jscrase

Longest Flow Path for Catchments Problems

Discussion created by jscrase on Oct 7, 2013
Latest reply on Oct 9, 2013 by cdartiguenave-esristaff
I have progressed through the Terrain Preprocessing toolbox, from DEM Reconditioning through to Adjoint Catchment Processing, on a DEM sized at 6,587x12,522 30m cells (320mb). However, I am coming unstuck at the Longest Flow Path for Catchments, where the software fails with an error message getting at available memory alloctaion.

I have tried most of the tips and tricks found within this forum (i.e. clearning temporary workspace, increasing Raster rendering allocation, disabling background processing, etc) but with no luck. I think it is due to the large number of catchments I am trying to generate stats for (> 10,000).

Can anyone out there advise on how best to subdivide the data/model to get this information (longest flow paths) out. Utlimate aim is to identify adjoint catchments over 10km2 threshold as providing cumulative catchment areas, and assigning longest flow paths and average basin slope for each of these adjoint catchments? I have read somewhere that it is possible to divide for regional based analysis, but can find no help on how one would go about this.

Any help would be greatly appreciated.

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