Glacial Geology Map of the Toolik Lake and Upper Kuparuk River Region, Alaska


This data set consists of a digital glacial geology map of the Toolik and upper Kuparuk River region, Alaska, USA. The map covers a 740 km² area on Alaska's North Slope, in the northern foothills of the Brooks Range. The map contains polygon and line features, annotation, and legends and is distributed as an ArcInfo GIS interchange (.e00) file or shapefiles. The data set describes substrate only and does not include topographic, hydrographic, or cultural features.

The map is designed to be used in conjunction with the report Glacial Geology of Toolik Lake and the Upper Kuparuk River region by Thomas D. Hamilton. To access this report in PDF format, please visit the Circumpolar Arctic Geobotanical Atlas, Upper Kuparuk Maps site. The site also provides printable versions of the glacial geology map.

This research was funded by the Arctic System Sciences (ARCSS) Program, grant number OPP-9908829.

Data are available for ordering through NCAR.

Citing These Data

Walker, D.A., T.D. Hamilton, A.W. Balser, and J.A. Anderson. 2003. Glacial Geology Map of the Toolik Lake and Upper Kuparuk River Region, Alaska. Boulder, CO: National Center for Atmospheric Research, ARCSS Data Archive.

Overview Table

Category Description
Data format ArcInfo interchange file and shapefiles
Spatial coverage Toolik and upper Kuparuk River region, Alaska, from 68.48º N to 68.74º N, and 149.02º W to 149.67º W
Temporal coverage The map shows features that are approximately 350,000 years before present (ybp) to present.
File size 1.5 MB (ArcInfo export file); 625KB to 918 KB (shapefiles)
Parameter(s) Glacial geologic unit, glacial landforms/processes, landscape pattern, glaciation, sedimentation

Table of Contents

1. Contacts and Acknowledgments
2. Detailed Data Description
3. Data Access and Tools
4. Data Acquisition and Processing
5. References
6. Document Information

1. Contacts and Acknowledgments

Investigator(s) Name and Title

Donald A. (Skip) Walker
Alaska Geobotany Center
University of Alaska Fairbanks
Fairbanks, AK, USA 99775-6780

Thomas D Hamilton
U.S. Geological Survey
Mineral Resources Team, Alaska
4200 University Drive
Anchorage, AK, USA 99508

Andrew W. Balser
GIS and Remote Sensing Manager
Toolik Field Station
311 Irving I
Institute of Arctic Biology
University of Alaska, Fairbanks
Fairbanks, AK, USA 99775-7000

James A. Anderson
Institute of Arctic and Alpine Research
University of Colorado, Boulder
UCB 450
Boulder, CO, USA 80309

Technical Contact:

2. Detailed Data Description


The data are available as an ArcInfo interchange file that imports as a coverage, and shapefiles, as described below.



Complete metadata are also available.

Additionally, image files representing these data are available.

File Size

The data file sizes are as follows:

Spatial Coverage

The bounding coordinates of the map are as follows:

Southernmost latitude: 68.48º N
Northernmost latitude: 68.74º N
Westernmost longitude: 149.67º W
Easternmost longitude: 149.02º W

Projection information:

Projection: Albers Equal Area
Units: Meters
Datum: NAD27
First Standard Parallel:  55º 0' 0" N
Second Standard Parallel:  65º 0' 0" N
Central Meridian:  154º 0' 0" W
Latitude of Origin:  50º 0' 0" N
False Easting:  0.0
False Northing:  0.0

Spatial Resolution

The resolution of the map is 50 m, which represents the smallest discernable polygon.

Temporal Coverage

The map represents a temporal coverage approximately 350,000 years before present to the present day.

Parameters or Variables

Parameter Description

Geographic features are represented as polygons (glacial geology units), and lines (drainage channels, divide crossings, and unit boundaries). The keys to the polycode and linecode attributes (coverage and shapefile) appear in the Entity and Attribute Information section of the metadata files.

The attributes in the "geolmap_poly" shapefile correspond to the entity GEOLMAP.PAT, and the attributes in the "geolmap_line" shapefile correspond to the entity GEOLMAP.AAT.

Unit of Measurement


Sample Data Record

The following image, "25kggeol.jpg," is a JPEG version of the glacial geology map. The resolution is lower than the publication-quality TIFF version ("geolmap_pub.tif.gz"). This file is also available for ordering through NCAR.

Glacial geology map (.jpg version)

Glacial geology map of the Toolik Lake and Upper Kuparuk River region, Alaska. Image by Dr. Donald Walker, University of Alaska Fairbanks.

Quality Assessment

The data are estimated to have positional accuracy to within 50 m and were created with the greatest spatial accuracy possible; however, they are not guaranteed to conform to national map accuracy standards for maps at 1:25,000 scale.

Attribute accuracy is considered 100%, except for POLYCODES that contain a "?" after the code. These are presumed accurate, but lack field confirmation.

3. Data Access and Tools

Data Access

Data are available through NCAR.

Software and Tools

To use the interchange file, users must have ArcInfo GIS software. Shapefiles can be used with GIS or image processing software, such as ENVI, PCI, or ERDAS.

Related Data Collections

4. Data Acquisition and Processing

Data were developed from a combination of airphoto interpretation and in situ measurements. The source photos were 100% cloud free.

The airphoto was an orthorectified, panchromatic hardcopy at 1:25,000 scale.

Polygons and lines were digitized manually from the airphoto, and attributes were added based on field reconnaissance.

5. References and Related Publications

Hamilton, T.D. 2002. Glacial Geology of the Toolik Lake and Upper Kuparuk River Region. Edited by D.A. Walker. Biological Papers of the University of Alaska. University of Alaska Fairbanks, Institute of Arctic Biology, Fairbanks, AK. ISSN: 00568-8604. 14 October 2003.

Hamilton, T.D. 1978. Surficial geologic map of the Philip Smith Mountains quadrangle, Alaska. U.S. Geological Survey Miscellaneous Field Studies Map MF-879-A. Scale 1:25,000.

Circumpolar Arctic Geobotanical Atlas, Upper Kuparuk Maps. 14 October 2003.

6. Document Information

Document Creation Date


Document Revision Date

Document Review Date

Document URL