RESPONSE OF SPOT SATELLITE IMAGE SPECTRA TO CITRUS CANOPY SIZE

A need exists for improving satellite-based land-use classifications t o meet the increasing demand for better quality and greater details of agricultural land-use data. The effect of citrus canopy on the French Systeme Probatoire de l'Observation de la Terre (SPOT) satellite resp onse was investigated. The spectral responses of the SPOT green, red, near-infrared (NIR), and panchromatic wavebands to citrus canopy cover s were analyzed by regression techniques. The effect of citrus canopy on SPOT satellite data was evident, indicating a potential improvement on citrus land-use classifications. Among the four wavebands, the red waveband had the highest r2 value (0.84), and thus is the best for di stinguishing citrus canopy covers. The spectral responses of all but t he NIR wavebands were inversely related to citrus canopy size. In addi tion, a photogrammetric approach for the estimation of citrus canopy w as also presented.