Title :
A discrete model to evaluate vegetation effect in passive microwave soil moisture retrieval
Author :
Zhang, Zhongjun ; Sun, Guoqing ; Zhang, Lixin
Author_Institution :
Dept. of Geogr., Beijing Normal Univ., China
Abstract :
A discrete vegetation model to calculate the brightness temperature of vegetation-covered soil surface in passive microwave soil moisture for AMSR-E was developed. In this model, vegetation canopy consists of discrete scatters such as leaves, stems, branches with various sizes and orientations. A Matrix Doubling algorithm is used for vegetation layer, so the multiple scattering within the canopy could be accounted for. The surface scattering was modeled by IEM algorithm. Preliminary results show the emission from soil is dominant, the vegetation mainly acts as an absorption layer, and among all of the vegetation parameters, canopy height and water content is the most important factor in affecting soil emission.
Keywords :
backscatter; hydrological techniques; microwave measurement; moisture; soil; vegetation mapping; AMSR-E; IEM algorithm; absorption layer; brightness temperature; canopy height; discrete scatters; discrete vegetation model; matrix doubling algorithm; multiple scattering; passive microwave soil moisture; soil emission; surface scattering; vegetation canopy; vegetation covered soil surface; vegetation layer; vegetation parameters; water content; Azimuth; Brightness temperature; Dielectrics; Geography; Optical scattering; Passive microwave remote sensing; Rayleigh scattering; Soil moisture; Surface treatment; Vegetation;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 2003. IGARSS '03. Proceedings. 2003 IEEE International
Print_ISBN :
0-7803-7929-2
DOI :
10.1109/IGARSS.2003.1294101
