Hello community. First please see this screenshot: http://i.imgur.com/x2dC4nd.jpg What I am trying to do is to map road conditions. I am referencing this paper: http://www.geogr.uni-jena...pping_heroldetal.pdf As they mentioned in the paper (page 11/15), they have used the band ratio 830/490. It seems I have got a very similar result as they have. However, as you can see they somehow introduced a color coded legend for the roads (everything else like trees and houses is still black&white representing the reflectance) I assume they have used some sort of ROI's or mask where they just mapped the roads, then created the color coded legend by using the data values of the band ratio calculation. How can I proceed to receive a similar result? I would like to introduce colour based on the reflectance data for the roads. I actually have known very good roads (which in my image they have value around 1.1-1.3, some 1.5+ unfortunately) and known very bad roads (which value are in the 1.6-1.8's) Thank you