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Agricultural Drought Indices - US Department of Agriculture

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References<br />

Gu, Y., J. F. Brown, J. P. Verdin, and B. Wardlow. 2007, A five-year analysis <strong>of</strong> MODIS NDVI and<br />

NDWI for grassland drought assessment over the central Great Plains <strong>of</strong> the United States,<br />

Geophys. Res. Lett., 34.<br />

Link: http://drought.unl.edu/pubs/documents/wardlow%20GRL%202007.pdf<br />

R. N. Clark, G. A. Swayze, R. Wise, K. E. Livo, T. M. Hoefen, R. F. Kokaly, and S. J. Sutley. 2007,<br />

<strong>US</strong>GS Digital Spectral Library splib06a, U.S. Geological Survey, Data Series 231.<br />

Link: http://speclab.cr.usgs.gov/spectral.lib06/<br />

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