Bitmasks

SDSS makes heavy use of the concept of a bitmask in spectroscopic target flags and other contexts. For the actual bit values for all SDSS flags, see the lists below. More detailed descriptions of the targeting bitmasks for the completed optical surveys and infrared surveys can be found in the DR17 release documentation.

The page using bitmasks provides help in using these bitmask with IDL, python, and CAS.

SDSS-V Bitmasks

Completed Survey Bitmasks

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