Geometric Overpass Extraction from Vector Road Data and DSMs
Abstract: We present a method to extract elevated road structures,
typically overpassing other roads, transit lines, and watercourses. The technique uses
a digital surface model (DSM) and roughly aligned vector road data and outputs geometry
approximating the shape and elevation of the elevated road deck. Our method is robust
against noise in DSM elevations and can recover elevated roads partially obscured by
trees and other overpasses. We demonstrate our method parallelized over city-wide DSMs,
and formulate a confidence metric ranking the fidelity of the reconstruction.