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128 results found Displaying entries 41 - 60 of 128 in total

Alaska Arctic Vegetation Archive: Umiat (Churchill 1955)

Umiat%28umiat ec%29 Early vegetation sampling on Alaska’s North Slope was undertaken by Ethan D. Churchill while stationed at Umiat on the Colville River. Churchill’s field work, completed in July and August of 1951, endeavored to identify plant communities, determine their relationship to environmental conditions, and obtain data for aerial photographic interpretation. The work was supported in part by the U.S....
Complete
1951-07-01
1951-08-31
2018-08-09 15:11:54 -0800
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Alaska Arctic Vegetation Archive: Unalaska Vegetation Plots (Talbot et al. 2010)

Aava unalaska stalbot 2010 sitephoto In 2007, one of the first quantitative studies of vegetation from sea level to alpine on Unalaska Island in the Aleutian Islands was completed (Talbot et al. 2010). The focus of the study was to 1) describe the major plant communities along environmental gradients, 2) identify the main vegetation types and communities and determine their relationship to select site factors, and 3) compare these...
Complete
2007-08-03
2007-08-22
2018-08-09 15:17:19 -0800
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Alaska Arctic Vegetation Archive: Western Alaska Vegetation Plots (Hanson 1951)

Hhanson 1951 ecol monograph plantcomm westalaska page 30 image 0002 Sampling of grassland, marsh and other plant communities across Alaska was completed by Hanson (1951) to learn about community floristic composition, cover, frequency, environmental relationships, geographic distribution, and relationships between communities and plant succession. Stands were sampled in the vicinity of Kodiak, Homer, Eklutna, Goose Bay, Knik Flats, Wasilla, Talkeetna Mountains,...
Complete
1949-08-10
1949-08-15
2018-08-09 15:11:54 -0800
Report
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Alaska Arctic Vegetation Archive: Willow Vegetation Plots (Schickhoff 2002)

Aava willows schickhoff 2002 a sitephoto metadata The riparian vegetation in arctic Alaska mainly consists of willow shrub communities that are functionally important components of arctic landscape ecosystems. Willow communities along a south-north transect from the Brooks Range to Prudhoe Bay were described by Schickhoff et al. (2002). Support for the project was provided by the Max Kade Foundation grant KADE-OCG 3088 to U. Schickhoff, by the...
Complete
1997-07-09
1997-08-17
2018-08-09 15:11:51 -0800
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Alaska Arctic Vegetation Archive: Yukon-Kuskokwim Delta Plots

In Progress.
Ongoing
2018-08-09 15:11:54 -0800
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Arctic Alaska AVHRR NDVI Map

Aga arctic ak avhrr ndvi 1995 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
2018-09-07 14:28:28 -0800
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Arctic Alaska Bioclimate Subzone Map

Aga arctic ak bioclimate 2005 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
2018-09-07 14:49:22 -0800
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Arctic Alaska Elevation Map

Aga arctic ak elevation 1993 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
2018-09-07 14:52:39 -0800
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Arctic Alaska False Color-Infrared (CIR) Map

Aga arctic ak avhrr cir 1995 Advanced Very High Resolution Radiometer (AVHRR) data were obtained from the USGS Global AVHRR 10-day composite data (http://edcdaac.usgs.gov/1KM/1kmhomepage.asp) (Markon et al. 1995). Glaciers and oceans were masked out using information from the Digital Chart of the World (ESRI 1993). The image is composed of 1 x 1-km pixels. The color of each pixel was determined by its reflectance at the...
Complete
2018-09-07 15:12:21 -0800
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Arctic Alaska Floristic Provinces Map

Aga arctic ak floristic 2005 The Arctic has a relatively consistent core ofplant species that occur throughout the circumpolar region, but there is also considerable east to west variation in regional floras, particularly in the southern bioclimate subzones. These differences are due to factors such as different histories related to glaciations, land bridges, and north-south trending mountain ranges that have influenced...
Complete
2018-10-09 13:33:03 -0800
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Arctic Alaska Lake Cover Map

Aga arctic ak lake cover 2005 1 Lake cover strongly affects the reflectance of the land surface over large areas of Alaska, and was useful for identifying extensive wetlands. Lake cover was based on the number of AVHRR water pixels in each mapped polygon, divided by the number of pixels in the polygon. Since the imagery has a pixel size of 1 km^2, lake cover is underestimated for areas with many small lakes. Pixels within 2...
Complete
2018-10-09 13:42:38 -0800
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Arctic Alaska Landscape Map

Aga arctic ak landscape 2005 The 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 a more...
Complete
2018-10-09 14:00:10 -0800
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Arctic Alaska Substrate Chemistry Map

Aga arctic ak substrate 2005 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
2018-10-09 14:04:05 -0800
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Arctic Alaska Vegetation Map

Aga arctic ak vegetation 2005 Mapped polygons at 1:7.5 million scale contain many vegetation types. The map portrays the zonal vegetation within each mapped polygon. Zonal sites are areas where the vegetation develops under the prevailing climate, uninfluenced by extremes of soil moisture, snow, soil chemistry, or disturbance, and are generally flat or gently sloping, moderately drained sites, with fine-grained soils...
Complete
2018-09-07 17:06:50 -0800
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Atqasuk

Komarkova maps with 2 themes. They are currently in a paper/mylar version and need to be digitized and will be available here in the future.
Unknown
2018-08-09 15:11:52 -0800
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Barrow

Walker IBP site and toporid 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.
Unknown
2018-08-09 15:11:52 -0800
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Beechey Point Land Cover Classification: CRREL Report 87-5

Aga beecheypointquad landsat vegetation 1987 This report presents a Landsat-derived land cover classification of the Beechey Point, Alaska, 1:250,000-scale quadrangle with descriptions of the major vegetation units. Eight Landsat-level units deri neds from multispectral scanner data, eleven photo-interpreted units, and eight common vegetation complexes are described and illustrated. Procedures of Landsat analysis, field methods, and...
Complete
1987-04-01
2018-08-09 15:11:56 -0800
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CANADIAN TRANSECT FOR THE CIRCUMPOLAR ARCTIC VEGETATION MAP (1999)

Gonzalez etal 2000 Variations in vegetation cover and species composition related to climate are evident from the southern to northern Arctic. Scientists involved in the Circumpolar Arctic Vegetation Mapping (CAVM) project and undergraduate students in a University of Minnesota field course conducted a north-south transect in the Canadian Arctic in order to investigate this large-scale variation in vegetation....
Complete
2000-05-01
2018-08-09 15:11:57 -0800
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Circumpolar Arctic AVHRR NDVI Trend 1982-2008 (Bhatt et al. 2010)

Aga circumpolar avhrr ndvi 1995 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
2018-10-09 19:17:41 -0800
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Circumpolar Arctic AVHRR Summer Warmth Index 1982-2003 (Raynolds et al. 2008)

Aga circumpolar avhrr swi 1982 2003 This data set was calculated from monthly AVHRR thermal infrared data (Comiso 2003). Summer Warmth Index (SWI) is the sum of monthly mean temperatures above 0 degrees Celsius. The months of May-September were evaluated for the years 1982 - 2003 (Raynolds et al. 2008). Back to <a href="/catalog/entries/5503-circumpolar-arctic-vegetation-map-cavm-team-2003">Circumpolar Arctic Vegetation...
Complete
2018-10-09 19:22:05 -0800
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