HEC to GIS grid import error questions

[Anonymous]

I completed a steady flow model on a tributary and its floodplain (to look at potential off-channel salmon habitats at 3 varied flows). I imported the model back into GIS, began the inundation mapping, and completed the water surface generation TIN. Then trying to do the floodplain delineation using the same model grid I inputted to start the GeoRAS data prep, I get an error message: Error 010316: unable to open input raster and then Error: 010067: Error in executing grid expression.

These numbers offer no clarity from ArcGIS help. My raster GRID appears to be fine. Its not in a geodatabase, but is a standalone DEM raster. 2m sq pixels from a 2006 lidar data set. Any clues about the problem? Do I have to change the raster grid into a TIN so GeoRAS can turn it back into a raster (this seems odd)? Should I aggregate the input raster to 20m sq pixels similar to the pixel size it normally outputs when GeoRAS converts from TINs to rasters? Other suggested work-arounds? Thanks in advance.

[soroush]

Hi Chris

I have exactly the same problem for two or 3 weeks. Did you find the solution? I appreciate your response.

Thanks

[Vince Moody]

Soroush,

Have you tried using RAS Mapper to generate your inundation maps? It’s much more stable and user friendly than the cumbersome export to GeoRAS. You can even export grids to a stand-along raster, which you can open and view in GIS if needed.

[soroush]

Thanks Vince for your comment. I have not tried it, because I need to see flooding maps in ArcGIS; and I though transferring from Ras mapper to GIS would be another scenario.

If it is not a hard issue, maybe I should start that.

Thanks

[Author]

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