Title :
A comparison of NDVI and spectral mixture analysis for estimating biophysical properties in boreal forest terrain
Author :
Peddle, Derek R. ; Hall, Forrest G. ; LeDrew, Ellsworth F.
Author_Institution :
Dept. of Geogr., Waterloo Univ., Ont., Canada
Abstract :
Spectral mixture analysis is used to determine scene fractions of sunlit canopy, background, and shadow, which are compared to NDVI in terms of their relation to the biophysical parameters LAI, biomass and NPP. In all tests, the mixture fractions outperformed NDVI by large margins, with shadow fraction having an r2=0.80 compared to 0.47 for NDVI. Solar zenith angle was an important factor in determining input component reflectance values for mixture analysis. The physical basis for these improvements is the sensitivity of mixture fractions to tree size and morphology
Keywords :
forestry; geophysical techniques; remote sensing; LAI; NDVI; NPP; background; biomass; biophysical properties; boreal forest terrain; forestry; geophysical measurement technique; mixture fractions; morphology; optical imaging; remote sensing; scene fractions; shadow; solar zenith angle; spectral mixture analysis; sunlit canopy; tree size; vegetation mapping; Biomass; Geometry; Layout; Performance analysis; Physics; Productivity; Reflectivity; Solid modeling; Spectral analysis; Testing;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 1996. IGARSS '96. 'Remote Sensing for a Sustainable Future.', International
Conference_Location :
Lincoln, NE
Print_ISBN :
0-7803-3068-4
DOI :
10.1109/IGARSS.1996.516300
