Does anybody know how to calculate aspect with the Raster Calculator? I have a 10 meter, GRID, floating point DEM that I downloaded from the USGS. I can easily calculate using the Aspect Geoprocessing tool, but this will not work well for true quantitative analysis. I would like to to be able to generalize aspect by categorizing the aspects into 4 categories, N, S, E, and W.
I would like to convert aspects from 315.1?? to 45?? = N, 45.1?? to 135?? = E, 135.1?? to 225?? = S, 225.1?? to 135 = W. I am pretty certain there is an expression that allows you to perform this transformation but have not been able to find anything on line and am not completely familiar with the raster calculator expressions.
If anybody has experience with this or suggestions on how to go about doing this, I would be extremely grateful. Thank you so much.
I am not quite clear on what you mean by "it doesn't work". I ran aspect on a raster dataset, and used the image attached for inputs for Reclassify tool. Seems to function correctly. Note: I did not include a class for flat. (I used the Classify tool within this dialog to create the old value classes). Regards, Jim