topic IDW with barriers in ArcGIS Spatial Analyst Questions https://community.esri.com/t5/arcgis-spatial-analyst-questions/idw-with-barriers/m-p/572451#M8300 <HTML><HEAD></HEAD><BODY><SPAN>Hello!</SPAN><BR /><SPAN>I performed an IDW with barriers. I set as input the variable search radius and I specified 5 points to be considered. After a few hours, I obtained an output raster but it has some holes (pic attached). What can I do? Some points look isolated. Can I obtain continuous rasters (within the specified barriers)? I have ArcGIS 10 and I use Spatial Analysis. Thank you</SPAN></BODY></HTML> Fri, 17 May 2013 18:53:31 GMT GiorgiaB 2013-05-17T18:53:31Z IDW with barriers https://community.esri.com/t5/arcgis-spatial-analyst-questions/idw-with-barriers/m-p/572451#M8300 <HTML><HEAD></HEAD><BODY><SPAN>Hello!</SPAN><BR /><SPAN>I performed an IDW with barriers. I set as input the variable search radius and I specified 5 points to be considered. After a few hours, I obtained an output raster but it has some holes (pic attached). What can I do? Some points look isolated. Can I obtain continuous rasters (within the specified barriers)? I have ArcGIS 10 and I use Spatial Analysis. Thank you</SPAN></BODY></HTML> Fri, 17 May 2013 18:53:31 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/idw-with-barriers/m-p/572451#M8300 GiorgiaB 2013-05-17T18:53:31Z Re: IDW with barriers https://community.esri.com/t5/arcgis-spatial-analyst-questions/idw-with-barriers/m-p/572452#M8301 <HTML><HEAD></HEAD><BODY><SPAN>given your point locations, limited number of points and your constrained barriers, I doubt it</SPAN></BODY></HTML> Fri, 17 May 2013 21:23:36 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/idw-with-barriers/m-p/572452#M8301 DanPatterson_Retired 2013-05-17T21:23:36Z Re: IDW with barriers https://community.esri.com/t5/arcgis-spatial-analyst-questions/idw-with-barriers/m-p/572453#M8302 <HTML><HEAD></HEAD><BODY><SPAN>IDW uses a "line of sight" approach when barriers are used. The output extent, by default is equal to that of the input points.</SPAN><BR /><BR /><SPAN>KernelInterpolationWithBarriers in Geostatistical Analyst, on the other hand, uses a "shortest route around" a barrier.</SPAN><BR /><BR /><SPAN>Hope that this answers your question.</SPAN><BR /><BR /><SPAN>Steve</SPAN></BODY></HTML> Fri, 17 May 2013 22:21:42 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/idw-with-barriers/m-p/572453#M8302 SteveLynch 2013-05-17T22:21:42Z Re: IDW with barriers https://community.esri.com/t5/arcgis-spatial-analyst-questions/idw-with-barriers/m-p/572454#M8303 <HTML><HEAD></HEAD><BODY><SPAN>Thank you for your replies. Ok I might improve the interpolation in borders area defining another extent (I left the default value for the extent so it has the extent of the input sample points). But still, what can I do for the area within the input sample points? I don�??t have the geostatistical analysis tool.</SPAN></BODY></HTML> Sat, 18 May 2013 05:14:35 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/idw-with-barriers/m-p/572454#M8303 GiorgiaB 2013-05-18T05:14:35Z Re: IDW with barriers https://community.esri.com/t5/arcgis-spatial-analyst-questions/idw-with-barriers/m-p/572455#M8304 <HTML><HEAD></HEAD><BODY><SPAN>Use SplineWithBarriers.</SPAN></BODY></HTML> Sat, 18 May 2013 13:06:58 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/idw-with-barriers/m-p/572455#M8304 SteveLynch 2013-05-18T13:06:58Z Re: IDW with barriers https://community.esri.com/t5/arcgis-spatial-analyst-questions/idw-with-barriers/m-p/572456#M8305 <HTML><HEAD></HEAD><BODY><BLOCKQUOTE class="jive-quote">Use SplineWithBarriers.</BLOCKQUOTE><BR /><SPAN> </SPAN><BR /><SPAN>Thank you for the tip. I tried once the spline method (without barriers) for the same dataset but I obtained a very flat surface. I don't know if in my case I can get something meaningful and different if I add barriers.</SPAN></BODY></HTML> Sun, 19 May 2013 07:25:05 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/idw-with-barriers/m-p/572456#M8305 GiorgiaB 2013-05-19T07:25:05Z