= Solution
Use \b[<airborne lidar> with sufficient pulse density and ground-return classification]. Laser travel times give ranges; the aircraft’s surveyed position and orientation place returns in three dimensions. Multiple returns include canopy and, where gaps permit, the ground. Classify ground points, remove vegetation returns and interpolate a bare-ground <digital elevation model> over the $20\,\mathrm{km^2}$ strip.
This specifically addresses the forest-obscured <fault scarp>, unlike ordinary optical stereo, which primarily models the visible canopy. Leaf-off acquisition can improve ground sampling where relevant. Dense understorey and a complete lack of ground returns still cause uncertainty; interpolation does not create observed ground heights. Inspect ground-point coverage and compare hillshades under several illumination directions.<What is the difference between lidar data and a digital elevation model by United States Geological Survey>[Point clouds, vegetation removal and the bare-earth product]{ref}
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