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SPEIbase v.2 [Dataset]

AuthorsBeguería, Santiago CSIC ORCID ; Vicente Serrano, Sergio M. CSIC ORCID
Drought Index
Standardized Precipitation-Evapotranspiration Index
Global Warming
Climate change
Climate data
Global data
Issue Date12-Apr-2012
CitationBeguería, Santiago ; Vicente Serrano, Sergio M.; 2012; SPEIbase v.2 [Dataset]; DIGITAL.CSIC.;
AbstractGlobal gridded dataset of the Standardised Precipitation-Evapotranspiration Index (SPEI) at time scales between 1 and 48 months. Spatial resolution of 0.5º lat/lon. Temporal coverage between January 1901 and December 2009. This is an update of a previous version of SPEIbase ( What’s new in version 2.0: 1) Data has been extended to the period 1901-2009 (it was 1901-2006 in v 1.0). 2) The FAO-56 Penman-Monteith's method has been used for computing PET instead of Thornthwaite. 3) Unbiased probability weighted moments (ub-pwm) method has been used for fitting the log-Logistic distribution, instead of the sub-optimal plotting-position pwm method used in version 1.0. 4) The whole world is put in one single netCDF file. For more details on the SPEI visit
DescriptionThe Global 0.5° gridded SPEI dataset is made available under the Open Database License. Any rights in individual contents of the database are licensed under the Database Contents License. Users of the dataset are free to share, create and adapt under the conditions of attribution and share-alike.
Use of the newest version is recommended. Older versions are still available to allow replicability.
The Global SPEI database, SPEIbase, offers long-time, robust information on the drought conditions at the global scale, with a 0.5 degrees spatial resolution and a monthly time resolution. It has a multi-scale character, providing SPEI time-scales between 1 and 48 months. The Standardized Precipitatin-Evapotranspiration Index (SPEI) expresses, as a standardized variate (mean zero and unit variance), the deviations of the current climatic balance (precipitation minus evapotranspiration potential) with respect to the long-term balance. The reference period for the calculation, in the SPEIbase, corresponds to the whole study period. Being a standardized variate means that the SPEI condition can be compared across space and time. Calculation of the evapotranspiration potential in SPEIbase is based on the FAO-56 Penman-Monteith method. Data type: float; units: z-values (standard deviations). No land pixels are assigned a value of 1.0x10^30. In some rare cases it was not possible to achieve a good fit to the log-logistic distribution, resulting in a NAN (not a number) value in the database. Dimensions of the dataset: lon = 720; lat = 360; time = 1356. Resolution of the dataset: lon = 0.5º; lat = 0.5º; time = 1 month. Created in R using the SPEI package (
Publisher version (URL)
ReferencesVicente-Serrano S.M., Beguería S., López-Moreno J.I., 2010: A Multi-scalar drought index sensitive to global warming: The Standardized Precipitation Evapotranspiration Index.
Vicente-Serrano S.M., Beguería S., López-Moreno J.I., Angulo M., El Kenawy A. (2010) A global 0.5° gridded dataset (1901-2006) of a multiscalar drought index considering the joint effects of precipitation and temperature.
Beguería S., Vicente-Serrano S.M., Angulo M. A multi-scalar global drought data set: the SPEIbase.
Appears in Collections:(EEAD) Conjuntos de datos
(IPE) Conjuntos de datos

Files in This Item:
File Description SizeFormat 01-month 1901-2009 SPEI320,07 MBNetCDF fileView/Open 02-month 1901-2009 SPEI319,7 MBNetCDF fileView/Open 03-month 1901-2009 SPEI319,39 MBNetCDF fileView/Open 04-month 1901-2009 SPEI319,12 MBNetCDF fileView/Open 05-month 1901-2009 SPEI318,88 MBNetCDF fileView/Open 06-month 1901-2009 SPEI318,66 MBNetCDF fileView/Open 07-month 1901-2009 SPEI318,44 MBNetCDF fileView/Open 08-month 1901-2009 SPEI318,24 MBNetCDF fileView/Open 09-month 1901-2009 SPEI318,03 MBNetCDF fileView/Open 10-month 1901-2009 SPEI317,81 MBNetCDF fileView/Open 11-month 1901-2009 SPEI317,59 MBNetCDF fileView/Open 12-month 1901-2009 SPEI317,37 MBNetCDF fileView/Open 13-month 1901-2009 SPEI317,15 MBNetCDF fileView/Open 14-month 1901-2009 SPEI316,93 MBNetCDF fileView/Open 15-month 1901-2009 SPEI316,7 MBNetCDF fileView/Open 16-month 1901-2009 SPEI316,47 MBNetCDF fileView/Open 17-month 1901-2009 SPEI316,22 MBNetCDF fileView/Open 18-month 1901-2009 SPEI315,98 MBNetCDF fileView/Open 19-month 1901-2009 SPEI315,72 MBNetCDF fileView/Open 20-month 1901-2009 SPEI315,46 MBNetCDF fileView/Open 21-month 1901-2009 SPEI315,21 MBNetCDF fileView/Open 22-month 1901-2009 SPEI314,94 MBNetCDF fileView/Open 23-month 1901-2009 SPEI314,68 MBNetCDF fileView/Open 24-month 1901-2009 SPEI314,42 MBNetCDF fileView/Open 25-month 1901-2009 SPEI314,16 MBNetCDF fileView/Open 26-month 1901-2009 SPEI313,9 MBNetCDF fileView/Open 27-month 1901-2009 SPEI313,64 MBNetCDF fileView/Open 28-month 1901-2009 SPEI313,39 MBNetCDF fileView/Open 29-month 1901-2009 SPEI313,13 MBNetCDF fileView/Open 30-month 1901-2009 SPEI312,86 MBNetCDF fileView/Open 31-month 1901-2009 SPEI312,61 MBNetCDF fileView/Open 32-month 1901-2009 SPEI312,35 MBNetCDF fileView/Open 33-month 1901-2009 SPEI312,09 MBNetCDF fileView/Open 34-month 1901-2009 SPEI311,82 MBNetCDF fileView/Open 35-month 1901-2009 SPEI311,57 MBNetCDF fileView/Open 36-month 1901-2009 SPEI311,31 MBNetCDF fileView/Open 37-month 1901-2009 SPEI311,05 MBNetCDF fileView/Open 38-month 1901-2009 SPEI310,79 MBNetCDF fileView/Open 39-month 1901-2009 SPEI310,54 MBNetCDF fileView/Open 40-month 1901-2009 SPEI310,27 MBNetCDF fileView/Open 41-month 1901-2009 SPEI310,02 MBNetCDF fileView/Open 42-month 1901-2009 SPEI309,76 MBNetCDF fileView/Open 43-month 1901-2009 SPEI309,51 MBNetCDF fileView/Open 44-month 1901-2009 SPEI309,25 MBNetCDF fileView/Open 45-month 1901-2009 SPEI309 MBNetCDF fileView/Open 46-month 1901-2009 SPEI308,74 MBNetCDF fileView/Open 47-month 1901-2009 SPEI308,48 MBNetCDF fileView/Open 48-month 1901-2009 SPEI308,22 MBNetCDF fileView/Open
file_list.txtList of all files comprising the SPEIbase2,91 kBPlain textView/Open
readme.txtNotes2,12 kBPlain textView/Open
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