The Legacy Surveys

The Legacy Surveys are producing an inference model catalog of the sky from a set of optical and infrared imaging data, comprising 14,000 deg² of extragalactic sky visible from the northern hemisphere in three optical bands (\(g,r,z\)) and four infrared bands. The sky coverage is approximately bounded by -18° < δ < +84° in celestial coordinates and \(|b|\) > 18° in Galactic coordinates. To achieve this goal, the Legacy Surveys are conducting 3 imaging projects on different telescopes, described in more depth at the following links:

The Beijing-Arizona Sky Survey (BASS) The DECam Legacy Survey (DECaLS) The Mayall z-band Legacy Survey (MzLS)

Interactive Map

Current Release: Data Release 4

June 2017



The LBNL Physics Division is supported by the U.S. Department of Energy Office of Science High Energy Physics.

The Cerro Tololo Inter-American Observatory and the National Optical Astronomy Observatory are operated by the Association of Universities for Research in Astronomy (AURA) under cooperative agreement with the National Science Foundation.

The National Energy Research Scientific Computing Center, which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231, provided staff, computational resources, and data storage for this project.

The Computational HEP program in The Department of Energy's Science Office of High Energy Physics provided resources through the "Cosmology Data Repository" project (Grant #KA2401022).

Berkeley Lab LogoDepartment of Energy LogoNERSC LogoNOAO LogoAURA LogoNSF Logo