The data was processed with MegaPipe in a similar manner to
the full CFHTLS-SG Deep stacks. (Read the details here.)
The individual queue run stacks are astrometrically registered to the
full stacks and are exactly the same size. The photometric calibration is also the same: all the images
are scaled to a photometric zero-point of 30 in AB magnitudes. The catalogues
were generated with SExtractor using this parameter file.
Not all the queue run data was processed. Only images with
seeing/image quality better than IQ=1.0" where included in the
stacks. The IQ values used for this determination are the Elixir
values, which are occasionally in error. Stacks were only generated
for queue runs where 5 or more suitable images were taken in a given
filter. This is why, for example, there are no stacks for the U-band
in the D2.
A significant fraction of the data is public. Some images are
still proprietary and may only be accessed by CFHTLS members.
For these data, you will need your CADC username and password.