I am eventually trying to produce a TIN model of a roadway, I produced a very accurate STM with ground control points. However the triangle elements withing the STM (as well with the point cloud) believe the bridge is a structure and not part of the roadway (see attached photos). I need the triangles to span over the bridge deck also. What type of settings should I change in the ground extraction for the triangle element mesh to span over the bridge deck also? I currently used a terrain Variation #5 setting and a max traiangle edge of 3'. Also, it is becoming very laborious to repair artifacts that are messing up my triangle mesh, any way of correcting this setting before the ground extraction?
You can manually add points to form triangles where you want to define it as the ground.
See: https://www.youtube.com/watch?v=G9FZ9VMLKho&t=929s