The OpenArchive is an file based archive. The data is not stored in a database but in regular files. The FEWS FSS writes the data files directly to the archive data folder from the archive export workflows.

The time series are stored in NetCDF-files. Other data types are stored in xml or regular text files.

The facilitate searching in the archive a catalogue is used. The catalogue is based on Elastic, which is an open source tool for indexing data. The catalogue is populated by the harvester.

The harvester scans the data folder to discover which data sets are available in the archive and updates the catalogue accordingly. THREDDS, an open source software tool, is used to make the data accessible by FEWS and other third party applications. By using THREDDS the data can be downloaded by using HTTP. It addition THREDDS also supports protocols such as OpenDAP and WMS.

Image Added

Principle: file based storage, geïndexeerd via catalogus en beschikbaar gemaakt via thredds.

OpenArchive components

The OpenArchive comprises multiple software components including

• Thredds
• OpenArchive server

These components require both Java and Tomcat to be installed.

Architecture

Plaatje?