topic Re: Simplify polygon producing odd results in ArcGIS Pro Questions https://community.esri.com/t5/arcgis-pro-questions/simplify-polygon-producing-odd-results/m-p/1104224#M46275 <P><a href="https://community.esri.com/t5/user/viewprofilepage/user-id/435503">@GlenShennan</a>&nbsp;this is the simplify tool from the cartography toolset yes? Have you tried running multipart to singlepart first, just to check there aren't any multipart polygons? Then maybe check geometry and repair geometry in case there are some odd overlapping vertex strings.</P> Sun, 03 Oct 2021 05:41:54 GMT David_Brooks 2021-10-03T05:41:54Z Simplify polygon producing odd results https://community.esri.com/t5/arcgis-pro-questions/simplify-polygon-producing-odd-results/m-p/1104223#M46274 <P>Hi,</P><P>I'm trying to simply some polygons using ArcPro 2.83 on Windows 10. After using the tool some of the polygons now have line joining them. In the attribute table the geometries are all "polygon", which I believe means they're separate polygons.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="GlenShennan_0-1633233720156.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/24420iD7E057062CD16750/image-size/medium?v=v2&amp;px=400" role="button" title="GlenShennan_0-1633233720156.png" alt="GlenShennan_0-1633233720156.png" /></span></P><P>In the picture you can see the lines across Tasmania and the one connecting to the mainland. These are very much not there in the original.</P><P>&nbsp;</P><P>Any idea what's going on? What I really want it to significantly simplify the polygons without losing connectivity (the mainland is composed of several polygons touching each other) while also removing the smaller islands. The latter I can achieve using the Minimum Area option of the Simplify Polygon tool, and that seems to work fine.</P> Sun, 03 Oct 2021 04:05:00 GMT https://community.esri.com/t5/arcgis-pro-questions/simplify-polygon-producing-odd-results/m-p/1104223#M46274 GlenShennan 2021-10-03T04:05:00Z Re: Simplify polygon producing odd results https://community.esri.com/t5/arcgis-pro-questions/simplify-polygon-producing-odd-results/m-p/1104224#M46275 <P><a href="https://community.esri.com/t5/user/viewprofilepage/user-id/435503">@GlenShennan</a>&nbsp;this is the simplify tool from the cartography toolset yes? Have you tried running multipart to singlepart first, just to check there aren't any multipart polygons? Then maybe check geometry and repair geometry in case there are some odd overlapping vertex strings.</P> Sun, 03 Oct 2021 05:41:54 GMT https://community.esri.com/t5/arcgis-pro-questions/simplify-polygon-producing-odd-results/m-p/1104224#M46275 David_Brooks 2021-10-03T05:41:54Z Re: Simplify polygon producing odd results https://community.esri.com/t5/arcgis-pro-questions/simplify-polygon-producing-odd-results/m-p/1104225#M46276 <P>hmm. Well, the Multipart to Singlepart tool fails on exactly the geometry I'm having trouble with, so it sounds like you're on to something. I'll keep trying. Thanks!</P> Sun, 03 Oct 2021 05:51:35 GMT https://community.esri.com/t5/arcgis-pro-questions/simplify-polygon-producing-odd-results/m-p/1104225#M46276 GlenShennan 2021-10-03T05:51:35Z Re: Simplify polygon producing odd results https://community.esri.com/t5/arcgis-pro-questions/simplify-polygon-producing-odd-results/m-p/1104226#M46277 <P><a href="https://community.esri.com/t5/user/viewprofilepage/user-id/435503">@GlenShennan</a>&nbsp; sounds like a dodgy geometry there for sure. Run the repair geometry tool to see what's going on.</P> Sun, 03 Oct 2021 06:24:06 GMT https://community.esri.com/t5/arcgis-pro-questions/simplify-polygon-producing-odd-results/m-p/1104226#M46277 David_Brooks 2021-10-03T06:24:06Z Re: Simplify polygon producing odd results https://community.esri.com/t5/arcgis-pro-questions/simplify-polygon-producing-odd-results/m-p/1104231#M46279 <P>What was the error message?</P> Sun, 03 Oct 2021 09:12:52 GMT https://community.esri.com/t5/arcgis-pro-questions/simplify-polygon-producing-odd-results/m-p/1104231#M46279 DanPatterson 2021-10-03T09:12:52Z Re: Simplify polygon producing odd results https://community.esri.com/t5/arcgis-pro-questions/simplify-polygon-producing-odd-results/m-p/1104283#M46293 <P>I ran Repair Geometry the feature where I was having the problem had "self intersections". Simplify works properly after that. Thanks!</P> Mon, 04 Oct 2021 01:24:43 GMT https://community.esri.com/t5/arcgis-pro-questions/simplify-polygon-producing-odd-results/m-p/1104283#M46293 GlenShennan 2021-10-04T01:24:43Z