Legacy Survey observations began in August 2014. For each of the Legacy Surveys (BASS, DECaLS and MzLS) each position in the sky (minus some small filling factor) will be observed in three "passes" in each of three filters (\(g\), \(r\), \(z\)). The passes are observed according to the following criteria:
|1||Photometric and seeing < 1.3 arcsec|
|2||(Photometric and seeing < 2.0 arcsec) OR (seeing < 1.3 arcsec) OR (all Pass 1 tiles completed)|
|3||Unphotometric OR seeing > 1.3 arc sec|
MzLS and BASS mostly observe regions at Dec ≥ 32° whereas DECaLS mostly observes regions at Dec ≤ 32°. MzLS observes solely in \(z\), BASS observes in \(g\) and \(r\), and DECaLS observes in all 3 filters.
In addition to observations carried out as part of the Legacy Survey, data releases will include reductions of data from other programs in (\(g\), \(r\), \(z\)) that overlap the Legacy Survey footprint.
The figures below depict the status of DECaLS as of Data Release 5 (DR5), the most recent release of DECaLS imaging. The coverage is color-coded by the number of passes. Area that is yet to be observed is marked in light gray. The lines track Galactic latitudes of 0°, -10° and +10°.
The figures below depict the status of MzLS and BASS as of Data Release 4 (DR4), the most recent release of MzLS and BASS imaging. The coverage is color-coded by the number of passes. Area that is yet to be observed is marked in light gray.