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<HTML> <!--## Parts of GLU tags to generate the mirrors:--> <head > <title K>ohonen map</title> <META name="description" content="The VizieR Service for Astronomical Catalogues (CDS, Strasbourg, France)"> <META name="keywords" content="VizieR"> <META name="keywords" content="Astronomical database"> <META name="keywords" content="Astronomical catalogues"> <!-- Include the CSS stylesheet for the CDS navbar and footer: --> <link href="/cds-navbar-resources/css/cdsnavbar.min.css" rel="stylesheet"> <!-- Include OpenSearch engines for CDS services: --> <link title="SIMBAD" rel="search" type="application/opensearchdescription+xml" href="/cds-navbar-resources/opensearch/simbad.xml"> <link title="VizieR" rel="search" type="application/opensearchdescription+xml" href="/cds-navbar-resources/opensearch/vizier.xml"> <link title="Aladin" rel="search" type="application/opensearchdescription+xml" href="/cds-navbar-resources/opensearch/aladin.xml"> <link title="XMatch" rel="search" type="application/opensearchdescription+xml" href="/cds-navbar-resources/opensearch/xmatch.xml"> </head> <body> <!-- -- ####################################################################### -- # # -- # CDS TOP NAVIGATION BAR # -- # # -- ####################################################################### --> <nav class="cds-menu for-vizier" role="menubar" aria-label="CDS services navigation" data-pagefind-ignore> <!-- HEADER: CDS WEBSITE LINK --> <header><a href="https://cds.unistra.fr" role="menuitem" aria-label="CDS website"></a></header> <!-- MENU CONTENT --> <ul role="menu" aria-label="CDS services"> <!-- List of all services (collapsed on very small screens) --> <li class="is-collapsed-when-very-small" role="none"> <!-- Trigger for showing the menu on very small screens --> <span class="menu-trigger for-all-services" tabindex="0" onclick="void(0)" role="menuitem" aria-label="List CDS services and more" aria-haspopup="true" aria-expanded="false"><span>Services</span></span> <!-- CDS main services --> <ul role="menu" aria-label="CDS main services"> <li role="none"><a class="portal" href="http://cdsportal.u-strasbg.fr" role="menuitem" aria-label="CDS Portal"><span></span></a></li> <li role="none"><a class="simbad" href="http://simbad.cds.unistra.fr/simbad" role="menuitem" aria-label="Simbad"><span></span></a></li> <li role="none"><a class="vizier" href="https://vizier.cds.unistra.fr/viz-bin/VizieR" role="menuitem" aria-label="VizieR"><span></span></a></li> <li role="none"><a class="aladin" href="http://aladin.cds.unistra.fr/aladin.gml" role="menuitem" aria-label="Aladin"><span></span></a></li> <li role="none"><a class="xmatch" href="http://cdsxmatch.u-strasbg.fr" role="menuitem" aria-label="X-Match"><span></span></a></li> <!-- SUB-MENU: Other CDS services --> <li role="none"> <!-- Trigger for showing the sub-menu --> <a class="menu-trigger for-other-services" tabindex="0" onclick="void(0)" role="menuitem" aria-label="Other resources" aria-haspopup="true">Others</a> <!-- Sub-menu itself --> <ul role="menu" aria-label="Other resources"> <li role="none"><a href="https://cds.unistra.fr/cgi-bin/Sesame" role="menuitem" aria-label="Sesame name resolver">Sesame name resolver</a></li> <li role="none"><a href="https://cds.unistra.fr/cgi-bin/Dic-Simbad" role="menuitem" aria-label="Dictionary of nomenclature">Dictionary of nomenclature</a></li> <li role="separator" class="divider" aria-hidden="true"></li> <!-- Link: email CDS-Question--> <li role="none"><a href="mailto:cds-question@unistra.fr" tabindex="0" role="menuitem" aria-label="Contact us">Contact us</a></li> </ul> </li> </ul> </li> <!-- Link: CDS help resources --> <li role="none"><a class="help" href="https://cds.unistra.fr/help" role="menuitem" aria-label="Help resources"><span>Help</span></a></li> </ul> </nav> <div class="cdsPageTitle"><h1>The VizieR Kohonen map</h1></div> <TABLE> <TR> <TD width='5%'></TD> <TD> <spacer type="VERTICAL" size="16"> This <b>Kohonen Self-Organizing Map</b> is based on a neural network analysis of the keywords associated to the catalogues (see Poincot et al., <a href="http://simbad.cds.unistra.f/rcgi-bin/cdsbib?1998A%26AS..130..183P">1998A&AS..130..183P</a>; and Lesteven et al., <a href="http://cds.unistra.fr/misc/stiamurt.htx">1996VA.....40..395L</a>)<p> Each dot marks a map area; colour denotes the <em>density</em> or the <em>clustering tendency</em> of the documents; deep blue areas have the lowest density. Just click any area on the map to get the corresponding list of catalogues found in that area. </TD><TD> <a href="/viz-bin/catmap"><img src="/vizier/catmap.gif" alt="(Catalogue Map)" ismap="ismap" align="right" height="340" width="340"></a> <TD width='5%'></TD> </TD></TR> </TABLE> <!-- -- ####################################################################### -- # # -- # CDS FOOTER # -- # # -- ####################################################################### --> <footer class="cds-footer for-vizier" data-pagefind-ignore> <div class="cds"> <!-- CDS Logo and link --> <a class="cds logo" href="https://cds.unistra.fr" title="CDS - Centre de Donn茅es astronomiques de Strasbourg" target="_blank"></a> <!-- Social networks links --> <div class="socials"> <a class="email" title="Send an email to the CDS team." href="mailto:cds-question@unistra.fr?Subject=VizieR%20service"></a> <a class="rss" title="RSS Feed of the CDS news" href="https://cds.unistra.fr/news/rss.php" target="_blank" rel="noopener noreferrer"></a> <a class="facebook" title="CDS' Facebook page." href="https://www.facebook.com/CDSportal/" target="_blank" rel="noopener noreferrer"></a> <a class="youtube" title="CDS' Youtube channel." href="https://www.youtube.com/@CDSportal" target="_blank" rel="noopener noreferrer"></a> <a class="github" title="CDS' GitHub page." href="https://github.com/cds-astro" target="_blank" rel="noopener noreferrer"></a> </div> </div> <div class="service"> <div class="content"> </div> </div> <div class="legal-links"> <a href="https://cds.unistra.fr/about/contact/">Contact</a> - <a href="https://cds.unistra.fr/legals/">Legals</a> </div> </footer> </body> </HTML>