Soar Optical Imager mosaicing

Guest wrote on Oct 13, 2005

From: Eduardo Cypriano <cypriano@ctiosz.ctio.noao.edu ([email]cypriano@ctiosz.ctio.noao.edu[/email])>Date: September 28, 2005 11:44:01 AM MST
To: Frank Valdes <valdes@noao.edu ([email]valdes@noao.edu[/email])>
Subject: Re: Soar Optical Imager mosaicing

Dear Frank Valdez,

no problems at all !

Unfrotunatelly, since most users will want to bin the CCD's fractional 
pixel shifting in needed.

In

ftp://ftp.ctio.noao.edu/cypriano/Frank

you may find two images: mosaiced and non-mosaiced, as well as a copy of 
the script used for the mosaicing.

You may find the headers of those images (5 for the non-mosaiced one and 1 
for the mosaiced) attached to this e-mail.

Bye,

Eduardo

On Wed, 28 Sep 2005, Frank Valdes wrote:

Hello Eduardo,

It appears you mail was misplaced in our tracking system.  I'm sorry  
for the delay in replying.  You are probably right that the error is  
due to something in the header you are copying.  To help you it would  
be better to send header listings of the input and output images  
(i.e. imheader <images> l+).  I don't know if you need subpixel steps  
but a simple way to tile images, though it may not be completely  
obvious since the task is quite versatile, is to use IMCOMBINE with  
the offsets parameter.  In this parameter you can use either a file  
containing the offsets or the "grid" option with something like "grid  
2 2050".

Let me know if I can be of help.  There are a variety of tasks which  
might be useful to deal with the SOAR imager.

Yours,
Frank Valdes

On Aug 31, 2005, at 1:22 PM, Eduardo Cypriano wrote:

Good afternoon,

I have wrote a very naive script to mosaic the images of the SOAR  
optical
imager, that I'm sending attached to this e-mail.

This instrument is a mini mosaic with just two  CCD's.
The script uses GEOTRAN for shifting the right CCD image on the y
direction (just two unbinned pixels) and tile both CCD images using
IMTILE, which also manages to introduce the correct gap between them.

The problem I'm having is that the final mosaiced image, produced by
IMTILE has no header. To solve this problem the script is coping the
header of one of the science extensions of the original image to the
mosaiced one with MOVEHEADER.

Everything looks fine, but when we try to do any operations on this
mosaiced image that involves sub-arrays
(e.g. imcopy m_tempelI.007.fits[*,*] bla.fits)
we got the following error message:
ERROR: MWCS: dimension mismatch (mw_translate)

I believe that this error is created because MOVEHEADER is copying the
header of one image to another with different dimensions, but I  
don't know
how to solve it.

Can you help me with this please ?

Thank you very much for your attention and my best regards,

Eduardo

-- 
Eduardo S. Cypriano                       Email:  
ecypriano@ctio.noao.edu ([email]ecypriano@ctio.noao.edu[/email])
SOAR Resident Astronomer

SOAR (Southern Astrophysical Research Telescope)
Casilla 603 La Serena, Chile
Phone:  +56-51-205348

<soimosaic.cl>

-- 
Eduardo S. Cypriano                       Email: ecypriano@ctio.noao.edu ([email]ecypriano@ctio.noao.edu[/email])
SOAR Resident Astronomer

SOAR (Southern Astrophysical Research Telescope)
Casilla 603 La Serena, Chile
Phone:  +56-51-205348

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Last post on Oct 13, 2005