Improvement of DEM quality derived by interferometric SAR by using multiple baseline data pairs
Abstract
According to the study conducted by the authors on DEM generation by using InSAR with many JERS-1/SAR repeat-pass interferometric data pairs with different baseline lengths, it has been suggested that height accuracy and drawback rate are correlated to baseline better than to coherence. The drawback rate clearly decreases with smaller baseline lengths, and on the other hand, height accuracy tends to decrease with smaller baseline lengths and the range from 400 to 500 m in baseline lengths brings in the best accuracy, although the drawback rate is generally larger than that with smaller baseline length. These experimental results clearly indicate that it is basically impossible to obtain the best accuracy and drawback rate at once by a single repeat-pass data pair. One possible approach might be the use of multiple InSAR data pairs. Therefore, the authors attempt to improve the quality of DEM generated by L-band repeat-pass InSAR by using multiple InSAR data pairs with different baseline lengths. The multiple interferometric data pairs by JERS-1/SAR repeat-pass observation with different baseline lengths are used to generate DEM in several mountain test areas in Japan. After DEM generation by individual data pairs, they are merged into a final DEM product based on the regression analysis of them. The result indicates that the use of multiple baseline data pairs significantly improves DEM quality with a little increase of height error.
- Publication:
-
35th COSPAR Scientific Assembly
- Pub Date:
- 2004
- Bibcode:
- 2004cosp...35.1488T