Testing and evaluation of permanent scatterers candidates selection methods

This paper develops a method to evaluate the accuracy of permanent scatterers selection by using the proportion from the number of lines in the initial PS network to the number of lines in the refined PS network. Taking advantage of this method, two main PSC selection methods: amplitude dispersion method and coherence method were tested using 20 Envisat ASAR acquisitions. The results show that, when the number of image is more than 11, the permanent scatterers candidates selected by amplitude dispersion method is more accurate than the ones selected by coherence method, the opposite conclusion can be drawn when the number of images is less than 11. The results are consistent with the conclusions drawn by other qualitative analysis, which prove the method developed in the paper is effective.