Remote sensing at ITC-irst - MPBA group

MODIS NDVI/EVI Vegetation Index

Software used: GRASS 5.7, GRASS6, GDAL

Alps MODIS NDVI example (16 days composite)

The following preprocessing steps are required to obtain usable NDVI/EVI maps from MOD13:

• reprojection from SIN to a commonly used projection
• application of the quality maps (requires pixelwise bitpattern analysis) - this is an essential step!
• division by 10000.0 to get back the range from -1.0 .. +1.0
• elimination of pixel with value outside of that range
• application of color table

Perspective view of Alps MODIS NDVI example (16 days composite)

Comparison of NDVI and EVI performance

Both NDVI and EVI maps are colored with identical color table (MODIS/Terra scene MOD13, composite of 21 March - 5 April 2000, Calabria, Southern Italy). EVI is less prone to atmospheric distortion (see ATBD below). Both maps have been processed according to the list shown above.

See also:

• mod13q1v4 documents
• Algorithm Theoretical Basis Document (ATBD) (PDF)
• MODLAND NDVI/EVI Product Description