衛星搭載合成開口レーダによる流域地表面特性の把握に関する基礎的検討

Abstract

This paper reports characteristics of synthetic aperture radar (SAR) imageries obtained by two new satellites the European Remote Sensing Satellite (ERS-1) and the Japanese Earth Resources Satellite (JERS-1).The authors compare the SAR imageries in terms of distributions of the CCT values and the backscattering coefficients for several kinds of land cover in a watershed near Nagoya, Japan. The results show:(1) Water areas (channel networks) are able to be extracted using the SAR images, and it is better to use the ERS-1 SAR image than to use the JERS-1 SAR image.(2) Except water areas, to identify boundaries clearly between various land cover is difficult by use of the ERS-1 SAR image and the JERS-1 also.(3) The mean values of backscattering coefficients computed from the JERS-1 SAR image show larger values in the order, water areas, paddy fields, forests, urban areas. This order corresponds the order in which the value of the aerodynamic roughness parameter for each land cover becomes larger.(4) The estimation of the aerodynamic roughness parameter by making use of a SAR image would be possible.