[Tim Bedford]

I solved the problem. My interpolated cross sections did not follow the true topography of the channel and due to the infrequent “real” cross sections created discrepancies between RAS and GIS.

Lessons learned: When using LiDAR data take real cross sections very frequently to avoid deviations topographic deviations.

[Tim Bedford]

Chris,
How many cross sections are we talking here? Something similar I have done is change XS’s with the “interpolate line” tool which is apart of 3D analyst in ArcMap draw a line directly over my GeoRAS created XS cut line plot the profile (another tool in 3D analyst) export that data, then exchange the station-elevation data in RAS with my copied excel data.

If that makes any sense or seems appropriate I can walk you through it in a little more detailed fashion, otherwise all I can think of to help is “copy current cross section” function in the Cross Section Data.

Good luck

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