MODIS tree cover change of North American boreal forests 2000-2019



The published files are two maps of North American boreal forest tree cover trends between 2000 and 2019. Pixel values are annual trends in tree cover expressed as % change per year. The trends are based on annual tree cover estimates from the MODIS Vegetation Continuous Field version 6 product. We quantified tree cover trends per pixel through Theil-Sen's slope estimation using the 'zyp' package in R. We followed the Yue-Pilon pre-whitening method to account for temporal autocorrelation. We created a trend map for all data points within the boreal biome boundary following Gauthier et al. 2015, Science (DOI: 10.1126/science.aaa9092) and added a 120km buffer around it (tcchange_all_points_clipped.tif). We also produced a map where we masked out non-significant trends based on a Mann-Kendall-test (tcchange_significant_points.tif). Both maps have a spatial resolution of around 1,000m. The map forms the key results in our manuscript: 'Tree cover changes reveal contraction of North American boreal forests', Rotbarth et al. (In Review)
Date made available10 Jan 2023
PublisherWageningen University & Research
Temporal coverage2000 - 2019
Geographical coverageNorth America


  • boreal forests
  • trend map
  • North America
  • tree cover

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