The CADC website is undergoing major changes to improve appearance, web content accessibility and functionality in both official languages. The goal is to provide simpler and more effective ways to access CADC services. Many older CADC web pages will no longer be accessible after April 2014. If you require assistance with this transition please email us here .

Le site du CCDA subit une transformation majeure pour améliorer l'apparence, l'accessibilité aux contenus Web et la fonctionnalité dans les deux langues officielles. L'objectif est de fournir des moyens simples et plus efficaces pour accéder aux services du CCDA. De nombreuses pages Web anciennes du CCDA ne seront plus accessibles après avril 2014. Si vous avez besoin d'aide avec cette transition, s'il vous plaît, communiquez avec nous ici

The MegaPipe
CFHTLS pages

Images and Catalogues
Ancillary Information
Related webpages

Send comments / suggestions / problems to:
CADC The Canadian Astronomy Data Centre
Herzberg Institute of Astrophysics
CADC Homepage

The MegaPipe CFHTLS pages


These pages present stacked images and catalogues for the CFHTLS Deep and Wide Fields. It provides links to the data, information on how the images and catalogues were produced and quality control information on the data.

If you use this data in a publication, please include the following acknowledgment:

"Based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/DAPNIA, at the Canada-France-Hawaii Telescope (CFHT) which is operated by the National Research Council (NRC) of Canada, the Institut National des Science de l'Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This work is based in part on data products produced at the Canadian Astronomy Data Centre as part of the Canada-France-Hawaii Telescope Legacy Survey, a collaborative project of NRC and CNRS."

Also, please cite the following paper: Gwyn 2012

Images and Catalogues
The following will give you links to the images and catalogues for the Deep and Wide fields. There are two versions of the Deep Fields: The "full" version contains all usuable data taken as part of the completed survey. In addition, "best seeing" versions of the Deep fields have been produced These images have final image qualities of 0.65 arcseonds. The selection of the best seeing images is dicussed in detail here. There is only one version of the Wide fields. Alternatively, you can browse the CFHTLS and retreive images, catalogs or image cutouts using a Google Maps type interface: For the Deep fields only, you can view the sky at a number of different wavelengths from X-ray to Radio, again using a Google Maps interface. Unified catalogues have been produced for the CFHTLS. Each catalogue covers an entire survey (Deep or Wide). If you do not wish to download the entire CFHTLS catalog, you may wish to use the catalog query service:

Ancillary Information


These data were generated by Stephen Gwyn of the University of Victoria and the Canadian Astronomical Data Centre. The first version of these images was produced and released shortly after the first Elixir-processed images became available from CFHT in early 2003. It became public 30 June 2006. Since then, new public version have been generated semi-annually. The previous public releases were:

  • 30 June 2006
  • 1 January 2007 (2007A)
  • 1 September 2007 (2007B)
  • 1 February 2008 (2008A)
All these versions are superseded by the current version.
Send comments/suggestions/problems to:

Valid HTML 4.01!

Canada NRC