topic Re: Why the polygon shape changed ??!! in Geoprocessing Questions https://community.esri.com/t5/geoprocessing-questions/why-the-polygon-shape-changed/m-p/92317#M3156 <HTML><HEAD></HEAD><BODY><SPAN>You are probably using a relatively coarse cluster tolerance and/or resolution. Per my experience, unless you have a REALLY good reason to, you should endevor to use the ESRI defaults:</SPAN><BR /><BR /><SPAN>arcpy.env.XYResolution = "0.0005 METERS"</SPAN><BR /><SPAN>arcpy.env.XYTolerance = "0.001 METERS"</SPAN><BR /><BR /><SPAN>Geoprocessing tools generally default to the most coarse tolerance/resolutiuon. So if you union a FC at 10ft tol with another at 1ft tol, the output will be a 10ft tol (unless you specify otherwise in the tool GUI or the tool's envr. settings).</SPAN><BR /><BR /><SPAN>Here's some reference material: </SPAN><A class="jive-link-external-small" href="http://resources.arcgis.com/en/help/main/10.1/index.html#//003n00000005000000#GUID-69FA8570-7C64-4213-B822-68716CD9E764" rel="nofollow" target="_blank">http://resources.arcgis.com/en/help/main/10.1/index.html#//003n00000005000000#GUID-69FA8570-7C64-4213-B822-68716CD9E764</A><SPAN> (scroll down a bit more than half way down the page to get to the part about tolerance and resolution).</SPAN></BODY></HTML> Mon, 10 Jun 2013 21:18:12 GMT ChrisSnyder 2013-06-10T21:18:12Z Why the polygon shape changed ??!! https://community.esri.com/t5/geoprocessing-questions/why-the-polygon-shape-changed/m-p/92316#M3155 <HTML><HEAD></HEAD><BODY><SPAN>Anyone has the same experience that the shape of polygon changed automatically with some processing. </SPAN><BR /><SPAN>For example, a perfect circle changed to n-gon shape, n can be between 3 to 7. a round ending road changed to a sharp point. </SPAN><BR /><SPAN>it happened right after i did some processing, such as split, update. The data looks ok with merge method. </SPAN><BR /><BR /><SPAN>Do you have any idea what happen on my data, and how can i get ride of this trouble. thanks. </SPAN><BR /><BR /><SPAN>[ATTACH=CONFIG]25184[/ATTACH]</SPAN></BODY></HTML> Mon, 10 Jun 2013 20:11:07 GMT https://community.esri.com/t5/geoprocessing-questions/why-the-polygon-shape-changed/m-p/92316#M3155 LeeHightower 2013-06-10T20:11:07Z Re: Why the polygon shape changed ??!! https://community.esri.com/t5/geoprocessing-questions/why-the-polygon-shape-changed/m-p/92317#M3156 <HTML><HEAD></HEAD><BODY><SPAN>You are probably using a relatively coarse cluster tolerance and/or resolution. Per my experience, unless you have a REALLY good reason to, you should endevor to use the ESRI defaults:</SPAN><BR /><BR /><SPAN>arcpy.env.XYResolution = "0.0005 METERS"</SPAN><BR /><SPAN>arcpy.env.XYTolerance = "0.001 METERS"</SPAN><BR /><BR /><SPAN>Geoprocessing tools generally default to the most coarse tolerance/resolutiuon. So if you union a FC at 10ft tol with another at 1ft tol, the output will be a 10ft tol (unless you specify otherwise in the tool GUI or the tool's envr. settings).</SPAN><BR /><BR /><SPAN>Here's some reference material: </SPAN><A class="jive-link-external-small" href="http://resources.arcgis.com/en/help/main/10.1/index.html#//003n00000005000000#GUID-69FA8570-7C64-4213-B822-68716CD9E764" rel="nofollow" target="_blank">http://resources.arcgis.com/en/help/main/10.1/index.html#//003n00000005000000#GUID-69FA8570-7C64-4213-B822-68716CD9E764</A><SPAN> (scroll down a bit more than half way down the page to get to the part about tolerance and resolution).</SPAN></BODY></HTML> Mon, 10 Jun 2013 21:18:12 GMT https://community.esri.com/t5/geoprocessing-questions/why-the-polygon-shape-changed/m-p/92317#M3156 ChrisSnyder 2013-06-10T21:18:12Z Re: Why the polygon shape changed ??!! https://community.esri.com/t5/geoprocessing-questions/why-the-polygon-shape-changed/m-p/92318#M3157 <HTML><HEAD></HEAD><BODY><SPAN>thanks. the problem is solved.</SPAN></BODY></HTML> Tue, 11 Jun 2013 13:46:30 GMT https://community.esri.com/t5/geoprocessing-questions/why-the-polygon-shape-changed/m-p/92318#M3157 LeeHightower 2013-06-11T13:46:30Z