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Abstract A linear mixing model was applied to coarse spatial resolution data from the NOAA Advanced Very High Resolution Radiometer. The reflective component of the 3·55-3·95 μm channel was used with the two reflective channels 0·58-0·68 μm and 0·725-1·-1 μm to run a Constrained Least Squares model to generate fraction images for an area in the west central region of Brazil. The fraction images were compared with an unsupervised classification derived from Landsat TM data acquired on the same day. In addition, the relationship between the fraction images and normalized difference vegetation index images show the potential of the unmixing techniques when using coarse spatial resolution data for global studies.
Holben et al. (Thu,) studied this question.