Help with change detection

Discussion created by mkak1 on Dec 9, 2013
Hi Guys,

I am a new to use ARGIS , and I need to apply change detection methods. I have three landsat images 1990 -2000 and 2013 and
I need to evaluate the urban changes during the past 20 years.
I have done Image differencing for the 1990 and 2000 images using ARCGIS 10.1, I had a raster images with values from 213 to -69.
My question is that how I can calculate the changes in the urban areas? is what I have done is right so far?

your help guys is much appreciated!