Adding elevation data to line using ArcGIS Pro

Question

I am using ArcGIS Pro.

I want to draw a line at the starting and ending of elevation, and then use straight line interpolation to assign the rest of the line an elevation.

Answer 1

To achieve this you need 3D Analyst and also elevation model:

arcpy.InterpolateShape_3d("DEM", "ROADS", "in_memory/road_3d")
arcpy.AddGeometryAttributes_management("road_3d", "LINE_START_MID_END")
arcpy.FeatureTo3DByAttribute_3d("road_3d", "in_memory/LINEAR_3D", "START_Z", "END_Z")

So for the road shown:

it will result in:

Note: If you know elevations at line ends, you'll need just one tool, that is feature to 3d by attribute(s).

This is actually a very primitive way of 'DEM burning' used by many applications.