Reference Surface vs. Reconstructed Surface
Comparing the plots where we collected imagery after destructive
harvesting and reconstructed the ‘true’ reference ground surface using
SfM (n = 35) with our reconstructed interpolated ground surface showed a
decrease in R2 from 0.44 to 0.42 at 5 mm voxels (Fig.
5). The mean absolute difference in volumes was 20% of the volume
calculated using the reference ground surface.