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Hillshade generated from SRTM 90m DEM available from the CGIAR website (http://srtm.csi.cgiar.org/).
Bathymetry from the ETOPO1 Global Relief Model downloaded from: http://www.ngdc.noaa.gov/mgg/global/global.html
Sumatran orangutan distribution shapefile prepared by Singleton and Wich and based on Wich et al. 2008 with unpublished data added.
Aquifer productivity digitzed from Sheet I and part of sheet II of the 1:1,000,000 Hydrogeological map of Indonesia published in 2004 by the Directorate of Geological and Mining Area Environment.
Uploaded on Wednesday 01 Feb 2012
Riccardo Pravettoni, UNEP/GRID-Arendal
Most of the Sumatran orangutan's forests inland play a key role in ensuring downstream freshwater supplies, since the non-alluvial inland areas of the region tend to have very little or no underlying groundwater resources.