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18 results found Displaying all 18 entries

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 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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Current Turboveg Data Dictionary and Panarctic Species List (PASL)

Alaska Geobotany Center (AGC) - These are the most recent Data Dictionary (pop-ups) and Panarctic Species List (PASL) zip files for all the vegetation plot data entered into Turboveg for the Alaska AVA. These files are necessary to correctly use the Turboveg data with regards to coded data. The Data Dictionary file will be updated when new datasets are entered into Turboveg which result in additions to coded data such as...
Ongoing
2015-06-24
2019-08-15 13:05:13 -0800
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AVA-AK: Arrigetch Peaks (Cooper 1983)

Aava arrigetchpeask dcooper 1983 sitephoto metadata Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Arrigetch Peaks. The vegetation of Arrigetch Peaks was described and mapped by David J. Cooper for his PhD thesis funded by National Park Service. Located in the Endicott Mountains of the central Brooks Range, the vegetation of the Arrigetch Peaks is uniquely influenced by both latitude and altitude (Cooper 1986b). A reconnaissance of the area was...
Complete
1976-01-01
1983-12-31
2019-09-30 13:29:23 -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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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-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-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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AVA-AK: North Slope ARCSS/LAII Flux Study (Walker 1995-1996 unpublished data)

Aava nsflux dwalker 1995 plotmap anc Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: North Slope ARCSS/LAII Flux Study. The vegetation and soils at the North Slope Arctic System Science/Land-Atmosphere-Ice Interactions ARCSS/LAII Flux tower sites of F. S. Chapin and W. Oechel on the North Slope of Alaska were described by D. A. Walker, J. Bockheim, and C. L. Ping in 1995 and 1996. The primary source documents for this dataset are a...
Complete
1995-08-15
1996-08-18
2019-09-30 13:46:08 -0800
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AVA-AK: Barrow DOE NGEE-Arctic (Sloan et al. 2014)

Barrow%20doe%20ngee%20%28brw vs%29%20pic%20by%20rich%20norby Alaska Geobotany Center (AGC) - Arctic Vegetation Archive - Alaska: Barrow DOE NGEE-Arctic. As part of a larger study to understand the structure and function of Arctic terrestrial ecosystems response to climate change, 48 vegetation study plots were established at the Barrow Environmental Observatory, NGEE Intensive Sampling Site 1, Areas A-D. Species cover and plot specific environmental data were recorded in 2012....
Complete
2012-07-17
2012-07-21
2019-09-27 16:42:42 -0800
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