[Jerry Davis]

Ok, this looks pretty straightforward. The cross section format of ST, X, Y, Z presumably goes from left to right, and so for our field survey data, I just need to convert cross section distances to X, Y from the starting point X, Y and orientation (in turn derived from the end point X, Y, in relation to the starting point).

Jerry

[Jerry Davis]

What I am doing is doing surveys of cross sections in the field. They are not derived from elevation models, but from using a telescopic or digital level. So I was wanting to import these in a CSV or excel format into HEC-RAS. The documentation for HEC-RAS only discusses creating these from an elevation model like a TIN or LiDAR. I have XYZ locations for the cross section start point, end points, and thalweg (similar to stream center line).

[Jerry Davis]

Thanks for providing this sample data. These seem to be cross sections at various locations along the reach. I’m assuming the rs is the longitudinal distance along the reach, and the station distances start at one side or another. However what defines where the zero station is located, or the thalweg position, or the orientation of the cross section? There must be other information that relates the cross section to XY coordinates.

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