ASAP Water Satisfaction Index
User Manual of WSI version 3.0
ASAP (Anomaly hotSpots of Agricultural Production, https://agricultural-production-hotspots.ec.europa.eu) is a global early warning system about agricultural / rangeland production. Automatic warnings are based on anomalies of three indicators, currently SPI3 (Standardized Precipitation Index with scale length of 3 months), anomaly of Water Satisfaction Index and anomaly of cumulative FPAR (Fraction of absorbed Photosynthetically Active Radiation) from start of season.
This technical report describes the Water Satisfaction Index model that is used in the ASAP early warning system. The WSI is an indicator of crop (or rangeland) performance based on the availability of water to the crop during the growing season. It uses a rainfall and evapotranspiration in a water balance to estimate water available to the plant. The WSI is a quantitative measure used to assess the degree to which crop water requirements are met, taking into account both the amount and timing of water availability. The WSI values range from 0 to 100 %, where 100% indicates that the crop water requirements are fully met, and values below 100% indicate water stress, with lower values indicating more severe stress.
Data, methods and output format of the JRC-ASAP WSI are described in detail in this report.
BOOGAARD Hendrik;
VAN KRAALINGEN Daniel;
LOS S;
MERONI Michele;
VOJNOVIC Petar;
REMBOLD Felix;
2025-07-31
Publications Office of the European Union
JRC142711
978-92-68-30488-4 (online),
1831-9424 (online),
EUR 40404,
OP KJ-01-25-400-EN-N (online),
https://publications.jrc.ec.europa.eu/repository/handle/JRC142711,
10.2760/2838864 (online),
Additional supporting files
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