Previews

Aga circumpolar avhrr cir 1995

Circumpolar Arctic AVHRR False Color-Infrared (CIR) Map

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 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. Maximum greenness was determined from the normalized difference vegetation index (NDVI). Vegetation greenness is calculated as: NDVI = (NIR - R) / (NIR + R), where NIR is the spectral reflectance in the AVHRR near-infrared channel (0.725-1.1 µ, channel 2) where light-reflectance from the plant canopy is dominant, and R is the reflectance in the red channel (0.58 to 0.68 µ, channel 1), the portion of the spectrum where chlorophyll absorbs maximally. The resulting image shows the Arctic with minimum snow and cloud cover. The channel 1 and channel 2 values were then stacked to create as a false-color CIR image (RGB = ch. 2, ch. 1, ch. 1).

Back to Circumpolar Arctic 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.

Complete

Data and Resources

  • Download

    Download :: Publication

    Walker_2002_IJRS_CAVM.pdf (1.69 MB)

  • Download

    Download :: GIS Data

    aga_circumpolar_avhrr_cir_1995_tif.zip (92.7 MB)

  • View website

    Website :: Toolik Arctic Geobotanical Atlas

    http://www.arcticatlas.org/maps/themes/cp/cpavh

Status: Complete
Type: Data
Data Types: GIS, Image, Report, Map
Primary Contacts
Name: Donald A. (Skip) Walker
Email: dawalker@alaska.edu
Other Contacts
Name: Martha Raynolds
Email: mkraynolds@alaska.edu
Regions
Arctic

Collections
All Maps
Circumpolar Arctic Vegetation Map

Direct Record Link
http://alaskaaga.gina.alaska.edu/catalog/entries/5520-circumpolar-arctic-avhrr-false-color-infrared