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How to interpolate values along a stream network

BenjamenWetherill

In ArcMap, is there a way to interpolate water quality values along a stream network? I have values that were collected at stations in my stream network, and I would like to interpolate them between stations on connected streams. I thought about using raster interpolation, but I don't want to interpolation to jump laterally across watersheds - just along the flow of water. I would like to be able to use graduated coloring on the streams to show changes in water quality.

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SteveLynch

Have you looked at Spline With Barriers and Kernel Interpolation With Barriers

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SteveLynch

Have you looked at Spline With Barriers and Kernel Interpolation With Barriers

Hornbydd

Does that make sense? If you are sampling pollutants as a measure of quality won't they have "diffused" or "gone downstream" by the next day? Interpolating specific pollutants would imply some sort of static distribution I guess?

BenjamenWetherill

Yes, I would say it makes sense. Rivers are not monolithic. They receive pollutants at specific points and the pollutants get diluted or attenuated at other points.

BenjamenWetherill

Thanks. I will try these.

BenjamenWetherill

Spline with Barriers works perfectly! If I draw a polygon barrier that follows the streams and separates lateral streams, and doesn't block direct lines between consecutive sampling points. My license doesn't include Kernel with Barriers.

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