![]() 2019) are a combination of three imaging surveys that have mapped two contiguous areas totaling 16,000 deg 2 in three optical bands ( g, r, and z) to depths 1–2 mag deeper than the Sloan Digital Sky Survey imaging (SDSS e.g., Abazajian et al. We demonstrate that the tiling and dynamic observing strategies jointly result in a more uniform-depth survey that has higher efficiency for a given total observing time compared with the traditional approach of using fixed exposure times. We present the tiling and observing strategies used by the first two of these surveys. To mitigate these effects, the Legacy Surveys (the Dark Energy Camera Legacy Survey, or DECaLS the Mayall z-band Legacy Survey, or MzLS and the Beiijing-Arizona Sky Survey, or BASS) employed a unique strategy to dynamically adjust the exposure times as rapidly as possible in response to the changing observing conditions. Our work addresses one of the major challenges of wide-field imaging surveys conducted at ground-based observatories: the varying depth that results from varying observing conditions at Earth-bound sites. The Dark Energy Spectroscopic Instrument Legacy Surveys, a combination of three ground-based imaging surveys, have mapped 16,000 deg 2 in three optical bands ( g, r, and z) to a depth 1–2 mag deeper than the Sloan Digital Sky Survey. Lawrence Livermore National Laboratory 7000 East Avenue, Livermore, CA 94550, USAĬerro Tololo Inter-American Observatory, NSF's Optical–Infrared Astronomy Research Laboratory Casilla 603, La Serena, ChileĬEA, Centre de Saclay, IRFU/DPhP, F-91191 Gif-sur-Yvette, France Stanford Law School, 559 Nathan Abbott Way, Stanford, CA 94305, USA Cherry Avenue, Tucson, AZ 85721, USAĭepartment of Physics & Astronomy, Siena College 515 Loudon Road, Loudonville, NY 12211, USA Steward Observatory, University of Arizona 933 N. Harvard-Smithsonian Center for Astrophysics Harvard University, 60 Garden Street, Cambridge, MA 02138, USAĭepartment of Physics, Ohio State University 191 West Woodruff Avenue, Columbus, OH 43210, USA Perimeter Institute for Theoretical Physics, 31 Caroline Street N, Waterloo, Ontario, N2L 2Y5, Canadaĭepartment of Physics and Astronomy, University of Waterloo, Waterloo, ON N2L 3G1, Canadaĭepartment of Physics & Astronomy University of Wyoming, 1000 E. Lawrence Berkeley National Laboratory One Cyclotron Road, Berkeley, CA 94720, USA Optical–Infrared Astronomy Research Laboratory P.O. ![]() Department of Astronomy, University of California at Berkeley 501 Campbell Hall #3411, Berkeley, CA 94720, USA
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