# WHOS Hydrological Observing System API

**Canonical:** https://apis.io/apis/wmo/whos-hydrological-api/  
**Provider:** World Meteorological Organization — https://apis.io/providers/wmo/  
**Base URL:** https://whos.geodab.eu/gs-service/services/essi  
**Documentation:** https://community.wmo.int/whos-web-services-and-supported-tools

WHOS Hydrological Observing System API is one of 9 APIs that [World Meteorological Organization](https://apis.io/providers/wmo/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Hydrology, Water, Observations, and Time Series. The published artifact set on APIs.io includes API documentation.

The WMO Hydrological Observing System (WHOS) provides multiple API interfaces for accessing global hydrological station data and time series. Available services include a REST/JSON DAB Observation and Measurement API, an OGC Sensor Observation Service (SOS), CUAHSI WaterML endpoints for compatibility with HydroDesktop and R WaterML libraries, and an ESRI Feature Server. All endpoints require a personal access token obtained via free registration at the WHOS registration portal. Supported views include whos-arctic, whos-plata, and the global whos view.

## Machine-readable artifacts (1)

- **Documentation** — https://community.wmo.int/whos-web-services-and-supported-tools

## Other World Meteorological Organization APIs (8)

- [World Weather Information Service API](https://apis.io/apis/wmo/world-weather-information-service-api/)
- [OSCAR/Surface REST API](https://apis.io/apis/wmo/oscar-surface-api/)
- [WIS2 Global Broker (MQTT)](https://apis.io/apis/wmo/wis2-global-broker-mqtt-api/)
- [World Meteorological Organization jobs API](https://apis.io/apis/wmo/wmo-jobs-api/)
- [World Meteorological Organization pywcmp-wis2-wcmp2-ets API](https://apis.io/apis/wmo/wmo-pywcmp-wis2-wcmp2-ets-api/)
- [World Meteorological Organization pywcmp-wis2-wcmp2-kpi API](https://apis.io/apis/wmo/wmo-pywcmp-wis2-wcmp2-kpi-api/)
- [World Meteorological Organization server API](https://apis.io/apis/wmo/wmo-server-api/)
- [World Meteorological Organization wis2-discovery-metadata API](https://apis.io/apis/wmo/wmo-wis2-discovery-metadata-api/)

## Tags

Hydrology, Water, Observations, Time Series

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/wmo/whos-hydrological-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/wmo/.