Archiving spectral line data at AO

Data organization: Records,Scans,Files,Directories, Archive Tables.

• The raw data is stored on disc ( 290 gigabytes of spectra jan2001->mar2003 ).

 
• RECORDS contain a header followed by data. 
      Typically one second records  are written to disc.

 
• Records are grouped into SCANS.
      A scan can be an:  on Position, off Position, strip of a map, etc..

 
• A FILE  contains the scans written at one session on the telescope. 
      The file naming convention contains the date and the project ID
      corfile.23feb03.a1412.1

 
• Files are stored in disc directories by project name.
      /proj/a1412/corfile....

 
• There are two types of ARCHIVE TABLES.

    File Table:    filename, location, size, ptrs into scan table.
    Scan Table: Scan information. One entry per scan
Each table is stored by month as IDL save files.