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The THREDDS Data Server (TDS) is a web server that provides metadata and data access for scientific datasets, using OPeNDAP, OGC WMS and WCS, HTTP, and other remote data access protocols. The TDS is developed and supported by Unidata, a division of the University Corporation for Atmospheric Research (UCAR), and is sponsored by the National Science Foundation.
Some of the technology in the TDS:
The THREDDS Data Server is implemented in 100% Java, and is contained in a single war file, which allows very easy installation into a servlet container such as the open-source Tomcat web server. Configuration is made as simple and as automatic as possible, and we have made the server as secure as possible. The library is freely available and the source code is released under the under the (MIT-style) netCDF library license.
Much of the realtime data available over the Unidata Internet Data Distribution (IDD) is available through a THREDDS Data Server hosted at Unidata on motherlode.ucar.edu. You are welcome to browse and access these meteorological datasets. If you need regular access to large amounts of data, please contact support-idd@unidata.ucar.edu.
TDS version 4.1 is the stable release.
TDS 4.1 uses the netCDF-Java 4.1 library and includes many bug fixes. Some of the key changes/improvements:
TDS version 4.0 is the previous stable release.
TDS 4.0 has many bug fixes and improvements "under the covers" that are not in the 3.17 release. Besides using the netcdf-java 4.0 library, the main new feature is the addition of an OGC WMS service, thanks to our collaborators Jon Blower (Univ. Reading UK) and Pauline Mak (Australian Research Collaboration Service) who did the hard work.
TDS version 3.17 is the latest of the pre-4.0 stable releases. It requires Java 1.5+. It is no longer being improved, and only critical bugs are being fixed.
THREDDS Catalogs are logical directories of on-line data resources, encoded as XML documents, which provide a place for annotations and other metadata about the data resources to reside. This is how THREDDS-enabled data consumers find out what data is available from data providers.
THREDDS Catalogs were originally designed for clients to use to access remote data. They have been extended to allow the TDS to use them for its own configuration. In this mode they are called TDS Configuration Catalogs, or server-side Catalogs. They contain information needed only on the server, which is removed when the TDS sends the catalog to the client, called the client-side or client-view catalog.
The TDS dynamically generates THREDDS catalogs based on the TDS configuration catalogs. For more information:
For client-side catalogs, the current specifications are:
The Common Data Model (CDM) coordinate system validator is no longer part of the TDS distribution. Instead it comes as a separate distribution.
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