The model result provides an indication of the uncertainty in
the stream delineation. When running regular stream delineation
without any error, the results do not come with any measure of
the confidence in the location of the streams. The error modeling
identifies areas where there is substantial uncertainty over the
exact location of the streams and where additional information
sources may be required to confirm the accuracy of the result.
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.