Woody and Herbaceous Vegetation Change across the Savannas of West Africa, 1982-2013

Description

The WAVeTrends dataset is a 0.05 degree (5.55 km) vegetation change product, spanning the West African Sudano-Sahel region. It provides pixel-wise information on concurrent woody and herbaceous vegetation trends over a 32-year period (1982-2013). Change in woody vegetation was derived using long-term rain use efficiency (RUE) sensitivity, i.e., the per-pixel comparison of the difference of mean RUE between the first and last decades of the 32-year time series. Herbaceous vegetation change was defined by short-term RUE sensitivity, i.e., comparing the slope of the RUE relationship (productivity vs. precipitation) between both decades using per-pixel Analysis of Covariance (ANCOVA). Categorical vegetation change was then determined for each pixel using the direction of the change and a significance level of p<0.05. The use of RUE (the amount of biomass produced per unit of precipitation) for vegetation trend analysis in savanna regions relies on the assumption that rainfall is a significant positive driver of net production in drylands. Testing of this long-term productivity-rainfall relationship revealed that the assumption was not always met, therefore, validity flags are included for each pixel location.

Resources

Name Format Description Link
33 WAVeTrends.pdf https://data.ornldaac.earthdata.nasa.gov/public/global_vegetation/WAVeTrends/comp/WAVeTrends.pdf
5 https://search.earthdata.nasa.gov%2Fsearch%3Fq%3DWAVeTrends_1738%26ac%3Dtrue
5 https://daac.ornl.gov%2FVEGETATION%2Fguides%2FWAVeTrends.html
5 https://doi.org%2F10.3334%2FORNLDAAC%2F1738
5 https://data.ornldaac.earthdata.nasa.gov%2Fprotected%2Fbundle%2FWAVeTrends_1738.zip
5 https://daac.ornl.gov%2FVEGETATION%2Fguides%2FWAVeTrends_Fig1.png
5 https://data.ornldaac.earthdata.nasa.gov%2Fpublic%2Fglobal_vegetation%2FWAVeTrends%2Fcomp%2FWAVeTrends_classify.pdf
5 https://data.ornldaac.earthdata.nasa.gov%2Fpublic%2Fglobal_vegetation%2FWAVeTrends%2Fcomp%2FWAVeTrends.pdf
5 https://search.earthdata.nasa.gov/search?q=WAVeTrends_1738&ac=true
21 https://doi.org/10.3334/ORNLDAAC/1738
57 WAVeTrends_1738.zip https://data.ornldaac.earthdata.nasa.gov/protected/bundle/WAVeTrends_1738.zip
34 WAVeTrends_Fig1.png https://daac.ornl.gov/VEGETATION/guides/WAVeTrends_Fig1.png
33 WAVeTrends_classify.pdf https://data.ornldaac.earthdata.nasa.gov/public/global_vegetation/WAVeTrends/comp/WAVeTrends_classify.pdf
5 https://search.earthdata.nasa.gov/search?q=WAVeTrends_1738&ac=true
21 https://doi.org/10.3334/ORNLDAAC/1738
57 WAVeTrends_1738.zip https://data.ornldaac.earthdata.nasa.gov/protected/bundle/WAVeTrends_1738.zip
34 WAVeTrends_Fig1.png https://daac.ornl.gov/VEGETATION/guides/WAVeTrends_Fig1.png
33 WAVeTrends_classify.pdf https://data.ornldaac.earthdata.nasa.gov/public/global_vegetation/WAVeTrends/comp/WAVeTrends_classify.pdf
33 WAVeTrends.pdf https://data.ornldaac.earthdata.nasa.gov/public/global_vegetation/WAVeTrends/comp/WAVeTrends.pdf
0 The metadata's original source. https://cmr.earthdata.nasa.gov/search/concepts/C2764722720-ORNL_CLOUD.iso19115

Tags

  • earth-science-precipitation-atmosphere-liquid-precipitation-rain
  • earth-science-ecological-dynamics-biosphere-ecosystem-functions-primary-production
  • earth-science-vegetation-biosphere-vegetation-cover
  • earth-science-habitat-conversion-fragmentation-human-dimensions-reforestation-revegetation
  • earth-science-ecosystems-biosphere-terrestrial-ecosystems-savannas
  • earth-science-vegetation-biosphere-vegetation-index-normalized-difference-vegetation-index-ndvi

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