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14 <br />7-2090 (4-81) <br />Bureau of Reclamation <br />TECHNICAL REPORT STANDARD TITLE PAGE <br />1. REPORT NO. 3. RECIPIENT'S CATALOG NO. <br />R-93-20 <br />4. TITLE AND SUBTITLE 5. REPORT DATE <br />D September 1993 <br />EVELOPING A GEOGRAPHIC INFORMATION FOR <br /> <br />RESOURCE MONITORING ON THE COLORADO 6. PERFORMING ORGANIZATION CODE <br />RIVER IN THE GRAND CANYON D-3744 <br />7. AUTHOR(S) 8. PERFORMING ORGANIZATION <br />Lee F. Werth, Patrick J. Wright, Michael J. Pucherelli, REPORT NO. <br />David L. Wegner, Diana N. Kimberling <br />9. PERFORMING ORGANIZATION NAME AND ADDRESS 10. WORK UNIT NO. <br /> <br />Bureau of Reclamation 11. CONTRACT OR GRANT NO. <br />Denver Office <br /> <br />Denver CO 80225 13. TYPE OF REPORT AND PERIOD COVERED <br />12. SPONSORING AGENCY NAME AND ADDRESS <br /> DIBR <br />Same <br /> 14. SPONSORING AGENCY CODE <br />15. SUPPLEMENTARY NOTES <br />Microfiche and hard copy available at the Denver Office, Denver, Colorado. Ed: TH <br />16.ABSTRACT <br />Bureau of Reclamation studies on the impacts of Glen Canyon Dam operations on downstream natural and <br />cultural resources in the Grand Canyon have shown that fluctuating flows have eroded beaches, altered <br />riparian habitats and archaeological sites, and reduced native fish populations. These known impacts have led <br />to the development of a long-term monitoring program for resources below the dam and a mapping project <br />using a GIS (Geographic Information System). <br />Long-term monitoring of the resources on the Colorado River has required the development of a digital data <br />base for mapping speciflc resources at selected sites. With a GIS, critical resources and areas of interest can be <br />examined at different flow rates to determine changes over time. Thirteen monitoring sites encompassing 63 <br />miles from Lake Powell to Lake Mead have been selected for mapping. Geographic controls for the topographic <br />maps have been established using a GPS (Global Positioning System) and conventional surveying techniques. <br />The 13 sites have also been photographed with 1:7,200 and 1:14,400 scale black and white film and 1:4,800 <br />scale CIR (color infrared) film. Using the established control network in the Canyon along with large scale, <br />aerial photography, topographic and orthophoto base map products are being developed for each monitoring <br />site. <br />A pilot study conducted on a single monitoring site during 1990 - 1991 established the methodology to be used <br />in the collection, transfer, and generation of data to produce a digital product for the remaining sites. About 25 <br />natural and cultural resource categories were transferred to the orthopboto base maps, scan digitized, and <br />entered into ARC/INFO format. Information such as river mile, trail locations, beach areas, vegetation type, <br />and cultural resources were entered in the form of point, line, and polygon data. These data can be rapidly <br />updated, displayed, and analyzed for changes through time using the GIS. <br />17. KEY WORDS AND DOCUMENT ANALYSIS <br />a. DESCRIPTORS-- cartography/aerial surveys/ mapping/ photogrammetry/ surveying/ <br />topographic mapping/Geographic Information System/ Remote Sensing( Global Positioning <br />System <br />b. IDENTIFIERS- Grand Canyon/ Glen Canyon Dam/ Colorado River/ <br />C. COSAT/ Fled/Group COWRR: SR/M. <br />18. DISTRIBUTION STATEMENT 19. SECURITY CLASS 21. NO. OF PAGES <br /> (THIS REPO" 46 <br />Available from the National Technical Information Service <br />O <br />erations Divi <br />io UNCL4991FIED <br />, <br />p <br />s <br />n, <br />5285 Pon Royal Road, Spilggfield, Virginia 22161. 20. SECURITY CLASS 22. PRICE <br />_ (THIS PAGE) <br /> UNCLASSIRED