We obtained the 1:24,000 USGS streams coverages whereever
they were available. They were not available for the entire
study area.
Areas for which the 1:24,000 streams were available are
shown in the figure to the right.
There are 3,439.7 km of streams shown in the figure.
Stream density can be calculated using the USGS streams
layer, for those areas that have coverage. Stream density
for this subset of the study area was 0.02 km of stream
per ha or 3.11 mi of stream per square mile.
Compare this to the other sources of stream data:
1:100k,
USFS Densified Streams and DEM-Derived streams.
This layer is provided for comparison.
We also used this information to check our DEM-derived stream
thresholds.
Data scale is very important when calculating
some statistics such as stream density. This layer does
have data that are of a uniform scale.
Please address questions or comments
to:
Dr. Ralph Garono
Principal Investigator
Earth Design Consultants, Inc.
rgarono@earthdesign.com
Laura Brophy
Principal Investigator
Green Point Consulting
brophyl@peak.org |
homepage 
