Record Previews

Arctic Alaska AVHRR NDVI Map

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 chlorophyll absorbs maximally. Advanced Very High Resolution Radiometer (AVHRR) data were obtained from theUSGS Global AVHRR 10-day composite data (http://edcdaac.usgs.gov/1KM/1kmhomepage.asp). 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 time of maximum greenness, selected from 10-day composite images from 11 July to 30 August 1993 and 1995. These intervals cover the vegetation green-up-to-senescence period during two relatively warm years when summer-snow cover was at a minimum in the Arctic (Markon et al. 1995).

Back to Alaska Arctic Tundra Vegetation Map

References

Markon, C. J., M. D. Fleming, and E. F. Binnian. 1995. Characteristics of vegetation phenology over the Alaskan landscape using AVHRR time-series data. Polar Record 31:179-190.

Data and Resources

  • Download
    Download :: Map Image

    aga_arctic_ak_avhrr_ndvi_1995.jpg (2.46 MB)

  • Download
    Download :: GIS Data

    aga_arctic_ak_avhrr_ndvi_1995.tif.zip (835 KB)

  • View website
    Website :: Toolik Arctic Geobotanical Atlas

    http://www.arcticatlas.org/maps/themes/ak/akndph

Status: Complete
Type: Data
Data Types: Image, GIS, Map
Primary Contact
Raynolds, Martha
ISO Topics
geoscientificInformation, imageryBaseMapsEarthCover

Geo-keywords
Alaska, Arctic

Collection
Alaska Arctic Tundra Vegetation Map, All Maps

Direct Record Link
http://alaskaaga.gina.alaska.edu/catalogs/9772-arctic-alaska-avhrr-ndvi-map
  • 07969bba1ee875e70c44c0423525d17f
    Updated by Jana
    2016-02-17 18:44:57 -0900
  • 07969bba1ee875e70c44c0423525d17f
    Updated by Jana
    2015-10-12 14:27:52 -0800
  • 07969bba1ee875e70c44c0423525d17f
    Updated by Jana
    2015-10-12 14:27:19 -0800
  • 07969bba1ee875e70c44c0423525d17f
    Updated by Jana
    2015-10-07 18:32:59 -0800
  • 01c8ceef3d596f40f05bf496ca00d929
    Updated by Lisa
    2015-04-13 14:56:58 -0800
  • 01c8ceef3d596f40f05bf496ca00d929
    Published by Lisa
    2015-04-01 14:15:37 -0800
  • 01c8ceef3d596f40f05bf496ca00d929
    New record created
    2015-04-01 14:15:30 -0800
Top