This data set consists of bedrock and surface elevation readings taken by ground penetrating radar (GPR) and Global Positioning System (GPS) on Roosevelt Island, an ice dome within the Ross Ice Shelf. Locations were validated by GPS readings of poles set in the surface snow. The data was collected between November and December, 1997.
Data are available via ftp, and are provided in a text file with an accompanying file that provides GPS locations. Surface and bedrock elevations are given in meters above WGS84.
Conway, H. 1998. Roosevelt Island Bedrock and Surface Elevations. Boulder, CO: National Snow and Ice Data Center. http://dx.doi.org/10.7265/N51J97NB.
|Data format||Text files|
|Spatial coverage and resolution||Roosevelt Island on the Ross Ice Shelf|
|Temporal coverage and resolution||November and December, 1997|
|Tools for accessing data||No special tools required|
|File naming convention||Data file is named checks.txt. The file listing all the pole locations is named risdgps.txt.|
|File size||15 Kb, combined|
|Parameter(s)||surface elevation, bedrock elevation|
|Procedures for obtaining data||Data are available via FTP.|
Howard Conway, Research Professor, University of Washington
NSIDC User Services
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
Boulder, CO 80309-0449 USA
phone: +1 303.492.6199
fax: +1 303.492.2468
form: Contact NSIDC User Services
Data are available in a text file. There is also a file containing data for elevation profiles.
The checks.txt file is 2 Kb. The pole location file (risdgps.txt) is 13 Kb.
Southernmost_Latitude: 79.5906 S
Northernmost_Latitude: 79.4480 S
Westernmost_Longitude: 161.5307 W
Easternmost_Longitude: 159.8077 W
Data were collected during November and December, 1997.
Bed and surface elevations were measured at 15 locations.
Profiles in the experiment refer to the traverses the investigator made across the island.
Bed and surface elevation are measured in meters above WGS84. (WGS 84 is an earth fixed global reference frame. For more information, see wgs84.com.)
Data are available via FTP.
Data are available at no cost.
Most browsers and word processing applications can open text files. No special software or tools are necessary.
Readings were taken by GPR and GPS to determine bedrock depth and position.
Map view of Roosevelt Island radar image of A-line; the bright reflector at the bottom is the bedLocations were validated by GPS readings of poles set in the surface snow. The data was collected between November and December, 1997. The following map shows an "X" at each poles location and the traverse line in red. The traverse extends onto the ice shelf at each end. The positions are defined in the data file named checks.txt.
Conway, H., B.L. Hall, G.H. Denton, A.M. Gades, E.D. Waddington. 1999. Past and Future Grounding-Line Retreat of the West Antarctic Ice Sheet. Science 286:280-283
The following acronyms and abbreviations are used in this document.
|FTP||File Transfer Protocol|
|GPR||Ground Penetrating Radar|
|GPS||Global Positioning System|
2 May 2003