Short Summary of VizieR Help     [FAQ]
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This version of VizieR is date September 2007. Some useful hints for the VizieR usage:

• 2 colors are used throughout the VizieR pages:
         (green) for setup and searches which 
  	are dealing with or returning catalogues  
    (yellow) for setup and searches which 
  	are dealing with or returning entries extracted from catalogues,
  	i.e. lines from catalogue tables.  
  (if you are fed up with these colours, just 
  set up your own preferences)
  

• the symbol is a button that can be used to bookmark the current window. The way it works is to re-submit the same question, but keeping all the setup parameters (using a GET method). Once the page is reloaded, you can safely add the link to your browser's bookmarks or favorites.

• the selection around a position is always done by entering a position or the name of your favorite central object in the Target Name input box, and you can choose a circular or rectangular target geometry.

• once results are obtained, you may change the output layout via a simple click on the   ReSubmit  or the   Modify the Query  button.

• the results can also be formatted as tables readily useable by your favorite tools:
  • in TSV (tab-separated values) which can be easily interpreted by your favorite spreadsheet utility; files generated in this format can also be used to re-issue queries to VizieR with the Query from a file facility.
  • in several flavours of XML for interpretation by programs:
    • VOTable is a fully XML-compliant format containing both the data and their associated meta-data;
    • VOTable(CSV) is a replacement for astrores format where the meta-data in XML, but the data are keept as tab-separated values which are easier to process by e.g. Perl scripts;
    • KMZ/KML for Google-sky applications.
  • in FITS format for astronomically-oriented applications

• an illustration of the sky coverage of any catalog is presented in the form of clickable icons; these are activated by the footprints checkbox.

Overview

a query in VizieR can be achieved:

• either in the traditional way of stepping through the following actions:
  1. select one or a few catalogues to be queried
  2. define your constraints (selection on columns) and the result layout (choice of the columns to display, the format, the sorting order, etc).
  3. Get the results in a tabular form. Correlated data may be found by a simple mouse click.
  4. Full Display of individual rows if wished; correlated data may be found when existing.
  This traditional way accepts lists of contraints or targets saved in a file.

• or as a global search around a position on the sky addressed to all or to a subset of catalogues existing in VizieR: just fill the Target box and for more details, see the pages about Query from a Position.

A tutorial presents the basic VizieR functionnalities; this tutorial is also available as a set of ppt slides.

07 July 2004

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