Global Tree Density (Global tree density map)
type: Dataset
comment: This dataset metadata was generated with the use of AI and reviewed by an expert. If you see any mistakes please file an issue on GitHub at https://github.com/earthcube/communityCollections/issues.
description: 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.
creator: T. W. Crowther
  type: Person
  affiliation: Yale University
creator: H. B. Glick
  type: Person
  affiliation: Yale University
creator: K. R. Covey
  type: Person
  affiliation: Yale University
creator: G. Amatulli
  type: Person
  affiliation: Yale University
creator: M.-N. Tuanmu
  type: Person
  affiliation: Yale University
creator: W. Jetz
  type: Person
  affiliation: Yale University
publisher: EliScholar (Yale School of the Environment)
  type: Organization
  parent organization: Yale University
date published: 2015-09-02
keywords: tree density
keywords: forest
keywords: global map
keywords: biome
keywords: ecoregion
keywords: biodiversity
keywords: conservation
keywords: GIS
keywords: ArcGIS
keywords: GeoTIFF
keywords: spatial modeling
variable measured: Tree density (biome-level model)
  type: PropertyValue
  description: Biome-level regression model predictions applied at biome scale.
  temporal coverage: 2015-09-02
  spatial coverage: Global
    type: Place
    geo: GeoShape
      box: -180,-90 180,90
  temporal resolution: not detected
  spatial resolution: Best suited for country-scale (or larger) summaries; pixel-level precision is less reliable per creators' guidance.
variable measured: Tree density (ecoregion-level model)
  type: PropertyValue
  description: Ecoregion-level regression model predictions applied at ecoregion scale.
  temporal coverage: 2015-09-02
  spatial coverage: Global
    type: Place
    geo: GeoShape
      box: -180,-90 180,90
  temporal resolution: not detected
  spatial resolution: Best suited for country-scale (or larger) summaries; pixel-level precision is less reliable per creators' guidance.
measurement technique: Compilation of >420,000 ground-sourced tree density estimates
measurement technique: Linear regression modeling using vegetative, climatic, topographic, and anthropogenic predictors
measurement technique: Modeling in R; mapping in R and ArcGIS 10.1
funding: Yale Climate and Energy Institute
funding: British Ecological Society
license: https://creativecommons.org/licenses/by-nd/4.0/
encoding format: application/zip
encoding format: application/x-esri-geodatabase
encoding format: image/tiff
encoding format: application=geotiff
version: 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.
distribution: Primary download (ZIP; ArcGIS File Geodatabase + supporting ArcGIS files)
  type: DataDownload
  description: 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).
  encoding format: application/zip
distribution: Revision 01 (small islands) ZIP
  type: DataDownload
  description: Revision_01 adds tree density predictions for small islands not included in the primary download; follows the original file structure.
  encoding format: application/zip
distribution: Revision 01 WGS84 GeoTIFF ZIP
  type: DataDownload
  description: 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.
  encoding format: application/zip
citation: Mapping tree density at a global scale
  type: ScholarlyArticle
  author: T. W. Crowther
  author: H. B. Glick
  author: K. R. Covey
  author: et al.
  is part of: Nature
  date published: 2015-09-10
about: Tree density
about: Forests
about: Land cover
about: Biodiversity
about: Global environmental mapping

PropertyValue
property ID: doi
value: 10.1038/nature14967