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

Volume

3

fYear

2008

fDate

7-11 July 2008

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/IGARSS.2008.4779462

Filename

4779462