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Here are web resources that provide information about drought monitoring using remote sensing. This list is not all inclusive.
National Drought Mitigation Centerhttp://drought.unl.edu
Vegetation Drought Response Index (at National Drought Mitigation Center)http://vegdri.unl.edu
National Integrated Drought Information System http://www.drought.gov/drought
Measuring Vegetation (NDVI & EVI)http://earthobservatory.nasa.gov/Features/MeasuringVegetation
Global and Regional Vegetation Healthhttp://www.star.nesdis.noaa.gov/smcd/emb/vci/VH/index.php