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24 results found Displaying entries 1 - 20 of 24 in total

Alaska Arctic AVHRR NDVI Map

Aga arctic ak 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
2019-08-26 13:59:23 -0800
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Alaska Arctic Floristic Provinces Map

Aga arctic ak floristic 2005 Alaska Geobotany Center (AGC) - 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
2019-08-19 13:57:32 -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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AVA-AK: Atqasuk Vegetation Plots (Komárková & Webber 1980; Villarreal 2013)

Aava atqasuk 1980 sitephoto Alaska Geobotany Center (AGC), Systems Ecology Lab, University of Texas El Paso (SEL at UTEP) - Arctic Vegetation Archive - Alaska: Atqasuk. The Atqasuk vegetation plots were originally described and mapped by Drs. Vera Komárková and Patrick J. Webber in 1975 as part of the Research on Arctic Tundra Environments (RATE) project. These sites were resampled in 2000 and 2010 and assessed for community change as part of the 'IPY Back to the Future: Resampling old research sites to assess...
Complete
1975-07-01
2010-07-01
2019-09-27 16:38:00 -0800
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AVA-AK: Cape Thompson Vegetation Plots (Johnson et al. 1966)

Aava capethompson fromvierecketal image Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Cape Thompson Vegetation Plots. The vegetation of the Cape Thompson region at Ogotoruk Creek was described by A. W. Johnson et al. during the U.S. Atomic Energy Commission’s Project Chariot Studies from 1959-1963 funded under Contract No. AT (04-3)-310. Cape Thompson is on the Chukchi Sea on the Lisburne Peninsula in the Arctic Foothills of the Brooks...
Complete
1959-01-01
1980-12-31
2019-09-27 16:51:34 -0800
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AVA-AK: Imnavait Creek Vegetation Plots (Walker et al. 1987a)

Aava imnavaitcreek dwalker 1987a a sitephoto metadata Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Imnavait Creek Vegetation Plots. Vegetation in the vicinity of the Imnavait Creek field site located in the Upper Kuparuk watershed of the Brooks Range was described by D.A. Walker et al. as part of a study that was initiated in the summer of a Department of Energy R4D (Response, Resistance, Resilience and Recovery from Disturbance) project. Imnavait Creek...
Complete
1984-08-01
1985-09-04
2019-09-30 13:32:35 -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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AVA-AK: Arctic Network (Jorgenson et al. 2009)

Aava arcticnetworknps tjorgenson 2009 plotmap Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Arctic Network. Vegetation sampling for an ecological land survey classification and landcover map was completed for the over 19.5 million acres encompassed by the Bering Land Bridge National Preserve, Cape Krusenstern National Monument, Gates of the Arctic National Park and Preserve, Kobuk Valley National Park and Noatak National Preserve. The study was...
Complete
2002-07-10
2008-08-10
2019-09-27 16:33:25 -0800
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Alaska Arctic Lake Cover Map

Aga arctic ak lake cover 2005 1 Alaska Geobotany Center (AGC) - 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
2019-08-15 13:14:09 -0800
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AVA-AK: Frost Boil Vegetation Plots (Kade et al. 2005)

Aava frostboils akade 2005 locationmap anc Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Frost Boil Vegetation Plots. The vegetation associated with cryoturbated frost-heave features on the North Slope, Alaska was described by Kade et al. (2005) as part of the "Biocomplexity associated with biogeochemical cycles in arctic frost-boil ecosystems" project (National Science Foundation grant OPP-0120736) from 2002 to 2006. The study sites spanned...
Complete
2000-08-16
2003-08-09
2019-09-27 17:01:28 -0800
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AVA-CA: High Arctic Canada, Isachsen, Ellef Ringnes Is. Vegetation Plots (Vonlanthen et al. 2008)

Aava hacisachsen cvonlanthen 2008 plotmap anc Alaska Geobotany Center (AGC) - Arctic Vegetation Archive-Canada: High Arctic Canada, Isachsen, Ellef Ringnes Island Vegetation Plots. The vegetation of 52 plots at Isachsen (the now closed High Arctic Weather Station) on Ellef Ringnes Island, Canada was studied as part of a multi-year project focused on patterned-ground plant communities. Patterned ground includes circles, polygons, nets, hummocks, and other features...
Complete
2005-07-22
2005-07-29
2019-09-27 17:14:43 -0800
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Prudhoe Bay Cumulative Impact Map B: Raynolds 2014

Aga prudhoe b change 2010 Alaska Geobotany Center (AGC) - Map B of the historical infrastructure changes for the Prudhoe Bay Oilfield for 10 dates from the initial oil discovery in 1968–2011. Aerial photos taken in 1949 and 1968 were used to define the geobotanical characteristics prior to development. Infrastructure changes were digitized from each successive analysis year (1970, 1972, 1973, 1977, 1979, 1983, 1990, 2001, and 2010). Polygon fields...
Complete
2019-08-20 14:46:40 -0800
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Alaska Arctic Tundra Vegetation Map (Raynolds et al. 2006)

Akfront Alaska Geobotany Center (AGC) - The Alaska Arctic Tundra Vegetation Map (AATVM) is a geoecological map of the Arctic Tundra within Alaska. It includes areas north and west of the forest boundary and excludes areas that have a boreal flora such as the Aleutian Islands and alpine tundra regions south of treeline. The map expands on the Alaska portion of the [Circumpolar Arctic Vegetation...
Complete
2019-08-16 12:42:33 -0800
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Alaska Arctic Vegetation Map

Aga arctic ak vegetation 2005 Alaska Geobotany Center (AGC) - 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
2019-08-19 13:59:19 -0800
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AVA-AK: ATLAS-1 (Atqasuk, Barrow, Ivotuk, Oumalik) Vegetation Studies (Edwards et al. 2000)

Aava atlas1 dwalker 2000 plotmap anc Alaska Geobotany Center (AGC) - Arctic Vegetation Archive-Alaska: ATLAS-1. Vegetation from 15 releves within 8 different grids at Barrow, Atqasuk, Ivotuk and Oumalik were described as part of the NSF-funded Arctic Transition in Land-Atmosphere System (ATLAS) project. The full ATLAS Transect also includes locations at Council and Quartz Creek, which are in the ATLAS-2 dataset (Raynolds et al. 2002). The focus of the ATLAS...
Complete
1998-01-01
2000-06-22
2019-09-27 16:35:38 -0800
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AVA-AK: ATLAS-2 (Raynolds et al. 2002)

Aava atlas2 mraynolds 2000 plotmap anc Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: ATLAS-2. The ATLAS-2 dataset is part of larger NSF-funded Arctic Transition in Land-Atmosphere System (ATLAS) project. ATLAS-2 contains the Seward Peninsula portion of the project with 52 plots at Council and Quartz Creek. The full ATLAS Transect also includes 15 releves at locations on the North Slope at Barrow, Atkasuk, Oumalik, and Ivotuk which are in...
Complete
2000-07-11
2000-07-29
2019-09-30 13:29:56 -0800
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AVA-CA: High Arctic Canada, Mould Bay, Prince Patrick Is. Vegetation Plots (Vonlanthen et al. 2008)

Aava hacmldbay cvonlanthen 2008 plotmap anc Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Canada: High Arctic Canada, Mould Bay, Prince Patrick Island Vegetation Plots. The vegetation at Mould Bay on Prince Patrick Island, Canada was studied as part of a multi-year project focused on patterned-ground plant communities. Patterned ground includes circles, polygons, nets, hummocks, and other features caused by differential freezing processes in soils....
Complete
2004-07-18
2004-07-24
2019-09-27 17:17:20 -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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AVA-AK: Nome (Hanson 1953)

Nome%20%28nome hh%29 Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Nome. 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...
Complete
1951-07-30
1951-08-02
2019-09-30 13:43:28 -0800
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AVA-AK: Legacy Vegetation Studies (Elias et al. 1996)

Aava legacy dwalker 1996 barterislplotmap anc Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Legacy Vegetation Studies. The Legacy Resource Management Program (Department of Defense, Legacy Project Number 0742) was part of a larger study initiated in 1991 by the United States Congress to provide an opportunity to enhance the stewardship of the natural and cultural resources on the more than 25 million acres of land under Department of Defense...
Complete
1994-08-01
1994-08-11
2019-09-30 13:40:38 -0800
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