![FAO/WAPOR/3/L1_RET_E](https://developers.google.com/earth-engine/datasets/images/FAO/FAO_WAPOR_3_L1_RET_E_sample.png)

Dataset Availability
:   2018-01-01T00:00:00Z--2026-11-09T00:00:00Z

Dataset Producer
:


    [FAO UN](https://www.fao.org/in-action/remote-sensing-for-water-productivity/wapor-data-access/en)

Cadence
:   1 Day

Tags
:
    [agriculture](https://developers.google.com/earth-engine/datasets/tags/agriculture.md.txt) [fao](https://developers.google.com/earth-engine/datasets/tags/fao.md.txt) [wapor](https://developers.google.com/earth-engine/datasets/tags/wapor.md.txt) [water](https://developers.google.com/earth-engine/datasets/tags/water.md.txt) [water-vapor](https://developers.google.com/earth-engine/datasets/tags/water-vapor.md.txt)

#### 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

**Bands**

Pixel size: 34787.5x27830 meters (all bands)

| Name | Units | Scale | Pixel Size | Description |
|---|---|---|---|---|
| `L1-RET-E` | mm | 0.1 | 34787.5x27830 meters | 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](http://www.fao.org/3/ca7570en/ca7570en.pdf), and
consistent with the mandate of FAO, data from the [Water Productivity Open
Access Portal (WaPOR)](https://www.fao.org/in-action/remote-sensing-for-water-productivity/wapor-data-access/en), as part
of [AQUASTAT](http://www.fao.org/aquastat/en/) - 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>

### Explore with Earth Engine

> [!NOTE]
> **Important:** Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please [register for Earth Engine access.](https://console.cloud.google.com/earth-engine)

### Code Editor (JavaScript)

```javascript
var coll = ee.ImageCollection('FAO/WAPOR/3/L1_RET_E');
var image = coll.first();
Map.setCenter(17.5, 20, 3);
Map.addLayer(image, {min: 0, max: 100});
```
[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/FAO/FAO_WAPOR_3_L1_RET_E) [WAPOR Daily Reference Evapotranspiration 3.0](https://developers.google.com/earth-engine/datasets/catalog/FAO_WAPOR_3_L1_RET_E.md.txt) 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/2026-11-09T00:00:00Z -90 -180 90 180 Google Earth Engine https://developers.google.com/earth-engine/datasets

- [](https://doi.org/https://www.fao.org/in-action/remote-sensing-for-water-productivity/wapor-data-access/en)
- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/FAO_WAPOR_3_L1_RET_E)