract Magnetic measurements in archaeological prospecting are often affected by cultural noise having the same high‐frequency content as anomalies arising from buried antiquities. Also, in many cases the microrelief of the ground surface causes a noise that is coherent, pseudorandom and periodic. The main cause of this kind of noise is the ploughing of the earth. In this paper the efficiency of a wavelet denoising scheme is tested with respect to these types of unwanted disturbances. The proposed scheme combines the cyclospinning algorithm with a variable threshold calculated in each cycle of the algorithm. Tests on synthetic and real data show a satisfactory performance of the technique in suppressing both the white noise and the coherent noise caused by the systematic undulations of the ground surface. Copyright © 2007 John Wiley & Sons, Ltd.