STUDY ON RELATION BETWEEN INSAR COHERENCE AND SOIL MOISTURE

Coherence is an important parameter to measure InSAR data quality in repeat-pass interferometry and soil moisture change can cause de-correlation. Relation between coherence and soil moisture was examined in this paper by using the ERS-1 interferometry pairs on Cangzhou area for which there are some heavy rain between the acquisition dates of the two images. The soil moisture is obtained based on the distributed hydrological model and the coherence is calculated by reducing the other de-correlation factors as much as possible. Correlation and regression analysis are carried out on the two images. It is found that the relation between the two may satisfy exponential distribution and is different with the area. Different soil types and land use appear different patterns.