https://community.esri.com/t5/geoprocessing-questions/how-to-interpolate-values-along-a-stream-network/m-p/1048432#M25460 <P>Yes, I would say it makes sense.&nbsp; Rivers are not monolithic.&nbsp; They receive pollutants at specific points and the pollutants get diluted or attenuated at other points.</P> Sat, 17 Apr 2021 22:31:14 GMT BenjamenWetherill 2021-04-17T22:31:14Z https://community.esri.com/t5/geoprocessing-questions/how-to-interpolate-values-along-a-stream-network/m-p/1047684#M25456 <P>In ArcMap, is there a way to interpolate water quality values along a stream network?&nbsp; I have values that were collected at stations in my stream network, and I would like to interpolate them between stations on connected streams.&nbsp; I thought about using raster interpolation, but I don't want to interpolation to jump laterally across watersheds - just along the flow of water.&nbsp; I would like to be able to use graduated coloring on the streams to show changes in water quality.</P> Thu, 15 Apr 2021 16:57:43 GMT https://community.esri.com/t5/geoprocessing-questions/how-to-interpolate-values-along-a-stream-network/m-p/1047684#M25456 BenjamenWetherill 2021-04-15T16:57:43Z https://community.esri.com/t5/geoprocessing-questions/how-to-interpolate-values-along-a-stream-network/m-p/1047689#M25457 <P>Have you looked at <A href="https://desktop.arcgis.com/en/arcmap/10.3/tools/spatial-analyst-toolbox/spline-with-barriers.htm" target="_self">Spline With Barriers</A> and <A href="https://pro.arcgis.com/en/pro-app/latest/tool-reference/geostatistical-analyst/kernel-interpolation-with-barriers.htm" target="_self">Kernel Interpolation With Barriers</A></P> Thu, 15 Apr 2021 17:09:47 GMT https://community.esri.com/t5/geoprocessing-questions/how-to-interpolate-values-along-a-stream-network/m-p/1047689#M25457 SteveLynch 2021-04-15T17:09:47Z https://community.esri.com/t5/geoprocessing-questions/how-to-interpolate-values-along-a-stream-network/m-p/1048173#M25459 <P>Does that make sense? If you are sampling pollutants as a measure of quality won't they have "diffused" or&nbsp; "gone downstream" by the next day? Interpolating specific pollutants would imply some sort of static distribution I guess?</P> Fri, 16 Apr 2021 15:44:56 GMT https://community.esri.com/t5/geoprocessing-questions/how-to-interpolate-values-along-a-stream-network/m-p/1048173#M25459 DuncanHornby 2021-04-16T15:44:56Z https://community.esri.com/t5/geoprocessing-questions/how-to-interpolate-values-along-a-stream-network/m-p/1048432#M25460 <P>Yes, I would say it makes sense.&nbsp; Rivers are not monolithic.&nbsp; They receive pollutants at specific points and the pollutants get diluted or attenuated at other points.</P> Sat, 17 Apr 2021 22:31:14 GMT https://community.esri.com/t5/geoprocessing-questions/how-to-interpolate-values-along-a-stream-network/m-p/1048432#M25460 BenjamenWetherill 2021-04-17T22:31:14Z https://community.esri.com/t5/geoprocessing-questions/how-to-interpolate-values-along-a-stream-network/m-p/1048433#M25461 <P>Thanks.&nbsp; I will try these.</P> Sat, 17 Apr 2021 13:07:09 GMT https://community.esri.com/t5/geoprocessing-questions/how-to-interpolate-values-along-a-stream-network/m-p/1048433#M25461 BenjamenWetherill 2021-04-17T13:07:09Z https://community.esri.com/t5/geoprocessing-questions/how-to-interpolate-values-along-a-stream-network/m-p/1048445#M25462 <P>Spline with Barriers works perfectly!&nbsp; If I draw a polygon barrier that follows the streams and separates lateral streams, and doesn't block direct lines between consecutive sampling points.&nbsp; My license doesn't include Kernel with Barriers.</P> Sat, 17 Apr 2021 14:47:43 GMT https://community.esri.com/t5/geoprocessing-questions/how-to-interpolate-values-along-a-stream-network/m-p/1048445#M25462 BenjamenWetherill 2021-04-17T14:47:43Z