topic Re: Error in ArcHydro WIM tools 'metersPerUnit does not exist' in Water Resources Questions

Error in ArcHydro WIM tools 'metersPerUnit does not exist'

AshleyCofrin — Thu, 21 Aug 2025 16:20:53 GMT

I am working through the Wetland Identification toolset in ArcHydro and am getting this error on a few tools (screenshot below). I am using .tif's only and have tried a few different versions of the input. My project area is pretty small. I would appreciate any insight into how to resolve this.

Thanks!

Re: Error in ArcHydro WIM tools 'metersPerUnit does not exist'

CodyPatterson — Thu, 21 Aug 2025 17:45:56 GMT

Hey @AshleyCofrin

Could you send a screenshot of what the tool itself looks like before you run it, with all the parameters present?

Cody

Re: Error in ArcHydro WIM tools 'metersPerUnit does not exist'

AshleyCofrin — Thu, 21 Aug 2025 21:51:16 GMT

Yes!

Re: Error in ArcHydro WIM tools 'metersPerUnit does not exist'

AshleyCofrin — Mon, 25 Aug 2025 15:40:32 GMT

@CodyPatterson

Re: Error in ArcHydro WIM tools 'metersPerUnit does not exist'

CodyPatterson — Mon, 25 Aug 2025 16:48:38 GMT

Hey @AshleyCofrin

I apologize I had not seen this until now, from what I'm finding, there could be an inconsistency between the map coordinate system and the tif coordinate system, are they consistent? I mention this because of a post like this here:

https://gis.stackexchange.com/questions/159780/how-do-i-figure-out-the-length-of-polyline-features-in-a-feature-class-with-a-wg

They had the same issue and a spatial reference change had fixed it. Also, is it possible to get a newer or older version of this toolset, you may try a different version to check if it is an issue with the most current.

Cody

Re: Error in ArcHydro WIM tools 'metersPerUnit does not exist'

Jordyn_Miller — Wed, 10 Sep 2025 15:00:55 GMT

Hi @AshleyCofrin, were you able to resolve this error? My suggestion is to make sure you're working in a projected coordinate system. We recommend resampling the DEM to 3m as well. Please let us know if you have any additional questions!