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Displaying entries 1 - 20 of 81 in total

Seward Peninsula Range Mapping (Swanson et al. 1985)

Aga seward vegetation swanson 1985 Alaska Geobotany Center (AGC) - In 1976, the Northwest Alaska Native Association (NANA) and the Reindeer Herders Association (RHA) asked the Alaska Soil and Water Conservation District and the United States Department of Agriculture Soil Conservation Service (SCS) for assistance in developing and applying range management plans for reindeer. In response the SCS carried out a 15 million acre survey of 19 reindeer grazing...
Complete
2019-08-16 12:28:52 -0800
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Landsat MSS-derived land-cover map of the Seward Peninsula, Alaska

Aga seward landcover thayer snyder 2000 Alaska Geobotany Center (AGC) - This land cover map of the Seward Peninsula is based on a classification of Multi-Spectral Scanner (MSS) data. The Landsat multiple scene mosaic was furnished by the USGS, EROS Data Center, and an Isoclass clustering algorithm used to arrive at 10 broad land-cover classes. **References** Raynolds, M.K., Martin, C.R., Walker, D.A., Moody, A., Wirth, D., Thayer-Snyder, C. 2002. ATLAS...
Complete
2019-08-19 12:08:35 -0800
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Alaska Arctic Bioclimate Subzone Map

Aga arctic ak bioclimate 2005 Alaska Geobotany Center (AGC) - Various authors, working with different geobotanical traditions, have divided the Arctic into bioclimatic regions using a variety of terminologies. The origins of these different terms and approaches have been reviewed by the Panarctic Flora (PAF) initiative (Elvebakk 1999). The PAF and CAVM accepted a five-subzone version of the Russian zonal approach. The subzone boundaries are somewhat...
Complete
2019-08-15 13:34:19 -0800
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Upper Kuparuk River Region SPOT CIR

Aga upper kuparuk spot cir 1995 Alaska Geobotany Center (AGC) - The French SPOT satellite data (20-m resolution) were obtained on 28 July 1989 and provides a view of the mapped region from space. The false-color infrared image shows more densely vegetated areas as brighter red tones. When compared with the glacial geology map, the older Sagavanirktok-age glacial landscapes have few lakes and redder tones indicating more dense vegetation, and the younger...
Complete
2019-08-14 14:49:45 -0800
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Upper Kuparuk Glacial Geology

Aga upper kuparuk glacialgeol simplified hamilton 2003 Alaska Geobotany Center (AGC) - This vector (shp) map is a simplified version (1:25000) of Thomas Hamilton's glacial geology map of the Upper Kuparuk River region (Hamilton 2003), which provides detailed (1:63,360-scale) surficial-geologic mapping in the Dalton Highway area, from the Sagavanirktok to the Itkillik Rivers, in the west-central Philip Smith Mountains quadrangle. The map area extends from the northern flank of the...
Complete
2019-08-14 15:05:28 -0800
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Circumpolar Arctic AVHRR NDVI Trend 1982-2008 (Bhatt et al. 2010)

Aga circumpolar avhrr ndvi 1995 Alaska Geobotany Center (AGC) - The normalized difference vegetation index (NDVI) is a measure of greenness. NDVI was calculated as: NDVI = (NIR - R) / (NIR + R), where NIR is the spectral reflectance in the AVHRR near-infrared channel (0.725-1.1 µm, channel 2) where light-reflectance from the plant canopy is dominant, and R is the reflectance in the red channel (0.5 to 0.68 µm, channel 1), the portion of the spectrum where...
Complete
2019-08-15 13:35:35 -0800
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Kuparuk River Basin Landsat False-CIR Image

Ku cir u6 Alaska Geobotany Center (AGC) - Kuparuk River Basin False Color-Infrared (CIR) image - Registered and rectified CIR image created in ENVI from the MSS image. It is a raster map (tiff), with 30-m pixel resolution. Back to [Kuparuk River Basin](/catalog/entries/5450-kuparuk-river-basin-vegetation-map-walker-1997) Go to **Website Link :: Toolik Arctic Geobotanical Atlas** below for details on legend units, photos of map...
Complete
2019-08-15 14:10:06 -0800
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Kuparuk River Basin Hydrology Map

Ku hydro Alaska Geobotany Center (AGC) - Hydrology of the Kuparuk River basin, including streams, rivers, ponds, lakes, and coastline. The map includes line features as well as polygon features (.shp). This map was drawn by Skip Walker, derived by interpreting the CIR version of the GTOPO30 Landsat MSS image created in 1999 by Jiong Jia. Back to [Kuparuk River...
Complete
2019-08-15 14:07:37 -0800
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Prudhoe Bay 1949 BAR Photography WMS

Prudhoe bay 1949 wms Alaska Geobotany Center (AGC) - WMS feed for 1949 BAR photography mosaic for the Prudhoe Bay region. Raw data is available on request, contact GINA at: support@gina.alaska.edu, with data request.
Complete
2019-08-16 12:05:45 -0800
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Sagwon Patterned-Ground 10 x 10 m Grids

Aga sagwon acidic vegetation 2006 Alaska Geobotany Center (AGC) - The Sagwon patterned-ground grids are located at the northern edge of the rolling foothills, at the boundary with the flatter coastal plain. This is also the boundary between Subzones E and D, and between the acidic tundra to the south and the nonacidic tundra to the north. There are three 10 x 10 m grids, one with acidic tussock-sedge, erect dwarf-shrub, moss vegetation (MAT), and two grids in...
Ongoing
2019-08-16 13:55:37 -0800
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Alaska Arctic Elevation Map

Aga arctic ak elevation 1993 Alaska Geobotany Center (AGC) - Elevation strongly influences soil moisture and patterns of tundra plant communities. Areas less than 100 m above sea level were separated to show low-elevation plains. Areas above 100 m elevation were divided into 333-m intervals to show decreases of about 2 °C, as predicted by the adiabatic lapse rate of 6 °C per 1000 m. This corresponds to the change in mean July temperature between...
Complete
2019-08-19 12:54:01 -0800
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Toolik Lake Area Surficial Geomorphology

Aga toolik area surfgeom walker 2008 Alaska Geobotany Center (AGC) - Map of the Toolik Lake research area surficial geomorphology . The Toolik Lake area map is near the western boundary of the Upper Kuparuk River region map and encloses a 20-km^2 area surrounding Toolik Lake that stretches from the Dalton Highway on the east to Jade Mountain on the west. It includes the Toolik Lake Field Station, the old Toolik Lake pipeline construction camp gravel pad and...
Complete
2019-08-19 14:16:48 -0800
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Alaska Arctic Substrate Chemistry Map

Aga arctic ak substrate 2005 Alaska Geobotany Center (AGC) - Differences in substrate chemistry, including pH, govern the availability of essential plant nutrients. Soils in the circumneutral range (pH 5.5-7.2) are generally mineral rich, whereas the full suite of essential nutrients is often unavailable in acidic soils (pH < 5.5) or in soils associated with calcareous bedrock (pH > 7.2). The latter often have unique assemblages of plant species. The...
Complete
2019-08-19 13:58:49 -0800
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Toolik Lake Grid Percent Water

Aga toolik grid pctwtr walker 2008 Alaska Geobotany Center (AGC) - The Toolik Lake Grid map focuses on the south side of Toolik Lake. This area is one of the principal intensive research areas at the Toolik Lake Field Station. It includes many experimental research sites where long-term observations and experiments are being conducted, including the greenhouse and snow-fence experiments. The grid was constructed in 1989 to provide geographic referencing for...
Complete
2019-08-19 14:19:05 -0800
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Alaska Arctic Landscape Map

Aga arctic ak landscape 2005 Alaska Geobotany Center (AGC) - The landscape physiography map displays regions of plains, hills, mountains, glaciers and lakes. Generally, plains are flat or gently rolling landscapes less than 200 m above sea level. Hills are more dissected than plains (more surface roughness) and are 200-500 m in elevation. Mountains have greater surface roughness and are above 500 m in elevation. The Alaska Arctic Tundra Vegetation Map is...
Complete
2019-08-19 13:58:19 -0800
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Toolik Lake Grid Digital Elevation Map (DEM)

Aga toolik grid dem buchhorn 2015 Alaska Geobotany Center (AGC) - This Digital Elevation Map (DEM) was created from the contour lines of the Aerometrics orthophoto from 1996. In addition the 1 x1 km CALM grid with 121 points (every 100 m) was resurveyed in summer 2014 with a Topcon RTK. This RTK data as well as a lake and river layer was included in the DEM creation. The DEM accuracy is = +/- 1m. **Back to:** [Toolik Lake Grid...
Complete
2019-08-20 12:31:49 -0800
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Barrow

Alaska Geobotany Center (AGC) - D. A. Walker IBP site and topogrid with 7 themes. These are currently in a paper/mylar version and need to be digitized. Once complete, they will be available for download here. D. A. Walker. 1977. The Analysis of the Effectiveness of a Television Scanning Densitometer for Indicating Geobotanical Features in an ice-Wedge Polygon Complex at Barrow, Alaska. M.A. University of Colorado, Boulder.
Unknown
2019-08-14 13:59:49 -0800
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Landsat Land Cover Map of Northern Alaska (Muller et al. 1999)

Aga northslope landcover muller 1999 This map was created for the US National Science Foundation Land-Atmosphere-Ice Interactions (LAII) Flux Study and the Arctic Transitions in the Land-Atmosphere System (ATLAS) Study (OPP-9318530 and OPP-9415554). The map covers all of northern Alaska, from the Brooks Range divide to the coast. It is a raster (tif) map, with 50 m pixels, and 9 land cover categories. It is based on an...
Complete
1998-06-01
2019-08-02 12:01:37 -0800
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Alaska Arctic Vegetation Archive: Nome (Hanson 1953)

Nome%20%28nome hh%29 Alaska Geobotany Center (AGC) - Sampling of tundra vegetation in the vicinity of Nome on the Seward Peninsula was undertaken as part of a classification of the major vegetation types during broader surveys for reindeer winter lichen range in northwestern Alaska. The primary source document for this dataset is Hanson (1953). The work was funded in part by the Arctic Institute of North America with funds provided by the Office...
Complete
1951-07-30
1951-08-02
2019-08-13 14:27:52 -0800
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Upper Kuparuk River Region Surficial Geomorphology

Aga upper kuparuk surfgeom walker 2008 Alaska Geobotany Center (AGC) - The surfaces of the landscapes in the Toolik Lake region have been modified by a variety of geomorphological processes including alluviation (movement of material by water), colluviation (movement of material by gravity) and periglacial processes (freezing and permafrost-related phenomena). Many of the surface forms have been described for the Imnavait Creek region (Walker and Walker 1996)....
Complete
2019-08-14 15:09:14 -0800
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