OpenET API Documentation - Satellite Evapotranspiration
Documentation and access point for the OpenET API delivering satellite-based field-scale evapotranspiration and water-use data (monthly from 2000, daily from 2016) across the western and conterminous United States.
openet.gitbook.io
At a glance
- Region
- United States (North America)
- Coverage
- North America
- Access
- Free
- Category
- NGO
- Last updated
- 2026
What's inside
- evapotranspiration
- water use
- satellite
- Landsat
Terms explained
What you can do with it
Typical work that data of this type supports.
- 01
No-gauge areas
Monitor places with no ground stations.
Because it has: satellite
- 02
Long records
Use consistent records going back decades.
- 03
Irrigation scheduling
Decide when and how much to irrigate.
Because it has: evapotranspiration
Where AI adds value
Ideas for machine learning and AI agents built on this kind of data.
- 01
Segmentation
Map water, crops and land use pixel by pixel with deep learning.
- 02
Data fusion
Blend satellite and ground data into one better estimate.
- 03
Field-scale ET
Estimate crop water use per field by combining satellite and weather with ML.
Machine access and documentation
Open API
REST API supporting field/polygon queries; keyed but free tier
Licence: Open data
Listed in our registry of open water APIs, which WaterDataGPT can query live.
Related water data
- OpenET 48-State EvapotranspirationNorth America | Free
- AgWeatherNet (Washington State University)North America | Free
- AZMET - Arizona Meteorological NetworkNorth America | Free
- Bureau of Reclamation AgriMet NetworkNorth America | Free
- Bushland Texas Crop Water Balance / Evapotranspiration Lysimeter DatasetsNorth America | Free
- CIMIS - California Irrigation Management Information SystemNorth America | Free
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