topic Re: Arc Hydro ArcGIS Pro - Longest Flow Path Snap Raster Error in Water Resources Questions

Arc Hydro ArcGIS Pro - Longest Flow Path Snap Raster Error

Jimmy_Simpson — Sun, 23 Jan 2022 21:07:19 GMT

I receive the following error when running several of the longest flow path tools (for catchments, for sub-watersheds, etc.) in ArcGIS Pro.

('line 218', 'c:\\program files\\arcgis\\pro\\Resources\\ArcToolbox\\Scripts\\archydro\\longestflowpathforcatchments.py', "AttributeError: 'GPEnvironment' object has no attribute 'SnapRaster'")

Any help would be appreciated. Currently I am having to take my FCs and run longest flow path in ArcMap and then move back to Pro.

Re: Arc Hydro ArcGIS Pro - Longest Flow Path Snap Raster Error

DanPatterson — Sun, 23 Jan 2022 21:30:43 GMT

open up the script and see how they set the snap raster

arcpy.env.snapRaster

is correct, it may be a capital S vs a small s issue in the script. If it is, report it to the archydro people, I don't have it installed to check the script myself

Snap Raster (Environment setting)—ArcGIS Pro | Documentation

env—ArcGIS Pro | Documentation

Re: Arc Hydro ArcGIS Pro - Longest Flow Path Snap Raster Error

Jimmy_Simpson — Sun, 23 Jan 2022 22:00:05 GMT

Dan,

You hit the nail on the head I believe. I see 10 lines before that "snapRaster" and in line 218 "SnapRaster" - going to try making a copy of their script with that one change and see if it works.

I would report it to the ArcHydro team, but have sent them a couple emails reporting issues and have never got a response back. Since I see them replying to questions in this group, I am hoping this post does some good.

Re: Arc Hydro ArcGIS Pro - Longest Flow Path Snap Raster Error

Jimmy_Simpson — Sun, 23 Jan 2022 23:07:32 GMT

Yes - Line 218 of the Longest Flow Path for Catchments is written as "SnapRaster" instead of "snapRaster" - Making this change allowed the script to run without error.

Arc Hydro team - please make this change on all Longest Flow Path scripts as I believe most if not all of them contain this error.

@DanPatterson - Thank you for solving this so quickly - its greatly appreciated!!! I also use your Numpy tools quite frequently so thank you for all you do!!!

Re: Arc Hydro ArcGIS Pro - Longest Flow Path Snap Raster Error

ZichuanYe — Mon, 24 Jan 2022 17:55:43 GMT

Yes, it should be arcpy.env.snapRaster and not .SnapRaster. We'll fix the issue and produce a new build.

Thanks for catching this error, and @DanPatterson for your quick reply.

Re: Arc Hydro ArcGIS Pro - Longest Flow Path Snap Raster Error

ZichuanYe — Tue, 25 Jan 2022 20:15:28 GMT

A new build with arcpy.env.snapRaster correctly set is posted at this location:

https://downloads.esri.com/archydro/archydro/Setup/Pro/2.9.13/

Please let us know if you have further questions