Title :
An Angular Index to Indicate Surface Heterogeneous Behaviors from MODIS
Author :
Jiao, Ziti ; Schaaf, C.B. ; Gao, F. ; Strahler, A.H. ; Li, X. ; Wang, J. ; Liu, J.
Author_Institution :
State Key Lab. of Remote Sensing Sci., Beijing Normal Univ., Beijing
Abstract :
An anisotropic flat index (AFX) is among the operational BRDF and albedo products offered in both the V004 and V005 reprocessed versions. We examine this BRDF shape indicator with 20 ground multiangular data sets as well as MODIS satellite samples, and find that the AFX routinely captures the BRDF shape. An AFX < 1.0 indicates a dome shaped anisotropic pattern with prominent backscatter peak reflectances, and strong retro solar view angle (hotspot) maximum reflectances; an AFX = 1.0 approximately indicates a Lambertian surface; and an AFX > 1.0 corresponds to a bowl shaped anisotropy pattern. For green vegetation, the BRDF shape is related to canopy architecture. Therefore, the behavior of the AFX provides an opportunity to infer canopy structure of the surface cover that produces the anisotropic effect.
Keywords :
albedo; atmospheric boundary layer; remote sensing; vegetation; BRDF shape; Lambertian surface; MODIS satellite; V004 reprocessed version; V005 reprocessed version; albedo products; anisotropic flat index; anisotropic pattern; backscatter peak reflectances; canopy structure; green vegetation; retro solar view angle; surface heterogeneous behaviors; Anisotropic magnetoresistance; Geography; Kernel; MODIS; NASA; Parameter estimation; Remote sensing; Scattering; Shape; Vegetation mapping; Anisotropic Flat Index; BRDF; BRDF shape indicator; MODIS; Vegetation structure;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 2008. IGARSS 2008. IEEE International
Conference_Location :
Boston, MA
Print_ISBN :
978-1-4244-2807-6
Electronic_ISBN :
978-1-4244-2808-3
DOI :
10.1109/IGARSS.2008.4779462
