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How can I prepare data to generate a DTM using points and breaklines, but where every breakline has nodes at different heights. For example, a river valley, which regularly falls, or a dorsal line, where each vertex is a different height.
Thanks for the answer. Tom
From my point of view, break lines are lines with very different values on each sides (e.g. cliffs), so I would not consider a river as a break line.
I would suggest that you use a TIN interpolation, with your lines used as "structure lines" and checking the "use Z coordinates" (assuming your lines have Z values)
Note : I assume that you use the Interpolation plugin
I think that the default behavior for breaklines is that they do follow a valley bottom, or ridgeline. See this for example: https://desktop.arcgis.com/en/arcmap/latest/extensions/3d-analyst/breaklines-in-surface-modeling.htm
What you're asking is that a line can include specific height values on each vertex along the line, and I don't know of any GIS products that do this. You'd need points at each vertex, and a line as a breakline that follows these vertices, I reckon.
Consider convert those lines to points, then run the interpolation.
