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Anybody here can help me regarding calculating Vegetation Condition Index (Kogan,2004) for Landsat?. Specially facing problem in NDVI_max and NDVI_min; which should be maximum and minimum value?

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Kogan (2004) (p. 2891) provides the following formula for the Vegetation Condition Index (VCI):

VCI = 100 * (NDVI - NDVImin) / (NDVImax - NDVImin)

where,

NDVI = Smoothed weekly NDVI value  
NDVImin = Multiyear minimum NDVI value  
NDVImax = Multiyear maximum NDVI value

As you know, NDVI ranges from -1 to 1 and functionally ranges from 0 - 1. VCI rescales this to 0 - 100.

You can put this formula into practice by using raster algebra in your favorite GIS.

  • Thank you very much. Should I reclassify the NDVI values 0 to 1 from the main scene? – user48079 Dec 25 '15 at 7:42
  • No, you should not reclassify the NDVI. – Aaron Dec 25 '15 at 15:30

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