SPEIbase: Standardised Precipitation-Evapotranspiration Index database, Version 2.10

Dataset Availability: 1901-01-01T00:00:00Z–2023-01-01T00:00:00Z
Dataset Provider: Spanish National Research Council (CSIC)

Cadence: 1 Month
Tags: climate climate-change drought evapotranspiration global monthly palmer precipitation temperature water-vapor

Description

The Standardized Precipitation-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.

The SPEIbase is based on the FAO-56 Penman-Monteith estimation estimation of potential evapotranspiration. This is a major difference with respect to the SPEI Global Drought Monitor, that uses the Thornthwaite PET estimation. The Penman-Monteith method is considered a superior method, so the SPEIbase is recommended for most uses including long-term climatological analysis.

Bands

Pixel Size 55660 meters

Bands

Name	Min	Max	Pixel Size	Description
`SPEI_01_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous month
`SPEI_02_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 2 months
`SPEI_03_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 3 months
`SPEI_04_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 4 months
`SPEI_05_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 5 months
`SPEI_06_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 6 months
`SPEI_07_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 7 months
`SPEI_08_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 8 months
`SPEI_09_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 9 months
`SPEI_10_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 10 months
`SPEI_11_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 11 months
`SPEI_12_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 12 months
`SPEI_13_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 13 months
`SPEI_14_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 14 months
`SPEI_15_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 15 months
`SPEI_16_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 16 months
`SPEI_17_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 17 months
`SPEI_18_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 18 months
`SPEI_19_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 19 months
`SPEI_20_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 20 months
`SPEI_21_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 21 months
`SPEI_22_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 22 months
`SPEI_23_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 23 months
`SPEI_24_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 24 months
`SPEI_25_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 25 months
`SPEI_26_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 26 months
`SPEI_27_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 27 months
`SPEI_28_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 28 months
`SPEI_29_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 29 months
`SPEI_30_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 30 months
`SPEI_31_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 31 months
`SPEI_32_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 32 months
`SPEI_33_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 33 months
`SPEI_34_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 34 months
`SPEI_35_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 35 months
`SPEI_36_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 36 months
`SPEI_37_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 37 months
`SPEI_38_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 38 months
`SPEI_39_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 39 months
`SPEI_40_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 40 months
`SPEI_41_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 41 months
`SPEI_42_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 42 months
`SPEI_43_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 43 months
`SPEI_44_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 44 months
`SPEI_45_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 45 months
`SPEI_46_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 46 months
`SPEI_47_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 47 months
`SPEI_48_month`	-2.33	2.33	meters	Standardized Precipitation-Evapotranspiration Index (SPEI) where precipitation and evapotranspiration data was accumulated over the previous 48 months

Terms of Use

Terms of Use

The SPEI database is available under the CC-BY 4.0 license .

Any public use of the database or works derived from it must include proper attribution. Attribution should be given by referencing the document titled: Beguería, Santiago; Vicente Serrano, Sergio M.; Reig-Gracia, Fergus; Latorre Garcés, Borja; 2023; SPEIbase v.2.9 [Dataset]; DIGITAL.CSIC; Version 2.9. doi:10.20350/digitalCSIC/15470

Citations

Reig-Gracia, Fergus; Latorre Garcés, Borja; 2023; SPEIbase v.2.9 [Dataset]; DIGITAL.CSIC; Version 2.9. doi:10.20350/digitalCSIC/15470
Related publication: Vicente-Serrano S.M., Beguería S., López-Moreno J.I. (2010): A Multi-scalar drought index sensitive to global warming: The Standardized Precipitation Evapotranspiration Index - SPEI. Journal of Climate 23(7), 1696-1718. doi:10.1175/2009JCLI2909.1

DOIs

Explore with Earth Engine

Code Editor (JavaScript)

 // Retrieve the last date from the SPEI dataset. 
 var 
  
 dataset 
  
 = 
  
 ee 
 . 
 ImageCollection 
 ( 
 "CSIC/SPEI/2_10" 
 ). 
  
 filterDate 
 ( 
 '2022-12-01' 
 , 
  
 '2023-01-01' 
 ); 
 // Select the 24-month analysis. 
 var 
  
 spei24 
  
 = 
  
 dataset 
 . 
 select 
 ( 
 'SPEI_24_month' 
 ); 
 // Set the visualization ranges and color palette. 
 var 
  
 visParams 
  
 = 
  
 { 
  
 min 
 : 
  
 - 
 2.33 
 , 
  
 max 
 : 
  
 2.33 
 , 
  
 palette 
 : 
  
 [ 
  
 '8b1a1a' 
 , 
  
 'de2929' 
 , 
  
 'f3641d' 
 , 
  
 'fdc404' 
 , 
  
 '9afa94' 
 , 
  
 '03f2fd' 
 , 
  
 '12adf3' 
 , 
  
 '1771de' 
 , 
  
 '00008b' 
 , 
  
 ] 
 }; 
 // Set the map center to Spain's location. 
 Map 
 . 
 setCenter 
 ( 
 - 
 3.75 
 , 
  
 40.47 
 , 
  
 4 
 ); 
 // Display the SPEI 24-month layer. 
 Map 
 . 
 addLayer 
 ( 
 spei24 
 , 
  
 visParams 
 , 
  
 'SPEI 24 month' 
 );

Open in Code Editor

SPEIbase: Standardised Precipitation-Evapotranspiration Index database, Version 2.10

The Global SPEI database (SPEIbase) offers long-time robust information about drought conditions at the global scale, with a 0.5 degree pixel size and monthly cadence. It provides SPEI time scales from 1 to 48 months. The Standardized Precipitation-Evapotranspiration Index (SPEI) expresses, as a standardized variate (mean zero and unit variance), …

CSIC/SPEI/2_10, climate,climate-change,drought,evapotranspiration,global,monthly,palmer,precipitation,temperature,water-vapor

1901-01-01T00:00:00Z/2023-01-01T00:00:00Z

-90 -180 90 180

Google Earth Engine

https://developers.google.com/earth-engine/datasets

SPEIbase: Standardised Precipitation-Evapotranspiration Index database, Version 2.10 Stay organized with collections Save and categorize content based on your preferences.

Description

Bands

Terms of Use

Citations

DOIs

Explore with Earth Engine

Code Editor (JavaScript)

SPEIbase: Standardised Precipitation-Evapotranspiration Index database, Version 2.10