Submitted to: Jet Propulsion Laboratory Airborne Earth Science Workshop
Publication Type: Proceedings
Publication Acceptance Date: April 12, 2002
Publication Date: February 27, 2003
Citation: Hunt, E.R., 2003. Leaf area index and cover of shortgrass steppe using AVIRIS imagery. In: Proceedings of Jet Propulsion Laboratory Airborne Earth Science Workshop. 03-4(163-170).
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 the 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.