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
5 https://search.earthdata.nasa.gov%2Fsearch%3Fq%3DVegetation_greenness_trend_1576%26ac%3Dtrue
5 https://daac.ornl.gov%2FABOVE%2Fguides%2FVegetation_greenness_trend.html
5 https://doi.org%2F10.3334%2FORNLDAAC%2F1576
5 https://daac.ornl.gov%2FABOVE%2Fguides%2FVegetation_greenness_trend_Fig1.png
5 https://above.nasa.gov%2F
5 https://data.ornldaac.earthdata.nasa.gov%2Fpublic%2Fabove%2FVegetation_greenness_trend%2Fcomp%2FVegetation_greenness_trend.pdf
5 https://search.earthdata.nasa.gov/search?q=Vegetation_greenness_trend_1576&ac=true
21 https://doi.org/10.3334/ORNLDAAC/1576
34 Vegetation_greenness_trend_Fig1.png https://daac.ornl.gov/ABOVE/guides/Vegetation_greenness_trend_Fig1.png
5 https://above.nasa.gov/
33 Vegetation_greenness_trend.pdf https://data.ornldaac.earthdata.nasa.gov/public/above/Vegetation_greenness_trend/comp/Vegetation_greenness_trend.pdf

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  • earth-science-vegetation-biosphere-vegetation-index-normalized-difference-vegetation-index-ndvi

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