topic Predicting values for polygons in ArcGIS GeoStatistical Analyst Questions https://community.esri.com/t5/arcgis-geostatistical-analyst-questions/predicting-values-for-polygons/m-p/262297#M610 <HTML><HEAD></HEAD><BODY><SPAN>Hello all,</SPAN><BR /><BR /><SPAN>Hope somebody can help me. </SPAN><BR /><SPAN>I performed the interpolation (kriging) and got a geostatistical layer. Then I am using this method </SPAN><BR /><SPAN>Predicting values for specified locations </SPAN><A href="http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=Predicting_values_for_specified_locations">http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=Predicting_values_for_specified_locations</A><BR /><SPAN>When I set polygons as my specific locations I have the output with predicted values for each polygon in the attribute table. But when I </SPAN><BR /><SPAN>select point locations at centers of the polygons, the predicted values are different.</SPAN><BR /><SPAN>My question is: how ArcGIS predicts values for polygons? Any literature about this?</SPAN><BR /><SPAN>Before I found this way, I was going to produce a grid with very small cells and then calculate average values of cells falling inside each polygon, but it is very time and memory consuming. But for using Predicting for locations I need to know exactly what is the method behind.</SPAN><BR /><BR /><SPAN>I appreciate your answers!</SPAN><BR /><SPAN>Nadya</SPAN></BODY></HTML> Thu, 06 Sep 2012 19:19:57 GMT NadyaBasos 2012-09-06T19:19:57Z Predicting values for polygons https://community.esri.com/t5/arcgis-geostatistical-analyst-questions/predicting-values-for-polygons/m-p/262297#M610 <HTML><HEAD></HEAD><BODY><SPAN>Hello all,</SPAN><BR /><BR /><SPAN>Hope somebody can help me. </SPAN><BR /><SPAN>I performed the interpolation (kriging) and got a geostatistical layer. Then I am using this method </SPAN><BR /><SPAN>Predicting values for specified locations </SPAN><A href="http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=Predicting_values_for_specified_locations">http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=Predicting_values_for_specified_locations</A><BR /><SPAN>When I set polygons as my specific locations I have the output with predicted values for each polygon in the attribute table. But when I </SPAN><BR /><SPAN>select point locations at centers of the polygons, the predicted values are different.</SPAN><BR /><SPAN>My question is: how ArcGIS predicts values for polygons? Any literature about this?</SPAN><BR /><SPAN>Before I found this way, I was going to produce a grid with very small cells and then calculate average values of cells falling inside each polygon, but it is very time and memory consuming. But for using Predicting for locations I need to know exactly what is the method behind.</SPAN><BR /><BR /><SPAN>I appreciate your answers!</SPAN><BR /><SPAN>Nadya</SPAN></BODY></HTML> Thu, 06 Sep 2012 19:19:57 GMT https://community.esri.com/t5/arcgis-geostatistical-analyst-questions/predicting-values-for-polygons/m-p/262297#M610 NadyaBasos 2012-09-06T19:19:57Z Re: Predicting values for polygons https://community.esri.com/t5/arcgis-geostatistical-analyst-questions/predicting-values-for-polygons/m-p/262298#M611 <HTML><HEAD></HEAD><BODY><SPAN>With the exception of areal interpolation in ArcGIS 10.1, geostatistical layers can only predict to points.&nbsp; If you supply a polygon feature class to predict to, it will predict the value at the polygon centroid.</SPAN><BR /><BR /><SPAN>To predict the value in a polygon, convert the geostatistical layer to raster (via </SPAN><A href="http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=GA_Layer_to_Grid_%28Geostatistical_Analyst%29">GA Layer to Grid</A><SPAN> gp tool), then use </SPAN><A href="http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?topicname=Zonal_Statistics_as_Table">Zonal Statistics as Table</A><SPAN>.&nbsp; You'll then need to join the table back to the polygons.</SPAN></BODY></HTML> Thu, 06 Sep 2012 20:09:17 GMT https://community.esri.com/t5/arcgis-geostatistical-analyst-questions/predicting-values-for-polygons/m-p/262298#M611 EricKrause 2012-09-06T20:09:17Z