Skip all navigation and jump to content Jump to site navigation
NASA Logo - Goddard Space Flight Center

+ NASA Homepage

Goddard Space Flight Center
About MODIS News Data Tools /images2 Science Team Science Team Science Team

   + Home
MODIS Publications Link
MODIS Presentations Link
MODIS Biographies Link
MODIS Science Team Meetings Link



Trigg, SN, Roy, DP, Flasse, SP (2005). An in situ study of the effects of surface anisotropy on the remote sensing of burned savannah. INTERNATIONAL JOURNAL OF REMOTE SENSING, 26(21), 4869-4876.

This Letter presents field-based evidence of the perturbing effects of surface anisotropy on the remote sensing of burned savannah. The analysis is based on bidirectional spectral reflectance data collected at different solar illumination angles and convolved to Moderate-resolution Imaging Spectroradiometer ( MODIS) reflective bands. Results from a grass savannah site show that burning reduces the anisotropy of the surface compared to its pre-burn state. In contrast, at a shrub savannah site, burning reduces or increases surface anisotropy. Spectral indices defined from 1.240 mu m and 2.130 mu m reflectance, and 1.640 mu m and 2.130 mu m reflectance, provided stronger diurnal separation between burned and unburned areas than individual reflectance bands but do not eliminate anisotropic effects. The Normalized Difference Vegetation Index (NDVI) provides weak diurnal separation relative to these near- and mid-infrared based indices. Implications of the findings are discussed for burned area mapping.



FirstGov logo Privacy Policy and Important Notices NASA logo

Curator: Brandon Maccherone
NASA Official: Shannell Frazier

NASA Home Page Goddard Space Flight Center Home Page