PRECISION ESTIMATION AND GEOMORPHOLOGICAL ANALYSIS OF DEM OF DAMXUNG-YANGBAJAIN TIBET ACQUIRED BY InSAR

Accurate digital elevation model (DEM) can be produced by using interferometric SAR data. The interferometric processing and analyses are carried out for the test area of Damxung-Yangbajain in Tibet using one couple of ERS-1/2 tandem SAR images acquired on April 6, 1996, and on April 7, 1996, respectively. And a portion of the interferometrically derived DEM is selected and compared with the 1:50,000 DEM. The evaluation on precision is made along with analysis of its potential limitation factors. It is confirmed that InSAR can be used to produce more products to complement the dangerous field surveying. And for Tibet investigation, InSAR is also an effective tool in studying geodynamics and geomorphological changes by adopting more pairs of radar image data. Key words: synthetic aperture radar interferometry; tandem; DEM; Precisio