topic Arcpy solution for selecting polygons of certain size and merging with larges surrounding polygon in Python Questions https://community.esri.com/t5/python-questions/arcpy-solution-for-selecting-polygons-of-certain/m-p/588151#M46098 <HTML><HEAD></HEAD><BODY><P>Hello, I am working on a school project where I have taken a 10m DEM, derived aspect, reclassified, and converted to polygons (9 classes in a Gridcode field). I now need to select areas less than 1.0 acre in size (i can currently do this using python), and then merge these selected polygons with either the polygon surrounding or adjacent to. This is the step i am struggling with a script for. any direction wouold be greatly appreciated. Basically i need to remove polygons less than one acre and merge them in with the larger surrounding polygon. #arcpy #python</P><P><IMG alt="" class="image-1 jive-image j-img-original" src="https://community.esri.com/legacyfs/online/329579_Capture.JPG" style="width: 620px; height: 330px;" /></P></BODY></HTML> Sat, 25 Feb 2017 01:11:49 GMT MikeEichorn 2017-02-25T01:11:49Z Arcpy solution for selecting polygons of certain size and merging with larges surrounding polygon https://community.esri.com/t5/python-questions/arcpy-solution-for-selecting-polygons-of-certain/m-p/588151#M46098 <HTML><HEAD></HEAD><BODY><P>Hello, I am working on a school project where I have taken a 10m DEM, derived aspect, reclassified, and converted to polygons (9 classes in a Gridcode field). I now need to select areas less than 1.0 acre in size (i can currently do this using python), and then merge these selected polygons with either the polygon surrounding or adjacent to. This is the step i am struggling with a script for. any direction wouold be greatly appreciated. Basically i need to remove polygons less than one acre and merge them in with the larger surrounding polygon. #arcpy #python</P><P><IMG alt="" class="image-1 jive-image j-img-original" src="https://community.esri.com/legacyfs/online/329579_Capture.JPG" style="width: 620px; height: 330px;" /></P></BODY></HTML> Sat, 25 Feb 2017 01:11:49 GMT https://community.esri.com/t5/python-questions/arcpy-solution-for-selecting-polygons-of-certain/m-p/588151#M46098 MikeEichorn 2017-02-25T01:11:49Z Re: Arcpy solution for selecting polygons of certain size and merging with larges surrounding polygon https://community.esri.com/t5/python-questions/arcpy-solution-for-selecting-polygons-of-certain/m-p/588152#M46099 <HTML><HEAD></HEAD><BODY><P>The name might not be intuitive, but what you want is the <A href="http://desktop.arcgis.com/en/arcmap/latest/tools/coverage-toolbox/eliminate.htm">Eliminate</A> tool.&nbsp; You can merge with neighboring polygons based on area or length of shared border.&nbsp; The Eliminate tool does require an advanced license, though.</P></BODY></HTML> Sat, 25 Feb 2017 02:56:48 GMT https://community.esri.com/t5/python-questions/arcpy-solution-for-selecting-polygons-of-certain/m-p/588152#M46099 JoshuaBixby 2017-02-25T02:56:48Z Re: Arcpy solution for selecting polygons of certain size and merging with larges surrounding polygon https://community.esri.com/t5/python-questions/arcpy-solution-for-selecting-polygons-of-certain/m-p/588153#M46100 <HTML><HEAD></HEAD><BODY><P>Thanks Joshua, i will give it a go.</P></BODY></HTML> Sat, 25 Feb 2017 02:59:01 GMT https://community.esri.com/t5/python-questions/arcpy-solution-for-selecting-polygons-of-certain/m-p/588153#M46100 MikeEichorn 2017-02-25T02:59:01Z Re: Arcpy solution for selecting polygons of certain size and merging with larges surrounding polygon https://community.esri.com/t5/python-questions/arcpy-solution-for-selecting-polygons-of-certain/m-p/588154#M46101 <HTML><HEAD></HEAD><BODY><P>And while it was still in raster form you could have done some cleaning with the SA/Generalisation toolbox.</P><P><A class="link-titled" href="http://desktop.arcgis.com/en/arcmap/latest/tools/spatial-analyst-toolbox/an-overview-of-the-generalization-tools.htm" title="http://desktop.arcgis.com/en/arcmap/latest/tools/spatial-analyst-toolbox/an-overview-of-the-generalization-tools.htm">An overview of the Generalization toolset—Help | ArcGIS Desktop</A>&nbsp;</P></BODY></HTML> Sat, 25 Feb 2017 10:05:03 GMT https://community.esri.com/t5/python-questions/arcpy-solution-for-selecting-polygons-of-certain/m-p/588154#M46101 NeilAyres 2017-02-25T10:05:03Z Re: Arcpy solution for selecting polygons of certain size and merging with larges surrounding polygon https://community.esri.com/t5/python-questions/arcpy-solution-for-selecting-polygons-of-certain/m-p/588155#M46102 <HTML><HEAD></HEAD><BODY><P>As Neil points out, this process can be accomplished using Regiongroup, a query to select all zones that are less than your threshold size, set those to null, then use Nibble to fill in the void using values from the surrounding zones in a more-or-less equal fashion&nbsp; The specific link within Neil's link is <A href="http://desktop.arcgis.com/en/arcmap/latest/tools/spatial-analyst-toolbox/generalizing-zones-with-nibble-shrink-and-expand.htm">here (... generalizing-zones-with-nibble ...)</A></P></BODY></HTML> Wed, 08 Mar 2017 03:14:46 GMT https://community.esri.com/t5/python-questions/arcpy-solution-for-selecting-polygons-of-certain/m-p/588155#M46102 DanPatterson_Retired 2017-03-08T03:14:46Z