Title :
Modeling the bidirectional reflectance for a semi-arid landscape
Author_Institution :
Raytheon, Lanham, MD, USA
Abstract :
A model for the bidirectional reflectance over soils is coupled into a vegetation model to predict the bidirectional reflectance of a semi-arid landscape. The vegetation model is a hybrid of geometric optical and radiative transfer (GORT) model for the bidirectional reflectance over discontinuous plant canopies. The coupling is done by extending the assumption of Lambertian background in the GORT model into a non-Lambertian soil background described by Hapke´s soil BRDF model. The model is validated with POLDER and AVHRR imagery collected in a semi-arid site during the Jornada PROVE´97 campaign with good accuracy. It is a very simple but analytical model for bidirectional reflectance over a semi-arid landscape and has the potential for surface parameter retrieval for the study of biosphere-atmosphere interaction
Keywords :
geophysical techniques; light scattering; terrain mapping; vegetation mapping; BRDF; GORT model; Lambertian background; bidirectional reflectance distribution function; desert; discontinuous canopy; geometric optical model; geophysical measurement technique; land surface; light scattering; model; nonLambertian model; optical imaging; radiative transfer model; remote sensing; semi-arid landscape; soil; terrain mapping; vegetation; Analytical models; Bidirectional control; Geometrical optics; Land surface; Optical scattering; Reflectivity; Satellites; Soil; Solid modeling; Vegetation mapping;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 1999. IGARSS '99 Proceedings. IEEE 1999 International
Conference_Location :
Hamburg
Print_ISBN :
0-7803-5207-6
DOI :
10.1109/IGARSS.1999.773513
