Bannière Centre de données astronomiques de Strasbourg Centre de données astronomiques de Strasbourg

The Strasbourg astronomical data center (CDS) provides reference astronomical services:

  • SIMBAD is the reference database for identification and bibliography of astronomical objects (outside the solar system).
  • VizieR is a catalogue service for large sky surveys, catalogues and tables published in academic papers, and more and more other data associated to publications.
  • The interactive sky atlas Aladin provides an interactive portal to access image collections and databases available via Virtual Observatory protocols.
  • The CDS cross-match service allows to do positional cross-matching of very large catalogues.

Aladin data collections tree : advanced usage

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We introduced in another tutorial the Aladin desktop data collections tree, and we will now demonstrate advanced available features.

  1. First of all, you can rearrange or sort the tree in different ways: using the "Sort" button at the bottom, you can rearrange the tree for example by wavelength domain, or by publication year.
  2. The sorting can be applied to all leaves under a given node by first selecting it, and using the dedicated sort button.
  3. There are various icons used for data collections : first an icon identifying the data provider, an RGB icon to quickly distinguish colour compositions from single band images, and a small yellow asterisk to identify new collections.
  4. The tree can be also filtered by sophisticated advanced rules, clicking on the dedicated button, for example catalogues with proper motions.
  5. These advanced filters can be named and stored for future usages, in addition to predefined ones.
  6. For some data collections, the information on spatial coverage is not readily available : they appear in grey, and are identified with a small orange icon. One can use the "scan" button to query if such a service has an overlap with the current field of view or not.

Download Aladin desktop : http://aladin.u-strasbg.fr/java/nph-aladin.pl?frame=downloading

Mots clés : aladin aladindesktop cds data access tutorial

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