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h3 { font-size: 3.3rem; color: #999; } /* CATEGORY -- ARCHIVE */ .category h2 { font-size: 18px; } .category article { margin-bottom: auto } .category div.site-inner { margin-bottom: 10%; } .category #genesis-sidebar-primary.sidebar.sidebar-primary.widget-area { margin-top: 160px; } .category-meet-a-desi-member h2 { font-size: 26px; font-weight: 700; padding-top: 20px; border-top: 2px solid #dedede; } .entry-header, .entry-title a { color: #00a0af; text-align: left; padding-bottom: 1%; font-weight: 600; font-size: 2.6rem;} .archive #genesis-sidebar-primary { background-color: #f8f8f8; padding: 0px; margin-top: 15%; } .archive #genesis-sidebar-primary h3.widget-title { font-size: 2rem; font-weight: 500; padding-bottom: 10px; } .archive #genesis-sidebar-primary h4.entry-title { font-size: 3rem; color: #00a0af; margin-bottom: 0; } .archive .sidebar .entry-title a { font-size: 2rem; color: #00a0af; margin-bottom: 0; } /* ARCHIVE PAGES */ .archive-description, .author-box { border-bottom: 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width: 12px; height: 12px; background-image: url(images/ext.png); background-size:24px 12px; background-repeat:no-repeat; background-position:-12px 0; margin-left:8px; float:none; } /* ---- Flex Gallery ---- */ .children { display: flex; flex-flow: row wrap; justify-content: space-around; min-height: 200px; } .child { flex: 0 0 auto; list-style-type: none; width: 30%; padding: 25px; border: solid 1px #ddd; font-size: 1.6rem; } .child a { background-color: #fff; display: block; padding: 0; background-repeat: no-repeat; background-size: contain; background-position: center top; color: #333333; text-decoration: none; text-align: center; position: relative; } .child h3 { text-decoration: none; text-align: center; font-size: 2.3rem; font-weight: 600; /* letter-spacing: 3px; */ color: #fff; line-height: 0; margin-bottom: 0; } /* ---- FOOTER ---- */ .social-links img { height: 40px; padding-right: 20px; } a.footer-button { color: white; padding: 16px; text-align: center; text-decoration: 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footer</a></li></ul><header class="site-header" itemscope itemtype="https://schema.org/WPHeader"><div class="wrap"><div class="title-area"><p class="site-title" itemprop="headline"><a href="https://www.desi.lbl.gov/">Dark Energy Spectroscopic Instrument (DESI)</a></p></div><div class="widget-area header-widget-area"><section id="nav_menu-20" class="widget widget_nav_menu"><div class="widget-wrap"><nav class="nav-header" itemscope itemtype="https://schema.org/SiteNavigationElement"><ul id="menu-main-navigation" class="menu genesis-nav-menu js-superfish"><li id="menu-item-59" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children menu-item-59"><a href="https://www.desi.lbl.gov/science/" itemprop="url"><span itemprop="name">/ science /</span></a> <ul class="sub-menu"> <li id="menu-item-994" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-994"><a href="https://www.desi.lbl.gov/science/" itemprop="url"><span itemprop="name">science overview</span></a></li> <li id="menu-item-77" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-77"><a href="https://www.desi.lbl.gov/cosmology-and-dark-energy/" itemprop="url"><span itemprop="name">cosmology and dark energy</span></a></li> <li id="menu-item-80" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-80"><a href="https://www.desi.lbl.gov/redshifts-and-distance/" itemprop="url"><span itemprop="name">redshifts and distance</span></a></li> <li id="menu-item-79" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-79"><a href="https://www.desi.lbl.gov/mapping-the-universe/" itemprop="url"><span itemprop="name">mapping the universe</span></a></li> <li id="menu-item-81" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-81"><a href="https://www.desi.lbl.gov/the-desi-science-mission/" itemprop="url"><span itemprop="name">the DESI science mission</span></a></li> <li id="menu-item-82" 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href="https://www.desi.lbl.gov/education-outreach/interactive-visualizations/" itemprop="url"><span itemprop="name">interactive visualizations</span></a></li> <li id="menu-item-2663" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-2663"><a href="https://www.desi.lbl.gov/education-outreach/swag-shop/" itemprop="url"><span itemprop="name">swag shop</span></a></li> </ul> </li> </ul></nav></div></section> </div></div></header><div class="site-inner"><div class="content-sidebar-wrap"><h1 class="entry-title" itemprop="headline">imaging data</h1> <main class="content" id="genesis-content"><article class="post-1506 page type-page status-publish entry" aria-label="imaging data" itemscope itemtype="https://schema.org/CreativeWork"><div class="entry-content" itemprop="text"><p>All Legacy Survey data used for selecting DESI targets is available at <a href="https://www.legacysurvey.org/" target="_blank" rel="noopener noreferrer">www.legacysurvey.org</a>.</p> <p>Target catalogs can be found <a href="https://data.desi.lbl.gov/public/ets/target/catalogs/" target="_blank" rel="noopener noreferrer">here</a>, in a format described <a href="https://desidatamodel.readthedocs.io/" target="_blank" rel="noopener noreferrer">here</a>.</p> <hr /> <p><strong><a href="https://ui.adsabs.harvard.edu/abs/2019AJ....157..168D/abstract" target="_blank" rel="noopener noreferrer">Overview of the DESI Legacy Imaging Surveys</a></strong><br /> This paper provides an overview of the Legacy Surveys project.</p> <p><a href="https://ui.adsabs.harvard.edu/abs/2020AJ....160...61B/abstract" target="_blank" rel="noopener noreferrer"><strong>Dynamic Observing and Tiling Strategies for the DESI Legacy Surveys</strong></a><br /> 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.</p> <p><strong><a href="https://ui.adsabs.harvard.edu/abs/2020MNRAS.496.2262K/abstract" target="_blank" rel="noopener noreferrer">Imaging Systematics and Clustering of DESI Main Targets</a></strong><br /> 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.</p> </div></article></main><aside class="sidebar sidebar-primary widget-area" role="complementary" aria-label="Primary Sidebar" itemscope itemtype="https://schema.org/WPSideBar" id="genesis-sidebar-primary"><h2 class="genesis-sidebar-title screen-reader-text">Primary Sidebar</h2><section id="nav_menu-41" class="widget widget_nav_menu"><div class="widget-wrap"><div class="menu-for-scientists-container"><ul id="menu-for-scientists" class="menu"><li id="menu-item-3398" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-3398"><a href="https://data.desi.lbl.gov/doc" itemprop="url">data releases [external]</a></li> <li id="menu-item-478" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-478"><a href="https://www.desi.lbl.gov/for-scientists/instrument-design/" itemprop="url">instrument design</a></li> <li id="menu-item-1508" class="menu-item menu-item-type-post_type 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