|
|
This is the CFHT Elixir Detrend Database & Image Collection. All of
the Master Detrend Images created to date by Elixir are available
here. There are directories containing the specific images, as well
as the detrend database table (a FITS table), detrend.db. If you have
the elixir programs, the detrend database can be used for automatic
lookup of the appropriate images. In this case, you have two choices.
You can grab the detrend.db file here, and the appropriate images for
your analysis, placing them in the same layout as given here,
maintaining the given names. The Elixir detrend database system won't
complain about missing detrend images unless they are needed for an
analysis. Alternatively, you may simply grab the images of interest,
and add them to your own version of the detrend database, using the
detregister program.
The detrend images are stored in directories by their detrend type
(dark, flat, etc). The flat-field images are placed in subdirectories
by filter. The naming convention uses the following layout for each file:
CRUNID.TYPE.FILTER.CCD.VERSION.fits
| CRUNID = camera run id (ie 01Ak01 = 2001/01/27 - 2001/02/06) |
| TYPE = detrend type (ie, flat) |
| FILTER = filter for light types, exposure time for dark types |
| CCD = 2 digits representing CCD number |
| VERSION = a version number to force the image names to be
unique |
Note that the flat-fields images since 01Ak01 are available in
multiple versions, one with and one without a scattered light
correction. For more information on the scattered light frames, see
the directory scat or the report on the scattered
light here.
|
|
