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Geologic Trail Maps of the Grand Canyon

Geologic Trail Maps of the Grand Canyon
Geologic Trail Maps of the Grand Canyon
Geologic Trail Maps of the Grand Canyon
Geologic Trail Maps of the Grand Canyon
Geologic Trail Maps of the Grand Canyon
Geologic Trail Maps of the Grand Canyon
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  • Contest: 2019 Best Overall Cartography
  • Submitter: Anna Riling
  • Email: annariling@gmail.com
  • Authors: Anna Riling
  • Organization: University of Denver
  • Description: These maps combine a geologic trip log and guidebook with the utility of a topographic trail map. The concept is for anyone, regardless of geologic or navigational aptitude, to use the map on a hike and gain a deeper understanding of the Canyon’s geology by pausing at each “Geology Stop” to read about and observe a geologic feature of interest, such as stream piracy, the Tanner Graben or the Great Unconformity. The map also contains trail info, including elevation profile, water sources, backcountry zoning, and history. On the reverse of each map is the map unit legend and a series of graphics, photos, and information about the geology of the Canyon. The color scheme from the rock units on the map is continued through to the graphics on the reverse, i.e. Proterozoic information is generally pink, Paleozoic is blue, and so on. Almost every feature on the map is data driven, including the Geology Stop info, trail stats, elevation profile, even the cover photo and trail name. The unfolded size is 18” x 24”, and the folded size is 6.25” x 4”. I produced maps for Hermit, Tanner, and Grandview Trails, and I’d like to do many more!
  • Data Sources: The maps were created with ArcGIS Desktop 10.6 with post-export editing done in PDF-Xchange Editor. I used the NPS Geologic Resources Inventory (GRI) GIS data, including geologic units and structural features, based on USGS maps by George Billingsley. This data source used a scale of 1:100,000 and features are within 166.7 feet horizontally of their actual location. My maps use the scale of the digital data source (1:24,000); a brief explanation of scale and accuracy is included in the map. Park features such as trailheads, trails, backcountry zoning, rapids, and river miles were obtained from NPS and USGS Grand Canyon Monitoring and Research Center. General points of interest, overlooks, and landmarks were digitized from USGS topographic maps. USGS 10-meter DEMs were used for surface and 3D analysis, including contours, elevation profile, elevations of points of interest and Geology Stops. Faults were derived from the GRI dataset and the “Preliminary integrated geologic map databases for the United States” (Ludington, et al). Many photos were taken by me and my friends, and others are public domain or used with permission or attribution. Graphics and text are based on many sources, and all sources are cited on the reverse side.