What is ODB?
ODB (Observation DataBase) is a database developed at ECMWF to store and retrieve large volumes of meteorological observational and feedback data efficiently for use within the IFS.
Currently, ODB comes in two flavours:
- ODB-1 (the original hierarchical table format capable of running in a parallel environment within IFS)
ODB-2 (a new flat format with a modern API used for archiving in MARS).
Data from ODB can be extracted using the ODB/SQL query language, which is generally a small subset of SQL with some useful extensions.
The home of the ODB software can be found here.
How to use Metview with ODB?
Metview automatically recognizes both ODB-1 and ODB-2 formats and assigns the very same icon to them in the user interface:
The meta-data and data contents of an ODB can be inspected with the ODB Examiner, which can be either started up from the user interface (right-click examine on the icon) or from the command line using the following command:
There are two more Metview icons associated with ODB: the ODB Filter icon
that can perform an ODB/SQL query resulting in a new ODB and the ODB Visualiser icon
with which ODB data can be visualised (and optionally filtered) using various techniques and plot types.
Script language support
Metview provides full support for ODB from its Macro and Python interfaces. The full list of available functions can be found on the ODB Functions page. For elaborated examples please study the tutorials and see the Gallery.
Tutorials
The main tutorial about using ODB in Metview can be found here. There is also a shorter tutorial available on this page.
Gallery
The Gallery features a few ODB-related examples showcasing both the ODB Filter and ODB Visualiser icons.
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