topic Determining the Difference in Area between Inner and Outer Polygons? in Geoprocessing Questions https://community.esri.com/t5/geoprocessing-questions/determining-the-difference-in-area-between-inner/m-p/269734#M9312 <HTML><HEAD></HEAD><BODY><SPAN>Ok. I just started having to use ArcGIS again after a year and a half of absence, so I'm pretty rusty and can't remember how to do this...</SPAN><BR /><BR /><SPAN>I need to be able to determine the area of a polygon around another polygon excluding the inner polygons area. If that makes sense.</SPAN><BR /><BR /><SPAN>ATM when I place a polygon on the map and another "inside" it, it is more like placing it on top and still calculating the original area, where as I need it to exclude the new polygon's area automatically</SPAN><BR /><BR /><SPAN>attached is a crude representation of what I'm after. I need the final A1-A2=A3</SPAN><BR /><BR /><SPAN>Any help would be appreciated, I know there is a simple solution but I can't seem to track it down</SPAN></BODY></HTML> Mon, 14 Mar 2011 14:20:41 GMT ClaytonAnderson 2011-03-14T14:20:41Z Determining the Difference in Area between Inner and Outer Polygons? https://community.esri.com/t5/geoprocessing-questions/determining-the-difference-in-area-between-inner/m-p/269734#M9312 <HTML><HEAD></HEAD><BODY><SPAN>Ok. I just started having to use ArcGIS again after a year and a half of absence, so I'm pretty rusty and can't remember how to do this...</SPAN><BR /><BR /><SPAN>I need to be able to determine the area of a polygon around another polygon excluding the inner polygons area. If that makes sense.</SPAN><BR /><BR /><SPAN>ATM when I place a polygon on the map and another "inside" it, it is more like placing it on top and still calculating the original area, where as I need it to exclude the new polygon's area automatically</SPAN><BR /><BR /><SPAN>attached is a crude representation of what I'm after. I need the final A1-A2=A3</SPAN><BR /><BR /><SPAN>Any help would be appreciated, I know there is a simple solution but I can't seem to track it down</SPAN></BODY></HTML> Mon, 14 Mar 2011 14:20:41 GMT https://community.esri.com/t5/geoprocessing-questions/determining-the-difference-in-area-between-inner/m-p/269734#M9312 ClaytonAnderson 2011-03-14T14:20:41Z Re: Determining the Difference in Area between Inner and Outer Polygons? https://community.esri.com/t5/geoprocessing-questions/determining-the-difference-in-area-between-inner/m-p/269735#M9313 <HTML><HEAD></HEAD><BODY><SPAN>Using Graphics: </SPAN><A href="http://blogs.esri.com/Dev/blogs/geodatabase/archive/2009/08/07/Clipping-Rasters-_2D00_-Part-C-_2D00_-Reverse_2D00_Clipping-on-a-raster-_2800_aka-Masking_2900_.aspx">Reverse-clipping</A><BR /><BR /><SPAN>Editing Session: </SPAN><A href="http://forums.arcgis.com/threads/21440-Polygons-subtraction?p=69768">Polygons subtraction</A><BR /><BR /><SPAN>Once the clip is completed, the area field will need to be re-calculated in shapefiles (not for feature classes - stored in a gdb). This is done with the Calculate Geometry feature in the attribute table.</SPAN></BODY></HTML> Mon, 14 Mar 2011 16:48:38 GMT https://community.esri.com/t5/geoprocessing-questions/determining-the-difference-in-area-between-inner/m-p/269735#M9313 DonovanCameron 2011-03-14T16:48:38Z