[AstroPy] Handling IRAF at ccmap astrometry solution with Astropy

[JJ Kavelaars]

Hi,

If you have access to IRAF you can use the ccsetwcs to put the ccmap database version of the WCS into the FITS header:

http://iraf.noao.edu/scripts/irafhelp?ccsetwcs <http://iraf.noao.edu/scripts/irafhelp?ccsetwcs>

Then astropy will understand the WCS.  But that will only provide the linear components. 

JJ


> On Mar 25, 2020, at 2:56 AM, Laurent MICHEL <laurent.michel at astro.unistra.fr> wrote:
> 
> Dear Astropy,
> 
> In the project I'm working on (SVOM), I have to resolve image astrometry with parameters given as IRAF at ccmap input files (*.db).
> I've pasted a sample below.
> As I'm not an IRAF user and my application is Python based, I would like to know whether someone in the community would have some experience with handling such coordinate transformations with AstroPy or some associate package.
> 
> Regards
> LM
> 
>> begin	first
>> 	xrefmean	1006.983846153846
>> 	yrefmean	1295.986153846154
>> 	lngmean		51.92749369230773
>> 	latmean		46.71962446153846
>> 	pixsystem	logical
>> 	coosystem	j2000
>> 	projection	tan
>> 	lngref		51.92764538984333
>> 	latref		46.71980701217847
>> 	lngunits	degrees
>> 	latunits	degrees
>> 	xpixref		1006.538812424377
>> 	ypixref		1296.240113815674
>> 	geometry	general
>> 	function	legendre
>> 	xishift		785.057480503327
>> 	etashift	-1011.192209060798
>> 	xmag		0.780016468878781
>> 	ymag		0.7800388866873553
>> 	xrotation	180.0054358489221
>> 	yrotation	0.003364033436420988
>> 	wcsxirms	0.03777045679395438
>> 	wcsetarms	0.04621390005594472
>> 	xirms		0.02446609811977102
>> 	etarms		0.03292506146030702
>> 	surface1	11
>> 			2.	2.
>> 			2.	2.
>> 			2.	2.
>> 			0.	0.
>> 			1.	1.
>> 			2048.	2048.
>> 			1.	1.
>> 			2048.	2048.
>> 			-14.02246741249724	-211.9665257906808
>> 			-798.346852301705	0.07577120489887789
>> 			0.04687505246502031	798.3697991484097
>> 	surface2	14
>> 			2.	2.
>> 			3.	3.
>> 			3.	3.
>> 			2.	2.
>> 			1.	1.
>> 			2048.	2048.
>> 			1.	1.
>> 			2048.	2048.
>> 			0.01209115687180025	-0.01371667420039151
>> 			-0.001595934377758362	0.01973382792045219
>> 			0.01870940742458613	-0.03495580079513902
>> 			-0.04682685192837127	0.05029843125259523
>> 			0.02206659476379174	-0.06407294737100595
>> 			0.09651497861498953	-0.103465418301487
>> # Fri 10:57:09 13-Mar-2020
> 
> 
> 
> -- 
> ---- Laurent MICHEL              Tel  (33 0) 3 68 85 24 37
>     Observatoire de Strasbourg  Fax  (33 0) 3 68 85 24 32
>     11 Rue de l'Universite      Mail laurent.michel at astro.unistra.fr
>     67000 Strasbourg (France)   Web  http://astro.u-strasbg.fr/~michel
> ---
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