MDM 8k reductions
Guest wrote on Oct 30, 2006
Hi,
I am starting to reduce some MDM 8k data, which I believe is similar
to the NOAO Mosaic data. The data consist of 8 ccd's, stacked into
an 8 dimensional fits image, with each ccd in a different image plane.
I ran across a description of the MSCREDÂ package. Â Is this package
designed to handle multi-dimensional images, without unstackingÂ
them? Â Could you point me to a users manual?
Also, someone mentioned to me that NOAO might have a data
pipeline available for an automated reduction of ccd images.
Is such a thing available? Â
Thanks,
Julia Kennefick Â
-------------------------------------------------------------
Julia Kennefick
Assistant Professor
Physics Department
University of Arkansas
226 Physics Building
Fayetteville, AR 72701
(479) 575-5916
jkennef@uark.edu ([email]jkennef@uark.edu[/email])
Post generated using Mail2Forum (http://www.mail2forum.com)
I am starting to reduce some MDM 8k data, which I believe is similar
to the NOAO Mosaic data. The data consist of 8 ccd's, stacked into
an 8 dimensional fits image, with each ccd in a different image plane.
I ran across a description of the MSCREDÂ package. Â Is this package
designed to handle multi-dimensional images, without unstackingÂ
them? Â Could you point me to a users manual?
Also, someone mentioned to me that NOAO might have a data
pipeline available for an automated reduction of ccd images.
Is such a thing available? Â
Thanks,
Julia Kennefick Â
-------------------------------------------------------------
Julia Kennefick
Assistant Professor
Physics Department
University of Arkansas
226 Physics Building
Fayetteville, AR 72701
(479) 575-5916
jkennef@uark.edu ([email]jkennef@uark.edu[/email])
Post generated using Mail2Forum (http://www.mail2forum.com)
Francisco Valdes wrote on Oct 30, 2006
Hello Julia,
MSCRED is designed to work with multiextension files (MEF) which is a different thing than a multidimensional format. However, there are tools which can be used to convert between formats. You might find useful the FITS Kernel document in the Docs section.
I have never heard of an observatory format for a mosaic such as you describe. The most common alternative to an MEF is a 2D image where the pieces are pasted into different parts of the image.
There is a task in MSCRED called MKMSC that was designed for converting the 2D image composite I just mentioned. However, I believe it could be used with a 3D image since you give arbitrary sections. So instead of describing the mosaic pieces as [nnn:nnn,nnn:nnn] you might be able to use [*,*,n] where n is a number. It would also be possible to build an MEF with low level imcopy commands:
cl> imcopy a[*,*,1] mef.fits[im1]
cl> imcopy a[*,*,2] mef.fits[im2,append]
etc
You might find getting the headers correct for MSCRED would then be a challenge.
As far as MSCRED documentation, many of the task are, unfortunately, without help pages. There is old users kind which is still probably fairly correct. If you have the mscred package installed then "phelp mscguide". There are also some useful help pages for setting up the astrometry and a generic mosaic header.
See
http://iraf.noao.edu/projects/ccdmosaic/generic/generic.html
http://iraf.noao.edu/projects/ccdmosaic/astrometry/astrom.html
http://iraf.noao.edu/projects/ccdmosaic/mscguide.html (same as mscguide)
NOAO is finishing a pipeline for data from our Mosaic Imager. However, this is a complex facility system and is not something for users.
Good luck,
Frank Valdes
MSCRED is designed to work with multiextension files (MEF) which is a different thing than a multidimensional format. However, there are tools which can be used to convert between formats. You might find useful the FITS Kernel document in the Docs section.
I have never heard of an observatory format for a mosaic such as you describe. The most common alternative to an MEF is a 2D image where the pieces are pasted into different parts of the image.
There is a task in MSCRED called MKMSC that was designed for converting the 2D image composite I just mentioned. However, I believe it could be used with a 3D image since you give arbitrary sections. So instead of describing the mosaic pieces as [nnn:nnn,nnn:nnn] you might be able to use [*,*,n] where n is a number. It would also be possible to build an MEF with low level imcopy commands:
cl> imcopy a[*,*,1] mef.fits[im1]
cl> imcopy a[*,*,2] mef.fits[im2,append]
etc
You might find getting the headers correct for MSCRED would then be a challenge.
As far as MSCRED documentation, many of the task are, unfortunately, without help pages. There is old users kind which is still probably fairly correct. If you have the mscred package installed then "phelp mscguide". There are also some useful help pages for setting up the astrometry and a generic mosaic header.
See
http://iraf.noao.edu/projects/ccdmosaic/generic/generic.html
http://iraf.noao.edu/projects/ccdmosaic/astrometry/astrom.html
http://iraf.noao.edu/projects/ccdmosaic/mscguide.html (same as mscguide)
NOAO is finishing a pipeline for data from our Mosaic Imager. However, this is a complex facility system and is not something for users.
Good luck,
Frank Valdes
Last post on Oct 30, 2006