I am trying to run ArcGIS 10.1 flow accumulation on a 10000 x 10000 cell unsigned 8Bit integer flow model (but 80% of that is no data). The data has been through a "fill" procedure once.
The only unusual aspect is that I have inverted the DEM, so the water flows from 0 into negative values.. could be an issue??
The model has been running for 24 hours, but while ArcGIS claims it is processing, the GPU shows no activity and the output file is empty.
My machine is a 2Ghz quadcore, 64 bit Win7 OS. How long might I expect this to run, and is there anyway to tell if it is working at all?