topic Re: Raster to Polygon tool fails to convert a raster in ArcMap Questions

Raster to Polygon tool fails to convert a raster

Thiago_Nascimento — Tue, 09 Mar 2021 17:58:16 GMT

The tool generates only the raster's boundary when it uses as input a raster that was automatically (after user confirmation) added to the TOC resulting from the Export Raster Data.

Steps to reproduce the failure:

Open the ArcMap (tested on version 10.8.0.12790);
Add an elevation raster to the TOC. For example, the 'EGM2008_subset.tif', available at https://www.arcgis.com/home/item.html?id=042f87ce25e34bffa244cf306dcb7aae;
Classify the raster's symbology in 3 classes;
From the layer's context menu, choose [Data > Export Data];
Check the option 'Use renderer' and proceed;
When prompted 'Would you like to add the exported data to the map as a layer?', choose 'Yes';
Open the Toolbox and use the tool [Convertion Tools/From Raster/Raster to Polygon];
Set the previously converted raster as the input raster and proceed;
The resulting Shapefile output comprises only the boundary of the raster

Workarounds:

1. After exporting the raster, when prompted to add the exported data to the map (step 6), choose 'No' and then add the raster manualy after this.
2. Proceed with the conversion
1. After exporting the raster, when prompted to add the exported data to the map, choose 'Yes'.
2. remove the raster's layer from the TOC, then undo this action, so that the layer is added again.
3. Proceed with conversion

Re: Raster to Polygon tool fails to convert a raster

DrVSSKiran — Tue, 09 Mar 2021 18:43:19 GMT

Hi,

First convert yout raster to Int and tha use tbe Int raster as a input raster of Raster to polygon tool.

Hope this works.

Thanks

Re: Raster to Polygon tool fails to convert a raster

Thiago_Nascimento — Tue, 09 Mar 2021 19:06:53 GMT

Hi @DrVSSKiran,

This is not really a question, just a bug report and a workaround, but thanks for your reply.
Maybe I should post it somewhere else, just don't know where.

Re: Raster to Polygon tool fails to convert a raster

DrVSSKiran — Tue, 09 Mar 2021 19:18:37 GMT

If it's bug drop a mail to servicedesk@esri.com. But I didn't found any bug
on ArcGIS10.8 when I was converted raster to polygon.

Re: Raster to Polygon tool fails to convert a raster

Thiago_Nascimento — Tue, 09 Mar 2021 19:35:17 GMT

Thanks. I was hoping to post it publicly to let others know about the issue and related solution.
Have you reproduced all the steps as described? The bug should occur when using Raster to Polygon after having used Export Data on the same session. It is a very specific case and easy to circumvent, but very annoying. It seems that ArcMap fails to properly load the raster (resulting from the previous operation), so the next operation works as if it received a blank raster.