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Global Tree Density (Global tree density map)
Global tree density at a global scale provided as two spatially continuous raster maps of tree density. One map was generated using biome-level linear regression models and applied at the biome scale; the second map was generated using ecoregion-level linear regression models and applied at the ecoregion scale. The models were built using over 420,000 ground-sourced estimates of tree density and predictor variables spanning vegetative, climatic, topographic, and anthropogenic factors. The creators note that transitions at biome/ecoregion boundaries may appear abrupt and that estimates are generally more robust at country scale (or larger) than at individual pixel scale. The primary distribution is a zipped ArcGIS File Geodatabase package containing both raster models plus supporting ArcGIS layer and map-document files; additional files include a revision adding predictions for small islands and a WGS84 GeoTIFF derivative for the revision.
EliScholar (Yale School of the Environment)
Biome-level regression model predictions applied at biome scale.
Best suited for country-scale (or larger) summaries; pixel-level precision is less reliable per creators' guidance.
Ecoregion-level regression model predictions applied at ecoregion scale.
Compilation of >420,000 ground-sourced tree density estimates
Linear regression modeling using vegetative, climatic, topographic, and anthropogenic predictors
Modeling in R; mapping in R and ArcGIS 10.1
2015-09-02 release; includes biome-level and ecoregion-level models; additional files provide Revision_01 (small islands) and a WGS84 GeoTIFF derivative for Revision_01.
Primary download (ZIP; ArcGIS File Geodatabase + supporting ArcGIS files)
Primary dataset package (zipped) containing an ArcGIS File Geodatabase (.gdb) with two rasters (biome-level and ecoregion-level), plus supporting ArcGIS layer files (.lyr) and a map document (.mxd).
Revision_01 adds tree density predictions for small islands not included in the primary download; follows the original file structure.
Revision_01 biome-level model stored in WGS84 GeoTIFF format (reprojected from Goode Homolosine using nearest-neighbor resampling); includes the primary .tif and visualization support files.