1.5 How to Read Yohkoh Database Tapes (RD_YDBTAP)

RD_YDBTAP reads and installs Yohkoh Data Base (ydb) files from the distributed ``ydb'' tapes. A ``ydb'' tape contains data files which are used by the Yohkoh analysis system. These may include both Yohkoh specific data (e.g., Yohkoh pointing, ephemeris, observing logs, etc.) and supporting data sets (GOES, BATSE). Although some of the smaller database (ydb) sets are available as compressed tar files and are included in the installation and upgrade procedure, the ydb tapes are the recommended method for distribution of large database sets (such as pointing data and observing log files).

RD_YDBTAP Functions:

• Provide graphical interface which allows user to specify database sets for extraction; selection may be by ydb file type and/or times.
• Using ydb tape directory file, compare directory contents with user requests and flag any discrepancies.
• If output directory is not specified, use site specified Yokhoh environment to place files in proper locations.
• Optionally create required directories which do not exist.
• Using directory file information on file sizes and local output directory status, warn user if there is insufficient disk space to satisfy requests.

     The following example will allow the user how to interactively select times and data sets for extraction and installation
IDL> rd_ydbtap
    Several options are available on input - if files are fully specified, no additional user interaction is required. The next example would extract and install all data base files for the specified week using tape drive one.
IDL> rd_ydbtap, dev=1, weekid='92_45', /all
RD_YDBTAP may function to ``boot up'' a remote system prior to implementation of a ydb network upgrade system. Due to the potential of adversely impacting the network, a network-based ydb upgrade system should be coordinated with the Yohkoh SW managers. They can provide some Unix scripts which assist in this task and allow some scheduling control. For more information on network upgrades of the Yohkoh data base, send e-mail to:

        software@isass0.solar.iasa.ac.jp, SUBJ="ydb via network"