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Data Set ID:

Roosevelt Island Bedrock and Surface Elevations, Version 1

This data set consists of bedrock and surface elevation readings taken by ground penetrating radar 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.

Geographic Coverage

  • Glaciers/Ice Sheets > Glacier Elevation/Ice Sheet Elevation
  • Glaciers/Ice Sheets > Glacier Topography/Ice Sheet Topography
  • Snow/Ice > Ice Depth/Thickness
  • Glaciers/Ice Sheets > Ice Sheets
  • Topography > Landforms
  • Topography > Terrain Elevation
  • Topography > Topographical Relief
  • Topography > Topographic Effects
Spatial Coverage:
  • N: -79.3539, S: -79.5906, E: -159.8077, W: -161.5307

Spatial Resolution: Not Specified
Temporal Coverage:
  • 11 November 1997 to 12 December 1997
Temporal Resolution: Not specified
Data Format(s):
  • ASCII Text
Platform(s) AIRCRAFT
Version: V1
Data Contributor(s): Howard Conway
Data Citation

As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.

Conway, H. 2003. Roosevelt Island Bedrock and Surface Elevations, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: [Date Accessed].

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Detailed Data Description


Data are available in a text file. There is also a file containing data for elevation profiles.

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File Size

The checks.txt file is 2 Kb. The pole location file (risdgps.txt) is 13 Kb.

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Spatial Coverage

Southernmost_Latitude: 79.5906 S
Northernmost_Latitude: 79.4480 S
Westernmost_Longitude: 161.5307 W
Easternmost_Longitude: 159.8077 W

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Temporal Coverage

Data were collected during November and December, 1997.

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Parameter or Variable

Parameter Description

Bed and surface elevations were measured at 15 locations.
Profiles in the experiment refer to the traverses the investigator made across the island.

Unit of Measurement

Bed and surface elevation are measured in meters above WGS84. (WGS 84 is an earth fixed global reference frame. For more information, see

Sample Data Record

AW208 ATline 79.4839 161.0559 -230 488.8
AW208 Aline 79.4838 161.0554 -236 488.8
A00 Aline 79.3539 160.3233 -276 222.4
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Software and Tools


Data are available at no cost.

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Software and Tools

Most browsers and word processing applications can open text files. No special software or tools are necessary.

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Data Acquisition and Processing

Data Acquisition Methods

Readings were taken by GPR and GPS to determine bedrock depth and position.

Bedrock depth chart
Map view of Roosevelt Island radar image of A-line; the bright reflector at the bottom is the bed

Locations 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.

Pole location map
Traverse map

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References and Related Publications

Contacts and Acknowledgments

Howard Conway, Research Professor, University of Washington

Document Information

Document Creation Date

2 May 2003

No technical references available for this data set.
No FAQs or How Tos available for this data set.

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