Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: February 10, 2002
Publication Date: March 7, 2002
Citation: Hunt, E.R. 2002. Leaf area index and cover of short grass steppe using AVIRIS Imagery [abstract]. In: 2002 AVIRIS Earth Science and Applications Workshop Abstracts, March 5-8, 2002, Pasadena, California.
AVIRIS data were acquired on two dates (25 July 1995 and 6 August 1998) over the USDA ARS Central Plains Experimental Range (CPER) near Nunn, Colorado. For a long term grazing intensity experiment (light, medium, heavy), NDVI were equal among treatments for both years; there was no relationship between NDVI and LAI even though LAI's were less than two. Endmember mixture analyses showed the green cover fraction was equal to th measured cover and the shadow cover fraction was equal to the shrub cover. Application of mixture models to reflectances of stacked leaves confirm NDVI is primarily responsive to differences in green cover and secondarily to LAI.