WAPOR Daily Reference Evapotranspiration 3.0

  • The FAO/WAPOR/3/L1_RET-E dataset provides daily reference evapotranspiration in mm, simulating a well-watered grass surface.

  • This dataset, available from 2018-01-01 to 2025-07-13 with daily updates, is provided by FAO UN.

  • The data has a pixel size of 18924 meters and includes a single band representing daily reference evapotranspiration with a scale of 0.1.

  • The terms of use permit free use of this data for scientific and research purposes, consistent with FAO's open data principles.

  • Citations for this dataset include two technical reports published by FAO in 2018 and 2020 regarding the WaPOR Database Methodology.
FAO/WAPOR/3/L1_RET-E
Dataset Availability
2018-01-01T00:00:00Z–2025-07-13T00:00:00Z
Dataset Provider
Earth Engine Snippet
ee.ImageCollection("FAO/WAPOR/3/L1_RET-E")
Cadence
1 Day
Tags
agriculture fao wapor water water-vapor

Description

Reference evapotranspiration (RET) is defined as the evapotranspiration from a hypothetical reference crop and it simulates the behaviour of a well-watered grass surface. Each pixel represents the daily reference evapotranspiration in mm.

Bands

Pixel Size
18924 meters

Bands

Name Units Scale Description
L1-RET-E mm 0.1

Reference Evapotranspiration (Daily) [mm]

Terms of Use

Terms of Use

The Food and Agriculture Organization of the United Nations (FAO) is mandated to collect, analyze, interpret, and disseminate information related to nutrition, food, and agriculture. In this regard, it publishes a number of databases on topics related to FAO's mandate, and encourages the use of them for scientific and research purposes. Consistent with the principles of openness and sharing envisioned under the Open Data Licensing For Statistical Databases, and consistent with the mandate of FAO, data from the Water Productivity Open Access Portal (WaPOR), as part of AQUASTAT - FAO's Global Information System on Water and Agriculture, is available free to the user community.

Citations

Citations:

  • FAO 2018. WaPOR Database Methodology: Level 1. Remote Sensing for Water Productivity Technical Report: Methodology Series. Rome, FAO. 72 pages.

  • FAO 2020. WaPOR V2 Database Methodology. Remote Sensing for Water Productivity Technical Report: Methodology Series. Rome, FAO. https://www.fao.org/3/ca9894en/CA9894EN.pdf

Reference evapotranspiration (RET) is defined as the evapotranspiration from a hypothetical reference crop and it simulates the behaviour of a well-watered grass surface. Each pixel represents the daily reference evapotranspiration in mm.
FAO/WAPOR/3/L1_RET-E, agriculture,fao,wapor,water,water-vapor
2018-01-01T00:00:00Z/2025-07-13T00:00:00Z
-90 -180 90 180
Google Earth Engine