Global Drought Hazard

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  • This dataset updates: Never
Additional information
Time Period of the Dataset [?]
January 01, 1902-December 31, 2018 ... More
Modified [?]
16 January 2023
Dataset Added on HDX [?]
16 January 2023 Less
Expected Update Frequency
Never
Location
Source
Institute for International Law of Peace and Armed Conflict
Methodology

The Global Drought Hazard project is a collection of spatial raster datasets that provide access to statistical extreme value analyses of the Standardised Precipitation Evapotranspiration Index (6-month SPEI) to identify high risk areas on a global scale.

The source data are monthly spatial raster datasets from the Climatology and Climate Services Laboratory's Global SPEI Database for the period from January 1902 to December 2018. Each raster dataset has a spatial resolution of about 0.5 degrees, the values of which we converted into time series for each grid cell. These time series are used to model the number of months above selected SPEI thresholds (e.g. SPEI -1.5 or lower) for a range of return periods (e.g. 100 years) via Poisson-Generalized Pareto Point Process models.

Since extreme value analyses are highly influenced by non-stationarity and time dependence of the data, time-varying parameters to deal with non-stationarity, declustering to reduce tail dependence, and spatiotemporally weighted error term corrections were incorporated into the modelling process for each cell. The modelling results for each return period are projected bilinearly onto a spatial grid with a higher resolution of about 0.0083 degrees for publication.

Caveats / Comments

This project is based on analyses of other spatial datasets and should not be used for local or regional applications. Its purpose is to identify areas of high drought risk and highlight regions where more and more accurate research data should be. Due to the generalized statistical approach of the analysis, some areas may be under- or overestimated.

Suggested citation: Weller, Daniel & Mann, Holger (2022): Global Drought Hazard. A global raster data set of extreme value analyses of the Standardized Precipitation Evapotranspiration Index via Poisson-Generalized Pareto Point Process modelling. Distributed by The Humanitarian Data Exchange: Institute for International Law of Peace and Armed Conflict.

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Public
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