In ArcGIS for Desktop I have to Derive and symbolise areas considered susceptible to avalanche risk based on the following simple rules:
- areas with a slope between 20 and 45 degrees,
- facing towards the prevailing wind (west in this case)
- not in forested areas.
By far I manage to display the Slopes and Aspects using tools from Spatial Analyst.
But how I can display the slopes in 3 different categories where they all facing west?
Photo attached shows what I manage to come up with