Given the vast amounts of data publishing portals UNOOSA decided not to collect datasets and metadata thereof itself, but to encourage the use of portals that have the potential of a more global approach to data search. If you would like to publish data and make it available to this community we suggest to become a data provider at the GEOSS Portal. Other data portals can be found under Projects/ Missions / Community Portals.
In the meantime UNOOSA is working on an integration of a GEOSS data search to provide their services on this portal.
In order to facilitate a uniform exchange of data, standards are very important.
For a contribution of data to the community it is a recommended practice to use ISO 19115 or WaterML.