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

CONTENTS
Page
Introduction ......................................................... 1
Background ........................................................ 1
Objectives ......................................................... 2
Conclusions ......................................................... 2
Study Area .......................................................... 3
Methods ............................................................ 3
Production of the large scale base map products ............................. 4
Aerial photography. ................................................ 7
GIS data base ....................................................... 8
Data base development ................................................ 11
Verification and transfer ............................................... 15
Scanning .......................................................... 17
Editing ........................................................... 17
Discussion .......................................................... 18
Long-term monitoring ................................................ 18
Bibliography ......................................................... 27
Appendix
APPENDIXES
A Site segregation ................................................... 29
B GCES/GIS classification scheme ....................................... 33
C Class definitions .................................................. 37
D Data sets being developed by the Remote Sensing and Geographic Information
Section and the GCES/GIS directories they reside in ...................... 41
FIGURES
Figure
1 Location map (foldout at end of report) ................................. Attached
2 A schematic diagram illustrating the steps in GCES base map development ..... 5
3 A GPS unit being used to establish control in the canyon .................... 6
4 A total station being used to run traverses between established GPS points ...... 6
5 5- by 5-foot control panel used as reference point for aerial photography in the
mapping effort .................................................. 8
6 Steps involved in developing the GCES/GIS data base ...................... 9
7 Data base structure ................................................ 10
8 The three levels of accuracy within the GCES/GIS data base ................. 13
9 The 1:2,400 scale CIR photography used in the field for identifying defined
classes ........................................................ 16
10 A sample of the orthophoto grid ....................................... 16
11 Sample plot of data set generated for site No. 4 (foldout at end of report) ........ Attached
12 A 3-D perspective of the Nankoweap monitoring site No. 4 at a low flow
of 5,000 ft3/s .................................................... 21
13 A 3-D perspective of the Nankoweap monitoring site No. 4 at a high flow
of 35,000 ft3/s ................................................... 23
14 A 3-D perspective of surficial geology inundated at 35,000 ft3/s in the Nankoweap
monitoring site No.4 ............................................. 25
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