8000

• UCREFRP Catalog Number: 8000
• Author: Werth, L. F., et al.
• Title: Developing a Geographic Information System for Resources Monitoring on the Colorado River in the Grand Canyon.
• USFW Year: 1993.
• USFW - Doc Type: R-93-20,
• Copyright Material: NO

theodolites, and electronic distance measuring instruments were used to do traverses between
the GPS control points. This process added intermediate control points which were used to
produce the base maps. An example of the GPS and total station surveying units used may
be seen on figures 3 and 4.

4 u
Figure 3. - A GPS unit being used to establish control in the canyon.
s?? ?,r r
77:?
d a
-- _
rt
Figure 4. - A total station being used to run traverses between established GPS
points.
6