|Contains basic data for a Chunk|
| A Chunk is a unit for SDSS data export. It is a part of an SDSS stripe, a 2.5 degree wide cylindrical segment aligned at a great circle between the survey poles. A Chunk has had both strips completely observed. Since the SDSS camera has gaps between its 6 columns of CCDs, each stripe has to be scanned twice (these are the strips) resulting in 12 slightly overlapping narrow observation segments. |
Only those parts of a stripe are ready for export where the observation is complete, hence the declaration of a chunk, usually consisting of 2 runs.
|chunkID||bigint||8||ID_AREA||hash skyVersion, stripe, startMu, endMu|
|skyVersion||tinyint||1||CODE_MISC||0 = OPDB target, 1 = OPDB best|
|targetVersion||varchar||32||ID_VERSION||version of target software|
|startMu||int||4||arcsec||POS_LIMIT||Starting mu value|
|endMu||int||4||arcsec||POS_LIMIT||Ending mu value|