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I have a series of elevation points from transect surveys completed on a river. I would like to interpolate this data to reveal the bathymetry of the river. The survey points are shown below: river survey points

I have tried the default options on topo to raster (cell size 109) and then used extract by mask to focus just on the river channel. It formed this raster below. The transect locations stand out clearly however I am hoping for a more continual surface. [topo to raster output[2]

I then tried IDW with a barrier polyline and this reduced the cell size down to 3. However there appears to be "seams" at the mid points between the transects. IDW

Can anyone recommend a method to interpolate these points into a smoother surface?

PollyGone
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  • What GIS software are you using? – PolyGeo Dec 09 '19 at 04:32
  • Topo to raster is an ArcGIS tool. Do you have access to the 3d analyst toolbox? If so, create a TIN from your points. See here: http://desktop.arcgis.com/en/arcmap/10.3/manage-data/tin/fundamentals-of-tin-surfaces.htm, and here: http://desktop.arcgis.com/en/arcmap/10.3/manage-data/tin/fundamentals-of-creating-tins.htm – GBG Dec 09 '19 at 21:55

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