topic Trouble with Census Data in Water Utilities Questions https://community.esri.com/t5/water-utilities-questions/trouble-with-census-data/m-p/561407#M1378 <HTML><HEAD></HEAD><BODY><P>I am doing project calculating displacement due to sea level rise (SLR). I am doing so by using intersecting the SLR polygons with census tracts for each state and then running zonal statistics as table with the intersect shapefile and a Gridded Population raster. However, when I run the zonal stats as table tool, I get higher rates of displacement than is reasonable. For example, one census tract has a total population of ~8,000 but the calculated displacement for that tract is ~12,000. Is there a reason for why I am getting higher rates of displacement than I should be? Or is there a better method I should use? Thanks</P></BODY></HTML> Fri, 19 Jun 2020 17:32:05 GMT RachelSuhs 2020-06-19T17:32:05Z Trouble with Census Data https://community.esri.com/t5/water-utilities-questions/trouble-with-census-data/m-p/561407#M1378 <HTML><HEAD></HEAD><BODY><P>I am doing project calculating displacement due to sea level rise (SLR). I am doing so by using intersecting the SLR polygons with census tracts for each state and then running zonal statistics as table with the intersect shapefile and a Gridded Population raster. However, when I run the zonal stats as table tool, I get higher rates of displacement than is reasonable. For example, one census tract has a total population of ~8,000 but the calculated displacement for that tract is ~12,000. Is there a reason for why I am getting higher rates of displacement than I should be? Or is there a better method I should use? Thanks</P></BODY></HTML> Fri, 19 Jun 2020 17:32:05 GMT https://community.esri.com/t5/water-utilities-questions/trouble-with-census-data/m-p/561407#M1378 RachelSuhs 2020-06-19T17:32:05Z Re: Trouble with Census Data https://community.esri.com/t5/water-utilities-questions/trouble-with-census-data/m-p/561408#M1379 <HTML><HEAD></HEAD><BODY><P><EM style="background-color: #ffffff; ">Gridded Population raster...</EM></P><P></P><P><SPAN style="background-color: #ffffff;">I would double check your population data;&nbsp; For the tract that is giving you the problem, how is the 8,000 population derived?&nbsp; The only population&nbsp; data I've ever worked with is in polygon form, so the assumption&nbsp; that the population is smoothly distributed across the polygon has to be made.&nbsp; Does your <EM>gridded population&nbsp; raster</EM>&nbsp; have cell to cell values that would indicate density variability?</SPAN></P></BODY></HTML> Fri, 19 Jun 2020 18:23:21 GMT https://community.esri.com/t5/water-utilities-questions/trouble-with-census-data/m-p/561408#M1379 JoeBorgione 2020-06-19T18:23:21Z Re: Trouble with Census Data https://community.esri.com/t5/water-utilities-questions/trouble-with-census-data/m-p/561409#M1380 <HTML><HEAD></HEAD><BODY><P>The 8,000 population is derived from current census data estimates and is in polygon form. The gridded population raster does have density variability if I am understanding your question right. The gridded population raster can be found here&nbsp;<A class="link-titled" href="https://sedac.ciesin.columbia.edu/data/collection/gpw-v4/sets/browse" title="https://sedac.ciesin.columbia.edu/data/collection/gpw-v4/sets/browse">Data ยป Gridded Population of the World (GPW), v4 | SEDAC</A>&nbsp;</P></BODY></HTML> Fri, 19 Jun 2020 18:34:13 GMT https://community.esri.com/t5/water-utilities-questions/trouble-with-census-data/m-p/561409#M1380 RachelSuhs 2020-06-19T18:34:13Z Re: Trouble with Census Data https://community.esri.com/t5/water-utilities-questions/trouble-with-census-data/m-p/561410#M1381 <HTML><HEAD></HEAD><BODY><P>The polygon data shows 8,000; can you sum all your grid cells and see what that shows?</P></BODY></HTML> Fri, 19 Jun 2020 18:56:32 GMT https://community.esri.com/t5/water-utilities-questions/trouble-with-census-data/m-p/561410#M1381 JoeBorgione 2020-06-19T18:56:32Z