Below are three error distribution curves for FABDEM (blue), COP30 (green) and SRTM (red), where Error = elevDEM - elevLiDAR.

FABDEM's curve hugs the y-axis illustrating it ignored most forest clutter.

In comparison, COP30's curve extends far to the right, capturing varying heights of the forest canopy.

SRTM suffers from the same phenomenon as COP30, although its C-band radar allows it to reach farther into the canopy, shifting its curve closer to the y-axis.