CatFile Interface V0.03

By F.-X. Pineau, CDS. rolllup

Informations about this page
  • This page is a prototype which provides an access to catalog files originally developed for the CDS cross-match service.
    Some of the large VizieR catalogs are now integrated in VizieR using this pure Java standalone tool (e.g. WISE_PRELIM, SAGE, 2MASS6X, ...).
  • In a catalog file, all rows have the same byte size and are ordered and indexed using HEALPix. For an overview of the structure of a catalog file, see "RowCatFile" in slide 12/18 of this IVOA talk, and see slide 7/16 of this ADASS talk.
  • The tool has been designed for large catalogs. It creates a positionally indexed binary file from an ASCII input and provides methods to access the generated file content. Cone search queries can be performed in a few 10's of milliseconds on a file containing more than 2 billion sources.
  • For more information, contact me at francois-xavier.pineau@astro.unistra.fr
  • Thanks to Thomas Boch for SAMP ;)
Catalog

  • VizieR table:
  • Description:
  • Number of rows:

Column selection rolllup
ColName Type Format Unit UCD Description
             
             
Sky area

Filter
Output


Catalog entries