GEOSCAN Search Results: Fastlink


TitleTemporal Analysis of ERS-1 SAR Backscatter for Hydrology Applications
AuthorCrevier, Y; Pultz, T J; Lukowski, T I; Toutin, Th
SourceCanadian Journal of Remote Sensing 22, 1, 1996 p. 65-76,
Alt SeriesEarth Sciences Sector, Contribution Series 20041468
PublisherInforma UK Limited
Mediapaper; on-line; digital
File formatpdf
Released2014 07 31
AbstractA series of 12 ERS-1 SAR scenes are used to examine the effects of environmental conditions and human disturbance on radar backscatter from a variety of land cover targets of particular interest to hydrological applications. Imagery covering the Ottawa region was acquired for the period of July 1992 through July 1993. This dataset was radiometrically calibrated using software developed at CCRS. The calibration process is essential for comparing the radar backscatter of bare fields, pastures, wetlands, and forests in the 12 images. A precise geometric correction method was also applied to the multi-date images. In addition, a Landsat Thematic Mapper image was used to extract the training areas that are representative of the land cover classes. Descriptive statistics (mean, standard deviation) are extracted from the ERS-1 SAR images for each land cover class. These statistics are used to generate temporal signatures. Associated meteorological data and ground information are used in the interpretation of backscatter response. It is observed that bare fields and pastures are the surfaces that best reflect changes in soil moisture and the presence of frost in the soil. The backscatter of wetlands appears more sensitive to frost than to changes in moisture. We also observed that the forest cover temporal signature is constant despite changes in moisture due to precipitation or temperature.

Date modified: