Descriptions and elevations for first-order, class II leveling bench marks, and Global Positioning System (GPS) coordinates and elevations between West Yellowstone, Montana and Old Faithful, Yellowstone National Park, Wyoming
Yamashita KM, Endo EE, Sake MM, Wieprecht DD. 1997. Descriptions and elevations for first-order, class II leveling bench marks, and Global Positioning System (GPS) coordinates and elevations between West Yellowstone, Montana and Old Faithful, Yellowstone National Park, Wyoming. U.S. Geological Survey (USGS) Open-File Report. 97-57. United States Geological Survey. Reston, VA
In August 1996 the Cascades Volcano Observatory (CVO), U.S. Geological Survey (USGS), acquired a Wild® NA3003 digital level. This instrument "reads" a bar code rod (similar to the bar code on grocery items). The infrared spectrum of the light entering the instrument is separated from the visible band. This infrared portion, carrying the light and dark stripes of the rod, is then compared with a stored electronic image of the bar code. The observed image is shifted until it exactly matches the electronic image, yielding a height of the rod to the nearest .0001 m and the stadia distance to 0.01 m. The data can then be automatically stored in a REC module (a RAM module) and downloaded to a PC at a later time or be directed out a serial port to a portable computer. A REC module will store about 1140 height differences (64 K byte). This report contains descriptions for all bench marks along the leveling line. Figures 1-5 show the location of the bench marks along the leveling line, figure 6 the location of the leveling line in relation to the rest of Yellowstone National Park, figure 7 a graph showing the change in elevation from 1987 to 1996 and a cross-section of the topography along the leveling route, and figure 8 a graph showing the difference between the ellipsoidal and the orthometric heights. Table 4 contains bench mark identification, elevation difference between adjacent marks and elevation relative to bench mark B144 which we have held as "fixed", table 5 contains rapid static GPS coordinates and ellipsoidal heights (subject to change with further processing), and table 6 contains orthometric heights from the leveling survey, GPS ellipsoidal heights, and the difference in elevations between the two heights.
- Type
- Published Report
- Authors
- Yamashita, Kenneth; Endo, E; Sake, M; Wieprecht, D
- Date of Issue
- 1997
- Publisher
- United States Geological Survey
- Units
- HIST , YELL
- Keywords
- Benchmarks, coordinates, ehistory, Elevation, Geology, Global Position System (GPS), History, Old Faithful, West Yellowstone