I have converted a dxf file with contour lines into a polyline shapefile, and I have used the Raster Analysis plugin to create a grayscale slope map from this shapefile. I would now like to have different colors for this shapefile according to different slope percentages (or/and degrees). I am an urban planner and this makes it easy to define places which are easier and safer to build. For instance: Green: 0-20% Yellow: 20-29% Red: 30-39% Purple: 40-100%
I have tried to change the colors in the slope tif layer properties but have been unable to understand how to do that. Is it possible? I know that it is for relief maps and color according to elevation but haven't found similar information about slope. Any help and if possible step by step instructions would be greatly appreciated.