Abstract

A Custom Projection for Lake Powell Designed Using ArcGIS
Track: Cartography and Map Production
Authors: David Minkel, Michael Dennis, Lex Newcomb

A custom projection was designed entirely within ArcGIS software for Glen Canyon National Recreation Area (GCLA), which encompasses Lake Powell. This was necessary because existing coordinate systems such as UTM and State Plane do not provide an optimal solution for many high-accuracy GIS applications due to GCLA's size (over 1.2 million acres), high elevation (average above 4500 feet), and location (in both Utah and Arizona). The custom projection was designed to minimize the difference between its "grid" distances and actual "ground" distances, a desirable characteristic for surveying and engineering applications. Implementing such a coordinate system is facilitated by availability of accurate geodetic control; the National Geodetic Survey is assisting the National Park Service in establishing control throughout GCLA. Using the geodetic control and custom projection with modern GIS technology improves management of park operations, including Facilities, Maintenance, Visitor Protection, Environmental Monitoring, and ACE (Architecture, Construction, and Engineering) projects.

David Minkel
National Geodetic Survey
1616 W Adams Street
Phoenix, Arizona 85007
United States
Phone: 602-542-1569
E-mail: dave.minkel@noaa.gov

Michael Dennis
Geodetic Analysis LLC
8775 S Cluff Ranch Road
Pima, Arizona 85543
United States
Phone: 928-322-0956
E-mail: mld@geodeticanalysis.com

Lex Newcomb
National Park Service
Glen Canyon NRA
691 Scenic View Drive
Page, Arizona 86040
United States
Phone: (928) 608-6271
E-mail: Lex_Newcomb@nps.gov