To separate the vegetated area from non-vegetated area we are supposed to use empirically determined threshold value. So how to determine threshold value empirically?
You should classify the images on the basis of :
a) Vegetation
b) Non Vegetation
In False Color Composite, vegetation is generally reddish in color. The DN values will help to get the threshold.
And, do a NDVI calculation on the image, and you get results for vegetation and non-vegetation, for validating the above process.
Take a look at this paper (and R-package)
Freeman, E. A. and Moisen, G. (2008). PresenceAbsence: An R Package for Presence-Absence Model Analysis. Journal of Statistical Software, 23(11):1-31. http://www.jstatsoft.org/v23/i11
just go through the attachment in these paper they have calculated threshold value empirically
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