topic MEAN ANNUAL PRECIPITATION MAP in ArcGIS Spatial Analyst Questions https://community.esri.com/t5/arcgis-spatial-analyst-questions/mean-annual-precipitation-map/m-p/558731#M8086 <HTML><HEAD></HEAD><BODY><SPAN>I'm trying to recreate the following Mean Precipitation Map on Spatial Analyst:</SPAN><BR /><A href="http://http://www.srh.noaa.gov/images/sju/climo/monthly_reports/ncdc_precip_normalsxm_PR_USVI_new.jpg">http://www.srh.noaa.gov/images/sju/climo/monthly_reports/ncdc_precip_normalsxm_PR_USVI_new.jpg<BR /></A><BR /><SPAN>I have the point feature class with the precipitation values and the limit polyline.</SPAN><BR /><SPAN>What else do I need to do an Interpolation using the IDW method? Do I have to convert the points to polygons?</SPAN><BR /><SPAN>What values do you recommend to get a similar result?</SPAN><BR /><SPAN>Thanks a lot !!!!!!</SPAN></BODY></HTML> Tue, 19 Jun 2012 14:09:20 GMT MIGUELLOPEZ 2012-06-19T14:09:20Z MEAN ANNUAL PRECIPITATION MAP https://community.esri.com/t5/arcgis-spatial-analyst-questions/mean-annual-precipitation-map/m-p/558731#M8086 <HTML><HEAD></HEAD><BODY><SPAN>I'm trying to recreate the following Mean Precipitation Map on Spatial Analyst:</SPAN><BR /><A href="http://http://www.srh.noaa.gov/images/sju/climo/monthly_reports/ncdc_precip_normalsxm_PR_USVI_new.jpg">http://www.srh.noaa.gov/images/sju/climo/monthly_reports/ncdc_precip_normalsxm_PR_USVI_new.jpg<BR /></A><BR /><SPAN>I have the point feature class with the precipitation values and the limit polyline.</SPAN><BR /><SPAN>What else do I need to do an Interpolation using the IDW method? Do I have to convert the points to polygons?</SPAN><BR /><SPAN>What values do you recommend to get a similar result?</SPAN><BR /><SPAN>Thanks a lot !!!!!!</SPAN></BODY></HTML> Tue, 19 Jun 2012 14:09:20 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/mean-annual-precipitation-map/m-p/558731#M8086 MIGUELLOPEZ 2012-06-19T14:09:20Z Re: MEAN ANNUAL PRECIPITATION MAP https://community.esri.com/t5/arcgis-spatial-analyst-questions/mean-annual-precipitation-map/m-p/558732#M8087 <HTML><HEAD></HEAD><BODY><SPAN>IDW interpolation method uses </SPAN><STRONG>points</STRONG><SPAN> as input.</SPAN><BR /><BR /><SPAN>In interpolation there's no one, best set of parameters.</SPAN><BR /><SPAN>You have to experiment what settings produce best results.</SPAN><BR /><SPAN>In your case try default settings first, then try changing Number of points in Search Radius Settings section.</SPAN><BR /><SPAN>Finally you can try change a Power parameter.</SPAN></BODY></HTML> Wed, 20 Jun 2012 05:22:43 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/mean-annual-precipitation-map/m-p/558732#M8087 MarcinGasior 2012-06-20T05:22:43Z