Where raw data is held metadata will be available, that is, information about one or more aspects of the main data. For seismic stations for example, this might be the station’s grid coordinates and the type of instruments used.

Metadata is often just as important as raw data and an important reason for storing metadata is to facilitate the discovery of relevant information and promote interoperability.

Metadata helps organise electronic resources, facilitates interoperability and legacy resource integration, provides digital identification and supports archiving and preservation. Interoperability is where multiple systems with different hardware and software platforms, data structures, and interfaces can exchange data seamlessly.

With increasing on-line resources, aggregate sites or portals like EPOS, are becoming more and more important.  

the 3-layers EPOS metadata structure





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