PROCESSING OF ENVISAT ASAR WIDE SWATH IMAGERY FOR DERIVATION OFBIOPHYSICAL PARAMETERS OF SIBERIAN FOREST - A CONTRIBUTION OFTHE GERMAN AEROSPACE CENTER TO THE SIBERIA-II PROJECT

摘要

Wide swath imagery of the ENVISAT AdvancedSynthetic Aperture Radar (ASAR) may be used tostudy and map biophysical parameters of the Siberianforest. Within this study multi incidence-anglecapacities of the ASAR Wide Swath (WS) mode forderiving forest types and biomass parameters areassessed. For this purpose a processing chain was setup to manage orthorectify, calibrate and analyse largenumbers of WS-imagery in an automated way. Thegeocoding is based on DLRs EGEO system, derivinghighly consistent geometrically corrected imagery aswell as incidence angle matrices. Calibration tobackscatter values is implemented according to ESAsstandard calibration procedures published forENVISAT ASAR. After applying all required preprocessingand calibration, incidence angle signaturesof different forest types and biomass classes aregenerated and studied to assess biophysicalparameters of the Siberian forest.