ABoVE: NDVI Trends across Alaska and Canada from Landsat, 1984-2012

Description

This dataset provides the summer NDVI trend and trend significance for the period 1984-2012 over Alaska and Canada. The NDVI were calculated per-pixel from all available peak-summer 30-m Landsat 5 and 7 surface reflectance data for the period. NDVI time series were assembled for each 30-m land location (i.e., non-water, non-snow), from observations that were unaffected by clouds as indicated by data-quality masks and following additional processing to remove anomalous NDVI values. A simple linear regression via ordinary least squares was applied to the per-pixel NDVI time series. The slope of the regression was taken as the annual NDVI trend (unit NDVI change per year) and is reported in the "trend" data files. A Student's t-test was used to assess the significance of the trend and the per-pixel significance is reported in the "trend_sig" data files. A significant positive slope indicates a greening trend, and a significant negative slope indicates a browning trend.

Resources

Name Format Description Link
21 Data set Landing Page DOI URL https://doi.org/10.3334/ORNLDAAC/1576
21 ABoVE project site https://above.nasa.gov
33 ABoVE: Vegetation Greenness Trend from Landsat Imagery, Alaska and Canada, 1984-2012: Vegetation_greenness_trend.pdf https://data.ornldaac.earthdata.nasa.gov/public/above/Vegetation_greenness_trend/comp/Vegetation_greenness_trend.pdf
34 Figure 1: NDVI trends derived from 30-m Landsat NDVI times series for 1984-2012 for Canada and Alaska (Ju and Masek, 2016). https://daac.ornl.gov/ABOVE/guides/Vegetation_greenness_trend_Fig1.png
21 This link allows direct data access via Earthdata login https://daac.ornl.gov/above/Vegetation_greenness_trend/
21 ORNL DAAC Data Set Documentation https://daac.ornl.gov/ABOVE/guides/Vegetation_greenness_trend.html
21 Search results for publications that cite this dataset by its DOI. https://scholar.google.com/scholar?q=10.3334%2FORNLDAAC%2F1576

Tags

  • biosphere
  • vegetation
  • earth-science

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