EFFECT OF INTERCEPTION ON THE BACKSCATTERING BEHAVIOUR FROM CROPS

摘要

Objective of this study is to systematically analyse and interpret the influence of interception on the backscatteringrnbehaviour from crops. The investigations were carried out using airborne E-SAR data at L-band recorded in June 2000.rnTwo different decomposition theorems – the eigenvector- and model based decomposition – were applied to the SARrndata. The polarimetric parameters derived by the eigenvector decomposition theorems showed no remarkable changesrndue to wetting of the plant surfaces. Only for the β-information significant variations were obtained. These changes arernhighly correlated to the variations of the radar backscatter at HV polarization, indicating an increase in volumernscattering processes under wet conditions. This is in agreement with the results obtained by the model basedrndecomposition theorem. Furthermore, the second approach signifies a decline in surface scattering and double bouncerninteractions when water on the plant surfaces is present. The greatest changes in backscattering due to moisture werernfound for high grassland, barley and rye.