PermafrostPolygons permafrost map unit polygons Pingo locations of pingos Locality locations of five sites discussed in the text Outline outline shape of the study area
Reger, R.D., and Solie, D.N., 2008, Reconnaissance interpretation of permafrost, Alaska Highway corridor, Delta Junction to Dot Lake, Alaska: Preliminary Interpretive Report PIR 2008-3C, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.0000001
Ordinates (y-coordinates) are specified to the nearest 0.0000001
Planar coordinates are specified in meters
The horizontal datum used is North American Datum of 1927.
The ellipsoid used is Clarke 1866.
The semi-major axis of the ellipsoid used is 6378206.4.
The flattening of the ellipsoid used is 1/294.978698.
|Codeset Source:||Alaska Division of Geological & Geophysical Surveys <http://www.dggs.alaska.gov/metadata/PIR2008-3C_codeset.pdf>|
A, B, C, D
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pingos shown on map
shape of map area
This research was supported by Alaska State Capital Improvement Projects funding.Additional Acknowledgments: Most of the background knowledge for this permafrost interpretation was learned during preconstruction geotechnical investigations for the trans-Alaska oil pipeline system (Kreig and Reger, 1976, 1982), with input based on early investigations by Alyeska Pipeline Service Company, R & M Consultants, Inc., and especially Mike Metz and Ray Kreig. Subsurface water well data were provided by Steven Squires. De Anne Stevens, Gary Carver and Santosh Panda collaborated in field observations and discussions. The report was reviewed by De Anne S.P. Stevens.
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This report and map are a part of ADGGS'sAlaska Natural Gas Pipeline Geology and Geohazards project, showing an interpretive evaluation of the presence or absence of permafrost in the study area. The study was done in anticipation of the proposed natural gas pipeline along the Alaska Highway corridor, as a preliminary look at the expected distribution of permafrost based on air photo interpretation.
Kreig, R.A., and Reger, R.D., 1976, Preconstruction terrain evaluation for the trans-Alaska pipeline project: Dowden, Hutchinson, and Ross, Stroudsburg, Pa., USA.
Coates, D. R., 1976, Geomorphology and engineering: Dowden, Hutchinson, and Ross, Stroudsburg, Pa., USA.
Kreig, R.A., and Reger, R.D., 1982, Air-photo analysis and summary of landform soil properties along the route of the Trans-Alaska Pipeline System: Geologic Report GR-66, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.
Ferrians, O.J., Jr., 1965, Permafrost map of Alaska: Miscellaneous Geologic Investigations Map I-445, U.S. Geological Survey, Menlo Park, CA, USA.
PÃ©wÃ©, T.L., and Reger, R.D., 1983, Middle Tanana River valley: Guidebook Guidebook 1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.
PÃ©wÃ©, T.L., ed., and Reger, R.D., ed., 1983, Guidebook to permafrost and Quaternary geology along the Richardson and Glenn Highways between Fairbanks and Anchorage, Alaska: Guidebook Guidebook 1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.
Data sources used in this process:
Reger, R.D., Stevens, D.S.P., and Solie, D.N., 2008, Surficial-geologic map, Alaska Highway Corridor, Delta Junction to Dot Lake, Alaska: Preliminary Interpretive Report PIR 2008-3a, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, UAS.
Reger, R.D., and Solie, D.N., 2008, Engineering-geology map, Alaska Highway Corriodr, Delta Junction to Dot Lake, Alaska: Preliminary Interpretive Report PIR 2008-3B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.
The permafrost interpretations were first hand-drawn, using a magnifying stereoscope, onto acetate air-photo overlays at the scale of the air-photos (approximately inch-to-the-mile). The air-photos were taken in August 1980. The presence or former presence of permafrost and the ground-ice content were inferred from several indicators, including vegetation, slope and aspect, landform, soil type, local drainage, and terrain features, such as open-system pingos, polygonal ground, and thermokarst pits, gullies, and ponds (Kreig and Reger, 1982). Permafrost classifications in areas that were burned just prior to August 1980 are less reliable than in unburned areas because the vegetation was destroyed or significantly altered and, in these areas, interpretation of permafrost was based only on landform and setting, which are less diagnostic than vegetation.During summer field work in 2007, a limited number of test pits was dug to verify initial interpretations. The accuracy of the map unit boundary locations vary due to the scale and interpretive nature of the mapping, but are expected to be accurate to at least 500 ft. Map units labeled with a "?" are considered to have an uncertain assignation due to conditions such as in recently burned areas, areas in which considerable surface water is present on landforms that woudl normally be frozen, in artificial clearings, and in Delta-age kettle fillings with uncertain thickness of peat.
The permafrost interpretations were first hand-drawn, using a magnifying stereoscope, onto acetate air-photo overlays at the scale of the air-photos (approximately inch-to-the-mile). The accuracy of the map unit boundary locations vary due to the scale and interpretive nature of the mapping, but are expected to be accurate to at least 500 ft.The acetate overlays were then individually scanned and orthorectified, using Orthomapper, v. 3.6, and georeferenced. The air-photos were orthorectified, photomosaiced and georeferenced. Permafrost unit boundaries were digitized on-screen into ArcGIS from the orthorectified overlays at a scale more detailed than 1:63,360, using a combination of a USGS topographic 1:63.360 map layer and the air-photo photomosaic layer to verify the position of the lines. Location of points on map that are discussed in the text were recorded usinga Garmin GPS model 76CSx with a horizontal error of 4 meters or less.
This dataset includes coverages that contain information about the interpreted presence and ice content of permafrost in the map area, pingoes, and localities discussed in the report. Subsurface permafrost data were not available for use in creating this map coverage. This report uses the definition of permafrost as rock or soil that remains continuously colder than 0 degrees C (32 degrees F) for two years or longer.
Polygon topology is present on appropriate coverages; others are line or point coverages.
Are there legal restrictions on access or use of the data?
- This report, map, and/or dataset are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
- Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.
Preliminary Interpretive Report PIR 2008-3C
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