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I am working on differentiating cocoa plants from other vegetation types using 4 epoch bwt 1980-2010. I need to extract the spectral signature for cocoa plants and other known features. I plan using landsat or MODIS imagery. How can I do this using either ArcGIS, Erdas, Envi or Idrisi?

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    Welcome to the site! Could you please edit your question and define "4 epoch bwt 1980-2010"? – Aaron Dec 13 '14 at 23:19
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Draw polygons with ArcGIS. The polygons are areas with a specific type of vegetation. You have some areas FROM Landsat 7 and MODIS. You want to "export" the spectral signature of these areas. With ArcGIS you can use "zonal statistics as a table" to extract the mean spectral values for each band and within your polygon. You can run it in batch mode (right click on the tools > batch) to have the values related to each band of each satellite.

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