Measuring land subsidence by PALSAR Interferometry in Yanzhou coal mine area

摘要

In this paper, we used PALSAR data to measure the land subsidence in Yanzhou coal mining area based on InSAR technique. Firstly it simply analyzed InSAR technique and introduced some orbital radar satellites for InSAR measuring. It introduced the PALSAR data for test and the selection of InSAR pairs. Then it illustrated the procedure of 2-pass D-InSAR data processing taking true data for example. It can be divided into inteferometric processing, simulating the interferogram according to DEM, differential processing and filtering, phase unwrapping, conversion of deformation. Then it got the deformation map of coal mining subsidence. It interpreted and analyzed the D-InSAR results in details. It generated the isoline maps of land subsidence in coal mining area. We found that the maximum land subsidences in vertical direction in two areas are up to 51.8 and 71.4 cm in 46 days. The test proves that PALSAR and SRTM DEM data are suitable for monitoring the land subsidence in areas with vegetated land cover, such as coal mining area.