I have a DEM generated from Lidar (tens of gigabytes in size) even when cropping it down to the minimum required size, which makes it a beast to work with and reducing resolution isn't an option. I am using the Add Surface Information tool to calculate mean Z values for a grid (hundreds of thousands of polygons), and the tool takes days to complete its run even on a fairly robust computer (12 core 3.5 Ghz, 64 Gb RAM, all data is on an SSD drive). Is three a faster/more efficient way to get this done?
