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Clean up DTM from modern features

BenFx

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

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DanPatterson

that is what SetNull does

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DanPatterson

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

BenFx

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

BenFx

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

BenFx

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.

DanPatterson

that is what SetNull does

BenFx

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

BenFx

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 🙂

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