Input layer sources

Ecosystems
Layer theme Dataset Title Provider Reference period Resolution URL
Forest WRI Current forest coverage World Resources Institute (WRI) Atlas of Forest Landscape Restoration Opportunities 2000-2009 0.008333 dd https://www.wri.org/applications/maps/flr-atlas/#
Mangroves WCMC Global Distribution of Mangroves USGS World Conservation Monitoring Center (WCMC) Ocean Data Viewer 1997-2000 0.00028 dd https://data.unep-wcmc.org/
Seagrasses WCMC Global Distribution of Seagrasses WCMC Ocean Data Viewer 1934-2011 0.0004 dd https://data.unep-wcmc.org/
Coral reefs WCMC Global Distribution of Coral Reefs WCMC Ocean Data Viewer 1954-2009 0.00028 dd https://data.unep-wcmc.org/

A 0.01-degree resolution raster of real area was generated for each of the four considered ecosystems using an equation that approximate Earth ellipsoid.

In the case of forest coverage, the initial WRI classification was grouped in three classes: woodland, open forest and closed forest. The final forest ecosystem percentage is based on the spatial sum of these three classes area.

The areas with a deforested status (“Potential forest lands that are currently non forest were assumed to be deforested”) were not included in these new classes.

Hazard exposure
Layer theme Dataset Title Provider Reference period Resolution URL
Landslides Frequency of landslides triggered by earthquakes GAR 2009, PREVIEW / Global Risk Data Platform Model 0.008333 dd https://preview.grid.unep.ch
Landslides Frequency of landslides triggered by precipitations GAR 2009, PREVIEW / Global Risk Data Platform Model 0.008333 dd https://preview.grid.unep.ch
Tropical cyclones Tropical cyclones frequency GAR 2013, PREVIEW / Global Risk Data Platform 1970-2011 0.017333 dd https://preview.grid.unep.ch
Tropical cyclones surges Tropical cyclones surge frequency GAR 2009, PREVIEW / Global Risk Data Platform 1975-2007 0.008333 dd https://preview.grid.unep.ch
Tsunamis Tsunami hazard (tun up) RP 500 years GAR 2015, PREVIEW / Global Risk Data Platform 500 years RP model 0.008333 dd https://preview.grid.unep.ch
River floods Flood hazard # years GAR 2015, PREVIEW / Global Risk Data Platform 25 to 1000 years RP model ~0.01 dd https://preview.grid.unep.ch

For each natural hazard, a 0.01-degree resolution raster was generated, illustrating hazard annual frequency weighted with portion of pixel potentially affected. Landslide hazard is separated in two categories: landslides triggered by earthquakes or rainfall. In our case, the final frequency raster is the sum of both hazard annual frequencies. The underlying hypothesis is that a pixel affected by an earthquake triggered landslide event could still be affected by a rainfall-triggered landslide event during the same year and somewhere else in the pixel.

In the case of cyclones, annual frequency raster is calculated using the Saffir-Simpson largest buffer of each event.

Physical exposure was calculated for each natural hazard multiplying the hazard frequency raster with the population raster. The flood hazard model has various return period layers, the final physical exposure is the sum of each single physical exposure.

Population
Layer theme Dataset Title Provider Reference period Resolution URL
Population density GHS Population grid Joint Research Center Data Catalogue 2015 1 km https://data.jrc.ec.europa.eu/dataset

 

This work has been conducted jointly by UNEP and UNEP GRID-Geneva with funds from the European Union.

   

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