|Dataset||Variable (units)||Display parameters||Source(s) and references|
|Climate||Annual mean temperature (°C)||On a spectrum from blue (low) to red (high), using a minimum-maximum stretch.|| All datasets from the WorldClim database of 30 arc-second resolution global maps (Hijmans et al. 2005).|
These data are available from http://www.worldclim.org/current
|Annual mean rainfall values (mm)||From blue (low) to green (high), using a minimum-maximum stretch.|
|Rainfall seasonality (the coefficient of variation on annual rainfall; in arbitrary units from 0-300)||From blue (low) to red (high) using a minimum-maximum stretch.|
|Temperature seasonality (the standard deviation of annual temperature x 100; in arbitrary units from 0-225,000)||From blue (low) to red (high) using a minimum-maximum stretch.|
|Vegetation/ecology||Vegetation structure map (classifying into 'open', 'semi-open', 'closed', 'aquatic', 'anthropogenic' and 'arid/semi-arid' categories)||Different colours indicate different vegetation types. Closed vegetation = dark green; semi-open = light green; open = yellow; aquatic = blue; anthropogenic = grey and arid/semi-arid = beige.||This dataset comes from the physiognomic layer of the Useful Tree Species for Africa tool, based on White (1983)'s Vegetation Map of Africa at 1:5,000,000 scale.|
The data are available from http://www.worldagroforestrycentre.org/our_products/databases/useful-tree-species-africa
|WWF ecoregions map (an 'ecoregion' is a characteristic, geographically and ecologically defined assemblage of communities and species). This map combines data on vegetation, species richness and endemism||Different colours indicate different ecoregions.||This layer is drawn from the WWF 'Terrestrial Ecoregions of the World' data (Olson et al. 2001).
The data are available from http://www.worldwildlife.org/publications/terrestrial-ecoregions-of-the-world
|Landscape (terrain and spatial patterning)||Altitude (metres above sea level)||From blue (low) to red (high), using a standard deviations x2 stretch.||These data come from the SRTM 90m Digital Elevation Database v4.1 (Jarvis et al. 2008). Resampled 250m resolution data were used throughout.|
Roughness maps were derived from topographic ones as described in the method section.
SRTM4.1 data is available from http://www.cgiar-csi.org/data/srtm-90m-digital-elevation-database-v4-1
|Terrain roughness – a measure of the variability in slope orientations (arbitrary units from 0 to ~8)||From blue (low) to red (high) using a standard deviations x2 stretch.|
|Surficial geology||Different colours indicate different geological units.||This layer draws on the 'Surficial geology of Africa' dataset (USGS 2000).
The data are available from http://certmapper.cr.usgs.gov/data/we/ofr97470a/spatial/export/geo7_2age.zip
|Surficial soil types||Different colours indicate different soil types. These maps were used only at larger (continental and regional) scales because they were of relatively lower resolution.||This layer comes from the Harmonized World Soil Database (FAO/IIASA/ISS-CAS/JRC 2009).|
The data are available from http://webarchive.iiasa.ac.at/Research/LUC/External-World-soil-database/HTML/HWSD_Data.html?sb=4
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File last updated: Wed Mar 4 2015