[AstroPy] [SciPy-user] FITS images with header-supplied axes?
Bridgman, William T.
Tue Apr 1 12:51:46 CDT 2008
I agree there is some lack of coordination on some of these
projects. Such is the nature of Open Source.
I think there is also an issue where some of the projects are
overkill for what individuals might need for production-pipeline/
research/educational uses. Hence many of us start from scratch to
keep the work compact. It's only later that we discover others
working in similar directions.
I obtained a copy of pywcs many months ago, trying to get
heliographic coordinate systems installed. Other priorities
intervened and by the time I got back to it, migration to numpy and
changes in pyFITS seemed to break the previous version. I didn't get
a chance to make any revisions operational.
Would there be any interest in members of the list publishing a short
description of what types of modules they are designing in their own
work? It might be worthwhile for coordination & possible
collaborations. My requirements for work projects are quite
different from my recreational & educational python projects.
On Apr 1, 2008, at 10:41 AM, email@example.com wrote:
> I just want to discuss about a problem that our python astronomer
> have and the
> answer from Perry is a very good example of it. There are too many
> which are doing exactly the same thing and essentially because
> nothing is
> centralized or worst, in the case of pywcs, not advertised.
> For example Perry told us about pywcs developped by STSCI (it was
> the first
> time I saw any reference to this project) but Adam spoke about
> astlib ( http://astlib.sourceforge.net/ ) which are different
> package with
> exactly the same goal and I did myself something similar (even if
> it was fast
> and dirtier).
> I think it's time to try to identified the most important task that
> astronomer are needing and try to centralized all the effort at the
> place. The astropy mail list is probably a good start as the
> astropy.scipy.org website.
> Perhaps we can start to identified the need and desiderata. We will
> have too
> many but that some most important or urgent must be identified. As
> we clearly needed the pywcs and thanks to STSCI we have it now. We
> also need
> a package to plot our data, images etc. Matplotlib is very good but
> does have
> a major problem (at least for my point of view), it's slow, very
> slow for big
> array or can't even produce the image if the image is too big. ( If I
> remember a precedent discussion, the problem is mainly due to Agg.)
> After we need to know, if possible, for which project if someone is
> something, who and how to contact him/her. So interested people can
> eventually help him/her to do it. It's seems that STSCI is doing
> most of the
> work but I'm pretty sure that other people are willingly to help
> them to
> extend python to be the ideal tool for astronomer.
> Just my 2 cents,
> Le Sunday 30 March 2008 10:54:04 Perry Greenfield, vous avez écrit :
>> On Mar 28, 2008, at 8:28 PM, Keflavich wrote:
>>> Is there any plotting routine in scipy / matplotlib that can plot a
>>> fits image with correct WCS coordinates on the axes? I know pyfits
>>> can load fits files, astLib has routines to interpret header
>> coordinates, and I think you can make the axes different using
>>> matplotlib transforms, but is there anything that puts all three
>>> together currently available?
>> Well, we (STScI) recently wrapped WCSLIB to obtain a mapping function
>> between pixel and sky coordinates for python (you can find it as
>> pywcs in
>> astrolib on scipy; that may have been what you were referring to).
>> But I'm not sure you understand what you are asking for with
>> regard to
>> matplotlib. The new transforms stuff should make it much easier to
>> the sky coordinates in the interactive display. The axis labeling
>> is a
>> different matter. Suppose your image (let's say it's 1Kx1K for the
>> sake of
>> discussion) is rotated 45 degrees with regard to north (either
>> way, it
>> doesn't really matter). What would you expect to see for axis
>> labels? I
>> don't think it is at all obvious how people would want labeling to
>> be done
>> along the edges of the image. I can imagine someone wanting axes
>> or grids
>> superimposed on the image itself, but that's not quite the same
>> thing. Do
>> you want the image rotated so that it is resampled on to RA and
>> Dec and
>> displayed that way?
>> In any event, no we haven't yet done anything to try to integrate
>> all three
>> things. Among other things we wanted to make sure that the api for
>> the wcs
>> info was suitable before doing a lot with it (and in the meantime,
>> Mike is
>> working on rewriting drizzle which is taking a lot of his time).
>> SciPy-user mailing list
> AstroPy mailing list
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