Error Trapping: ArcHydro LongestFlowPath

PeterWilson — Mon, 20 May 2013 16:38:15 GMT

I've a very large model where I'm processing 650 watersheds. My model is failing when trying to generate the longest flow paths for the 650 watersheds. I would like to trap the individual watersheds that are causing the longest flow path to fail, report the hydroID and continue the the rest of the watersheds at least. I can always go back to look at the watersheds that throw an exception to see whats causing the the tool to fail.

import arcpy, ArcHydroTools
watshed = r'E:\Projects\H109355_2\ArcHydro\Model3\Nigeria03.gdb\Layers\Watershed'
fdr = r'E:\Projects\H109355_2\Archydro\GRID\layers.gdb\Fdr'
ArcHydroTools.LongestFlowpath(watshed,fdr,r'E:\Projects\H109355_2\ArcHyro\Model3\Nigeria03.gdb\Layers\LongestFlowPath')

I've tried the following approach, but over write output doesn't work:

import arcpy, ArcHydroTools
outpath = arcpy.env.workspace = r'E:\Projects\H109355_2\ArcHydro\Model3\Nigeria03.gdb\Layers'
arcpy.env.overwriteOutput = True
fdr = r'E:\Projects\H109355_2\ArcHydro\GRID\Layers.gdb\Fdr'
watshed = "Watershed"
with arcpy.da.SearchCursor(watshed,("Name",)) as scur:
    for row in scur:
        cuindex = row[0]
        sqlexp = """{0} = '{1}'""".format(arcpy.AddFieldDelimiters(watshed,"Name"),cuindex)
        watshedind = arcpy.FeatureClassToFeatureClass_conversion(watshed,outpath,"watshed",sqlexp)
        try:
            longflowpath1 = ArcHydroTools.LongestFlowPath(watshedind,fdr,"in_memory\longestflowpath")
        except:
            arcpy.AddMessage
            print cuindex

Any help will be appreciated.

Regards

Re: Error Trapping: ArcHydro LongestFlowPath

ChristineDartiguenave — Wed, 12 Jun 2013 14:29:50 GMT

We have modified the function so that it now runs through all selected input features and report the issues at the end (10.1.0.160). Give it a try.

Christine

Christine Dartiguenave
Esri Water Resources Team

Re: Error Trapping: ArcHydro LongestFlowPath

PeterWilson — Wed, 12 Jun 2013 15:19:58 GMT

Thanks Christine

Appreciate the following, I'll rerun the following section and let you know.

Regards

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Error Trapping: ArcHydro LongestFlowPath

Re: Error Trapping: ArcHydro LongestFlowPath

Re: Error Trapping: ArcHydro LongestFlowPath