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- Standardized Precipitation Index, 01-month accumulation period (SPI-1)
- The Standardized Precipitation Index (SPI) is used to monitor the occurrence of meteorological droughts. The lower the SPI, the more intense is the drought. It is updated monthly.<br /><br />The SPI is a statistical index comparing the total precipitation received at a particular location during a period of n months with the long-term precipitation distribution for the same period of time at that location (reference period is 1981-2010). Monthly accumulation periods (n) are 1, 3, 6, 9, 12, 24 or 48 months. The corresponding SPIs are denoted as SPI-1, SPI-3, SPI-6, etc.<br /><br />Each accumulation period describes a different aspect of the drought and its potential impacts. The exact relationship between accumulation period and impact depends on the natural environment (e.g., geology, soils) and the human interference (e.g., existence of irrigation schemes). SPI-1 is an indicator for immediate impacts such as reduced soil moisture, snowpack, and flow in smaller creeks.<br /><br />The SPIs are calculated from the monthly precipitation data provided by the Global Precipitation Climatology Centre (GPCC - <a href="http://gpcc.dwd.de/" target="more">http://gpcc.dwd.de/</a>), specifically 'First guess' product for the two months prior to current month, then updated to 'Monitoring' product for the three months prior to current and backwards.<br /><br />Resolution is one decimal degree.
- dimensionless
- Creative Commons Attribution v4
- The proprietary rights and copyright of these data remain with the European Commission, Joint Research Centre (JRC). Reproduction for non-commercial purposes is authorised, provided the source is acknowledged. Reports, articles, papers, scientific and non-scientific works of any form, including tables, maps, or any other kind of output, in printed or electronic form, based in whole or in part on the data supplied, must contain an acknowledgement of the form: European Drought Observatory, https://edo.jrc.ec.europa.eu (C) European Commission - JRC, 2012 - 202x.
- climatologyMeteorologyAtmosphere
- EPSG:4326
- -180,-90,180,90
- 1 decimal degree
- 1981-01-01
- monthly
- European Commission DG Joint Research Centre (JRC)
- Alfred de Jager
- alfred.de-jager@ec.europa.eu
- McKee, T.B., N.J. Doesken and J. Kleist. 1993. The relationship of drought frequency and duration to time scale. In: Proceedingsof the Eighth Conference on Applied Climatology, Anaheim, California, 17?22 January 1993. Boston, American Meteorological Society, 179?184
- https://www.droughtmanagement.info/literature/AMS_Relationship_Drought_Frequency_Duration_Time_Scales_1993.pdf
- https://edo.jrc.ec.europa.eu/documents/factsheets/factsheet_spi.pdf
- http://data.europa.eu/89h/0a92348b-20c1-4689-bef9-e58267bc7544
- https://edo.jrc.ec.europa.eu/gdo/php/wms.php?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&LAYERS=spi&SRS=EPSG:4326&BBOX=-180,-90,180,90&WIDTH=512&HEIGHT=256&STYLE=&FORMAT=image/png&TIME=2020-10&TIMESCALE=01
- 2021-07-06
- [Less than or equal to -2, -2 to -1.5, -1.5 to -1] : Drier than normal; [-1 to 1] : Near Normal conditions; [1 to 1.5, 1.5 to 2, greater than or equal to 2] : Wetter than normal
- Current version: Version 1.2.0 covers data from 1981-01-01 to the current date. Version 1.2.0 notes: Change of GPCC Monitoring Product from v6 to v2020.
- SPI_0101
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