topic Re: How to calculate percent of polygons covered by a buffer in Geoprocessing Questions https://community.esri.com/t5/geoprocessing-questions/how-to-calculate-percent-of-polygons-covered-by-a/m-p/360909#M12470 <HTML><HEAD></HEAD><BODY><P>I'm glad it worked for you. Please don't forget to mark the post that answered your question as the "Correct Answer".&nbsp;</P></BODY></HTML> Fri, 28 Apr 2017 17:08:23 GMT XanderBakker 2017-04-28T17:08:23Z How to calculate percent of polygons covered by a buffer https://community.esri.com/t5/geoprocessing-questions/how-to-calculate-percent-of-polygons-covered-by-a/m-p/360906#M12467 <HTML><HEAD></HEAD><BODY><P>Hi all,</P><P></P><P>I have thousands of points across Canada, as well as thousands of polygons. Each polygon represents a population (approximately 550 people). The points are across&nbsp;a rail network. What I need to do is find out the population within a half mile radius of each of these points.</P><P></P><P>For each Polygon I know the population density, and I've created a 0.5 mile buffer around each of the points,&nbsp;but&nbsp;I can't&nbsp;calculate the number of people in each 0.5 mile radius because many of the buffers contain many polygons, each with a different population density and with different amount of coverage of each polygon.</P><P></P><P>Any help would be very appreciated!</P><P></P><P>Please see&nbsp;attached file for reference</P><P></P><P>-Zach</P></BODY></HTML> Thu, 27 Apr 2017 20:26:41 GMT https://community.esri.com/t5/geoprocessing-questions/how-to-calculate-percent-of-polygons-covered-by-a/m-p/360906#M12467 ZachSchenk 2017-04-27T20:26:41Z Re: How to calculate percent of polygons covered by a buffer https://community.esri.com/t5/geoprocessing-questions/how-to-calculate-percent-of-polygons-covered-by-a/m-p/360907#M12468 <HTML><HEAD></HEAD><BODY><P>A question first: I noticed in the attached image that the two buffer polygons just left from the selected buffer overlap.&nbsp;Will you be handling the overlap in some way?</P><P></P><P>What I would do (ignoring the overlap between the buffer polygons to keep it simple), is first add a field with the&nbsp;population density to the polygon featureclass. Next, I would intersect the buffers with the polygons. The resulting intersect area and "joined" population density can be used to calculate the population for each intersecting area. Based on a unique id of the&nbsp;buffer polygons you can dissolve the featureclass to create the buffer polygons and sum the population within each buffer polygon (use the statistics option in the dissolve tool).</P></BODY></HTML> Thu, 27 Apr 2017 20:53:13 GMT https://community.esri.com/t5/geoprocessing-questions/how-to-calculate-percent-of-polygons-covered-by-a/m-p/360907#M12468 XanderBakker 2017-04-27T20:53:13Z Re: How to calculate percent of polygons covered by a buffer https://community.esri.com/t5/geoprocessing-questions/how-to-calculate-percent-of-polygons-covered-by-a/m-p/360908#M12469 <HTML><HEAD></HEAD><BODY><P>YES thank you!!!</P><P></P><P>The big thing I was missing was the dissolve step, I'm new to GIS software and didn't realize exactly how it worked!</P><P></P><P>Thanks again,</P><P>Zach</P></BODY></HTML> Fri, 28 Apr 2017 13:46:02 GMT https://community.esri.com/t5/geoprocessing-questions/how-to-calculate-percent-of-polygons-covered-by-a/m-p/360908#M12469 ZachSchenk 2017-04-28T13:46:02Z Re: How to calculate percent of polygons covered by a buffer https://community.esri.com/t5/geoprocessing-questions/how-to-calculate-percent-of-polygons-covered-by-a/m-p/360909#M12470 <HTML><HEAD></HEAD><BODY><P>I'm glad it worked for you. Please don't forget to mark the post that answered your question as the "Correct Answer".&nbsp;</P></BODY></HTML> Fri, 28 Apr 2017 17:08:23 GMT https://community.esri.com/t5/geoprocessing-questions/how-to-calculate-percent-of-polygons-covered-by-a/m-p/360909#M12470 XanderBakker 2017-04-28T17:08:23Z