ReefGIS :: Dataset Definitions
Reefs At Risk
Reefs At Risk Revisited
Global (2011)
Low Threat
Medium Threat
High Threat
Very High Threat
Critical
"Reefs at Risk Revisited," the most detailed assessment of threats to coral reefs ever undertaken, is being released by the World Resources Institute, along with the Nature Conservancy, the WorldFish Center, the International Coral Reef Action Network, Global Coral Reef Monitoring Network, and the UNEP-World Conservation Monitoring Center, along with a network of more than 25 organizations. Launch activities are taking place in Washington, D.C., London, Malaysia, Indonesia, the Caribbean, Australia, and other locations around the world.
Reefs At Risk
Southeast Asia (2002)
Low Threat
Medium Threat
High Threat
Reefs at Risk in Southeast Asia provides a detailed analysis of potential threats of human activities to coral reefs across Southeast Asia. These indicators evaluate pressure from coastal development, marine-based pollution, pollution and sedimentation from inland sources, and overexploitation of coral resources. Shown here are all individual threat layers, the overall threat indicator based on those layers, and maps showing coral reefs "classified" by the individual threats as well as the overall threat. For more information on the Reefs At Risk project, please click here.
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Caribbean (2004)
Low Threat
Medium Threat
High Threat
Very High Threat
Reefs at Risk in the Caribbean provides a detailed analysis of potential threats of human activities to coral reefs across the Caribbean. These indicators evaluate pressure from coastal development, marine-based pollution, pollution and sedimentation from inland/watershed sources, and overfishing. Shown here are all individual threat layers, the overall threat indicator based on those layers, and maps showing coral reefs "classified" by the individual threats as well as the overall threat. For more information on the Reefs At Risk project, please click here.
Download this dataset


The assessment is based on the four separate threat factors: coastal development, marine-based pollution, overexploitation of marine resources and inland pollution, including sedimentation.

Reefs classified as under low threat in all four threat factors were classified as under low threat overall
Reefs classified as under medium threat in at least one threat factor were classified as under medium threat overall
Reefs classified as under high threat in at least one of the individual threat factors were classified as under high threat overall / three of the individual threats were rated as medium threat overall
Reefs classified as under very high threat in at least three of the individual threats were rated as high threat overall

Physical Features
Place Names
Place Names A list of reef-relevant place names was compiled by ReefBase. This list inlcludes: cities, towns, bays, straits, coral reefs, dive sites and other types of locations, and was compiled using a variety of sources.
Countries
Countries The country data layer originally comes from the Vector Map (VMap) Level 0, by the National Imagery and Mapping Agency (NIMA). Vector Map (VMap) Level 0 is an updated and improved version of the Digital Chart of the World (DCW®). The VMap Level 0 database provides worldwide coverage of vector-based geospatial data at 1:1,000,000 scale.
Topography
Topography Land topography data originates from the The Global Land One-kilometer Base Elevation (NOAA, NGDC: GLOBE) digital elevation model. It provides 30 arc second gridded elevation data at 1 km resolution. In ReefBase GIS, the topography-layer (as well as bathymetry) is turned off by default to improve performance. If you want to produce more visually attractive maps, you should click the "Show/Hide Topography" button in the map. For full metadata on GLOBE, please click here.
Bathymetry
The bathymetry (ocean depth) data originates from National Geophysical Data Center TerrainBase Global DTM Version 1.0. This data represent an estimate of depth for each 5-minute cell (~10km horizontal resolution). In ReefBase GIS, the bathymetry-layer (as well as topography) is turned off by default to improve performance. If you want to produce more visually attractive maps, you should click the "Show/Hide Topography" button in the map. For full details on TerrainBase, please click here.