The true error in this particular DEM is approximately 0.5
feet. This is quite small and the overall accuracy of this DEM can
be qualified as very good. The results suggest most of the stream
channels are quite well defined with little uncertainty over their
location. The greatest uncertainty can be found in the channel
heads (i.e. where 1st order streams start). There are also a few
areas of very low relief where uncertainty is quite substantial.