topic Re: Clean up DTM from modern features in ArcGIS Pro Questions

Clean up DTM from modern features

BenFx — Wed, 08 Mar 2023 12:24:10 GMT

Hi, in order to get a premodern DTM, I want to clean the ASTER GDEM from anthropogenic features. To do this, I have compiled the vector data of modern features and want to extract them from the DTM. The result should be a perforated DTM. However, Extract by Mask and Clip Raster (Use input features for clipping geometry) provide me the rasterised modern features and not the perforated DTM.

How can I obtain a perforated DTM with No-Data-Holes? I have not found a suitable answer elsewhere in the forum...

Many thanks in advance - Ben

Re: Clean up DTM from modern features

DanPatterson — Wed, 08 Mar 2023 13:16:53 GMT

Are you attempting to set those areas to Null?

Set Null (Spatial Analyst)—ArcGIS Pro | Documentation

since you can't recover the dtm values premodern values from an existing dtm

Re: Clean up DTM from modern features

BenFx — Wed, 08 Mar 2023 13:27:41 GMT

You might be on to someting. I'll give it a try. Thx for the fast response

Re: Clean up DTM from modern features

BenFx — Wed, 08 Mar 2023 13:50:25 GMT

I assumed that setting the modern, rasterised features to Null might help, but it didn't.

Re: Clean up DTM from modern features

BenFx — Thu, 09 Mar 2023 12:03:53 GMT

Basically, I want to perforate a raster layer with a vector layer. The vector layer features should be cut out of the raster and leave a raster with void gaps.

Re: Clean up DTM from modern features

DanPatterson — Thu, 09 Mar 2023 13:10:27 GMT

that is what SetNull does

Re: Clean up DTM from modern features

BenFx — Thu, 09 Mar 2023 13:46:17 GMT

Thank you very much for your patience, Dan 🙂 I will wrap my head around it

Re: Clean up DTM from modern features

BenFx — Tue, 14 Mar 2023 13:17:37 GMT

The reason why Set Null did not output a correct perforated raster was due to an unsuitable file format.
I rasterised the compiled vector layer by using Extract by mask. The output was reclassified and exported to TIFF. Also the DTM was exported to TIFF. Only then was a perforated raster achieved. All previous attempts with FGDBR produced incomprehensible results.

Thanks again 🙂