WCS-related tasks

[Guest]

Hi David,

Msccmatch will work with single images. So you need to have an
initial WCS. Note that msccmatch is not a general matching method so
the assumption is that the WCS is off by a zero point shift, possibly
a small (~1deg) rotation and have some linear distortion.

In general many of the useful mscred tasks will work on single images
(mscdisplay, msczero, msccmatch, mscfinder, and mscimage are examples).

You are right that a general solution would involve imcoords
package. I just answered another similar question about ccxymatch.
This can do general solutions (much like the old FOCAS triangle match
routine) but it is a little sensitive to parameters.

I hope this helps.

Yours,
Frank

On Aug 16, 2005, at 3:06 PM, David Wittman wrote:

>
> Hi,
>
> I've been using mscred for a long time and have grown used to the
> efficiency of msccmatch for WCS fitting and installation. Is there
> anything like it for single CCD images? I'm aware of the imcoords
> package, but it seems like it would be a lot of work compared to
> msccmatch, which just runs by itself.
>
> Cheers,
>
> David Wittman
>
>
>



Post generated using Mail2Forum (http://www.mail2forum.com)

[Guest]

From: David Wittman <dwittman@physics.ucdavis.edu>
Date: August 26, 2005 12:51:33 PM MST
To: Frank Valdes <valdes@noao.edu>
Subject: Re: WCS-related tasks



Hi Frank,

Thanks for the info---I had no idea mscred tasks would work on
individual images. Anyway, it looked like a more general solution
was required, so I trained my student to use imcoords. I really like
msccmatch's integration of detection+matching+fitting. A similar tool
with the generality of imcoords would be on my wish list.

Cheers,

Dave


Frank Valdes wrote:

> Hi David,
> Msccmatch will work with single images. So you need to have an
> initial WCS. Note that msccmatch is not a general matching method
> so the assumption is that the WCS is off by a zero point shift,
> possibly a small (~1deg) rotation and have some linear distortion.
> In general many of the useful mscred tasks will work on single
> images (mscdisplay, msczero, msccmatch, mscfinder, and mscimage
> are examples).
> You are right that a general solution would involve imcoords
> package. I just answered another similar question about
> ccxymatch. This can do general solutions (much like the old FOCAS
> triangle match routine) but it is a little sensitive to parameters.
> I hope this helps.
> Yours,
> Frank
> On Aug 16, 2005, at 3:06 PM, David Wittman wrote:
>
>>
>> Hi,
>>
>> I've been using mscred for a long time and have grown used to the
>> efficiency of msccmatch for WCS fitting and installation. Is
>> there anything like it for single CCD images? I'm aware of the
>> imcoords package, but it seems like it would be a lot of work
>> compared to msccmatch, which just runs by itself.
>>
>> Cheers,
>>
>> David Wittman
>>
>>
>>




Post generated using Mail2Forum (http://www.mail2forum.com)