schignel

Formula for Enhanced Vegetation Index (EVI) in Raster Calculator?

Discussion created by schignel on Feb 27, 2013
Latest reply on Jul 26, 2017 by lpinner
Hi everyone,
I'm trying to derive Enhanced Vegetation Index (EVI) from Landsat 5 TM data using the raster calculator and I can't seem to get the output I want. Here is a link to the description and formula for EVI:

http://en.wikipedia.org/wiki/Enhanced_vegetation_index


The output should be a raster with values ranging from -1 to 1, but I get values from like 30-40 which is incorrect.

Right now my formula looks like this:


2.5 * (Float("%Band 4%" - "%Band 3%") / Float("%Band 4%" + 6 * "%Band 3%" - 7.5 *"%Band 1%" + 1))


Does anyone see something in here that doesn't make sense-- or even better--a formula I could copy/paste?

Thanks!

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