The WMO Hydrological Observing System (WHOS) facilitates hydrological data sharing. It is a multi-scale (local, national, regional and global) registry of hydrological data and information services catalogued using the standards and procedures developed by the Open Geospatial Consortium (OGC) and the WMO. This registry is the specialist hydrological component in the WMO Information System (WIS), and is open to all users and institutions from any country or level of government.
WHOS is being developed and implemented in two phases:
Phase 1 was completed in 2016 and provides a map interface with links to those NMHSs that make their real-time and historical hydrological data available online.
Phase 2 provides a services-oriented framework linking hydrological data providers and users through a hydrological information system enabling data registration, data discovery and data access that is fully compliant with the WMO Integrated Global Observing System (WIGOS) and WIS.