I'm trying to calculate slope based from a national DEM - USGS 3D Elevation Program (3DEP), found here: 3DEPElevation (ImageServer) - and am having trouble with the spatial analyst geoprocessing tool given the size of the raster. When I try calculating slope in ArcMap Desktop, I get an error message saying that the file is too large. When I use ArcGIS Pro, it processes up to 5% and then stops. I'm using a VM, so bandwidth is not the issue. Does anyone have any tips on processing national DEMs? Or are there any pre-processed national slope files out there that I could download?
I ran into the same sort of problem recently trying to process just one county worth of imagery. I cannot imagine the cpu and and memory (and probably graphics memory too) to complete a full country. Is there a way you can get the data into manageable chunks?
All of the other DEMs that I've found are at county-level or similar, which would be a hassle to patch together at the end. Unfortunately, I need a national slope raster to conduct analyses!
Are you sure you need full resolution on this? Bandwidth may not be an issue, but processing zillions of cells with any neighborhood operator is just a LOT of data to process. Even if you downloaded tiles on the data it would take you weeks I'm sure.