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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...
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2019-08-15 13:35:35 -0800
9trmurq3zu agc logo 144
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Circumpolar Arctic Biomass (Raynolds et al 2012)

Aga circumpolar avhrr biomass 2010 Alaska Geobotany Center (AGC) - This map portrays an estimate of above ground plant biomass for the tundra biome based on trans-Arctic field data and AVHRR NDVI (Raynolds et al. 2012). Aboveground phytomass was sampled on transects along the Arctic bioclimate gradient in North America (1750 km long, 8 locations sampled 2003–2006) and Eurasia (1500 km, 5 locations sampled 2007–2010). The study locations were chosen to...
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2019-08-15 13:30:05 -0800
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Upper Kuparuk River Region SPOT NDVI

Aga upper kuparuk spot ndvi 1985 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. NDVI is an index of vegetation greenness that can be linked to plant biomass and other biophysical properties of the vegetation, such as CO2 and photosynthesis. The NDVI = (NIR - R)/(NIR + R), where NIR and R are the spectral reflectance values of the near-infrared...
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2019-08-19 14:14:04 -0800
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Circumpolar Arctic Biomass Trend 1982-2010 (Epstein et al. 2012)

Aga circumpolar avhrr biomass trend 1982 2010 Alaska Geobotany Center (AGC) - Trend in Arctic biomass was calculated from a linear regression of biomass values for all years 1982-2010 (Epstein et al 2012). Pixels with significant trends (p < 0.05) were retained. Biomass was calculated from the relationship between AVHRR NDVI and ground sampling of biomass, as described below: Aboveground phytomass was sampled on transects along the Arctic bioclimate gradient in North...
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2019-08-15 13:31:21 -0800
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