The Legacy Surveys cover 14,000 square degrees of the extragalactic sky, and yield high-quality optical and near-infrared photometric catalogs. The sky coverage is approximately bounded by -18° < δ < +84° in celestial coordinates and |b| > 18° in Galactic coordinates. Resulting images, models, and catalogs will enhance current and future wide area surveys such as SDSS/BOSS/eBOSS and DESI.
The Legacy Survey is a combination of the DECam Legacy Survey (DECaLS) using the Dark Energy Camera on the Blanco 4m telescope, the Mayall z-band Legacy Survey (MzLS) using the MOSAIC instrument on the Mayall 4m telescope, and the Beijing-Arizona Sky Survey (BASS) using the 90Prime instrument at the Steward Observatory Bok telescope.
|DECaLS||Blanco||g, r, z||9500 sq. deg|
|MzLS||Mayall||z||5000 sq. deg|
|BASS||Bok||g, r||5000 sq. deg|
|AllWISE||WISE||W1, W2, W3, W4||14000 sq. deg|
The eigth data release (DR8) is the first release to contain data over the entire footprint of the DESI survey, including data from MzLS (z band) and BASS (g & r bands) surveys (DR8-north}), and data from DECaLS (g, r, & z bands; DR8-south). The footprint of DR8 covers approximately 13,000 deg2 with 3 passes in all three optical filters (g, r, z), and over 19,000 deg2 with at least one pass in all three filters.
A sky map of the full imaging survey coverage is included below, color-coded by the depth in the z-band filter, and shown in an equatorial projection. The solid grey line traces the Galactic plane. (Figure credit: Dustin Lang).
Visit the Data Access page for instructions to access the database, retrieve Legacy Survey images, and catalogs.