eng_geology polygons of surficial-geologic map units outline outline shape of the study area
Reger, R.D., and Solie, D.N., 200812, Engineering-geologic map, Alaska Highway corridor, Delta Junction to Dot Lake, Alaska: Preliminary Interpretive Report PIR 2008-3B, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska - USA.Online Links:
This is a Vector data set.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.000000001
Ordinates (y-coordinates) are specified to the nearest 0.000000001
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.
shape of map area
| Formal codeset | |
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| Codeset Name: | PIR2008-3B_codeset.pdf |
| Codeset Source: | Alaska Division of Geological & Geophysical Surveys <http://www.dggs.alaska.gov/metadata/PIR2008-3B_codeset.pdf> |
This research was supported by Alaska State Capital Improvement Projects funding. The authors gratefully acknowledge the helpful review by De Anne Stevens, and able cartographic assistance by Kyle Obermiller.
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This map is a part of ADGGS's Alaska Natural Gas Pipeline Geology and Geohazards project, mapping the geology, geohazards and resources along the the Alaska Highway between Delta Junction and Dot Lake. The study was done in anticipation of the proposed natural gas pipeline along the Alaska Highway corridor, to further the geologic understanding of the area andas a basis for evaluating geohazards and resources for proposed infrastructure.
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.
Pewe, T.L., and Reger, R.D., 1983, Middle Tanana River valley: Guidebook Guidebook 1, Alaska Division of Geological & Geophysical Surveys, Fairbanks AK.
Pewe, 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.
Carter, L.D., and Galloway, J.P., 1978, Preliminary engineering geologic maps of the proposed natural gas pipeline route in the Tanana River valley, Alaska: Open-file report OFR 78-794, U.S. Geological Survey, United States.
Mason, O.K., and Beget, J.E., 1991, Late Holocene flood history of the Tanana River, Alaska: Arctic and Alpine Research, United States.
Yarie, John, Viereck, Leslie, Van Cleve, Keith, and Adams, Phyllis, 1998, Flooding and ecosystem dynamics along the Tanana River: BioScience, United States.
Reger, R.D., Stevens, D.S.P., and Solie, D.N., 200812, 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.
Data sources used in this process:
Reger, R.D., and Solie, D.N., 200809, Reconnaissance interpretation of permafrost, Alaska Highway corridor, Delta Junction to Dot Lake, Alaska: Preliminary Interpretive Report PIR 2008-3C, Alaska Division of Geological & Geophysical Surveys, Fairbanks AK.
Carver, G.A., Bemis, S.P., Solie, D.N., and Obermiller, K.E., 200812, Active and potentially active faults in or near the Alaska Highway corridor, Delta Junction to Dot Lake, Alaska: preliminary interpretive report PIR 2008-D, Alaska Division of Geological & Geophysical Surveys, Fairbanks AK.
Solie, D.N., Werdon, M.B., Newberry, R.J., Freeman, L.K., and Lessard, R.R., 200802, Major-oxide, minor-oxide, trace-element and geochemical data from rocks collected in the Alaska Highway corridor, Mount Hayes quadrangle, Alaska in 2006 and 2007: Raw-data File RDF 2008-2, Alaska Division of Geological & Geophysical Surveys, Fairbanks AK.
Reger, R.D., Stevens, D.S.P., and Solie, D.N., 200812, Surficial geology, Alaska Highway corridor, Delta Junction to Dot Lake, Alaska: Preliminary Interpretive Report PIR 2008-3A, Alaska Division of Geological & Geophysical Surveys, Fairbanks AK.
Initial reconnaissance field observations were made in 2006, after which surficial geology air-photo interpretations were done. Engineering-geologic map units were derived from the surficial-geologic map (PIR 2008-3A). Physical properties of engineering-geologic map units are interpretive, based on extrapolation from verified localities and from previously published reports and data. Potential geologic hazards are inferred from the typical physical properties of map units, including sediment texture and ground-ice content, and their typical topographic settings. Except for a few test pits, no subsurface investigations or laboratory analyses were performed for this publication. The reader is cautioned that this map is intended only as a general guide, and that unevaluated geologic resources and hazards may be present. Detailed geotechnical investigations should be conducted prior to utilization of any map units for engineering purposes.
The engineering-geologic map units were derived from the surficial-geologic map (PIR 2008-3A). The surficial-geologic map contacts were first hand-drawn, using a magnifying stereoscope, onto acetate overlays registered to 1:50,000-scale (nominal) prints of digital aerial photographs. The horizontal accuracy of the map unit boundary locations varies due to the scale and interpretive nature of the mapping, but is expected to be accurate to at least 15 m. The 400dpi digital air photos were orthorectified using OrthoMapper 3.6 with an RMS error generally constrained to be less than 4 pixels, equating to approximately 20 m on the ground, although some areas with rugged terrain have larger errors. The individual orthophotos were mosaicked using Erdas Imagine 9.2 and ArcGIS 9. The acetate overlays were individually scanned and orthorectified using OrthoMapper based on the same equations developed for generating the orthophotos. Map unit boundaries were digitized on-screen into ArcGIS from the orthorectified overlays at a scale of approximately 1:25,000, using a combination of a digital USGS topographic 1:63,360-scale map layer (DRG) and the orthophoto mosaic layer to verify the position of the lines. Total horizontal accuracy of the mapped surficial-geologic contacts is thus on the order of 25 m or better, with somewhat lesser accuracy expected in areas of rugged relief.
This dataset includes coverages that contain information about the mapped and interpreted engineering-geologic deposits in the map area. Subsurface data were not available for use in creating this map coverage, other than about 10-15 soil pits dug to depths no more than 1.3 m, observations of exposures in gravel pits, highway cuts, and river banks, and drillhole data from geotechnical reports written by the Department of Transportation and Public Facilities for highway construction projects. No analytical tests were conducted for this report. The table describes engineering propoerties that are generally present in the mapped surficial deposits, but local variations and exceptions are most certainly to be expected. The reader is therefore cautioned that this map is intended only as a general guide, and that unevaluated geologic resources and hazards may be present. Detailed geotechnical investigations should be conducted prior to utilization of any map units for engineering purposes.
Polygon topology is present on appropriate coverages
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Preliminary Interpretive Report PIR 2008-3b
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