All Legacy Survey data used for selecting DESI targets is available at www.legacysurvey.org.
Overview of the DESI Legacy Imaging Surveys
This paper provides an overview of the Legacy Surveys project.
Dynamic Observing and Tiling Strategies for the DESI Legacy Surveys
This paper 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. To mitigate these effects, the Legacy Surveys employed a unique strategy to dynamically adjust the exposure times as rapidly as possible in response to the changing observing conditions. We present the tiling and observing strategies used by two of these surveys.
Imaging Systematics and Clustering of DESI Main Targets
This paper evaluates the impact of imaging systematics on the clustering of DESI luminous red galaxy (LRG), emission-line galaxies (ELG), and quasar (QSO) targets. We study the effects of astrophysical foregrounds, stellar contamination, differences between north galactic cap and south galactic cap measurements, and variations in imaging depth, stellar density, galactic extinction, seeing, airmass, sky brightness, and exposure time. We also present survey masks and weights to mitigate these effects.