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For any form of publication, please include the link to this page and give the cartographer/designer credit (in this case Riccardo Pravettoni, UNEP/GRID-Arendal)
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Sumatran orangutan distribution shapefile prepared by Singleton and Wich and based on Wich et al. 2008 with unpublished data added.
Shapefile for lakes digitized by PanEco/YEL from Landsat mosaics (see above overview).
Rainfall layer adapted from Grid (1km) of Average Annual Rainfall (Zone29) downloaded from the WorldClim website (http://www.worldclim.org).
Uploaded on Wednesday 01 Feb 2012
Riccardo Pravettoni, UNEP/GRID-Arendal
Sumatran orangutans live in lowland tropical rainforests, with precipitation normally between 1,680 mm and 4,070 mm annually. Western regions receive much more rain than those in the east, as prevailing winds from the Indonesian ocean are forced upwards, cooling rapidly and condensing water vapour, which then falls as precipitation.