[AstroPy] Astropy 0.3 and TPV projection

[Kyle Barbary]

Thanks for the explanation David. I wonder if there should be a blurb
describing this, and listing the supported projections (that *are* part of
the WCS standard) in the astropy.wcs docs? Or is something like that
already there and I missed it?

- Kyle


On Tue, Dec 3, 2013 at 2:42 PM, David Shupe <shupe at ipac.caltech.edu> wrote:

>
> On Dec 3, 2013, at 12:15 PM, Kyle Barbary <kyle at anl.gov> wrote:
>
> The TPV projection [1] is also being used by the Dark Energy Survey. I
> think support for TPV would have to be implemented in Mark Calabretta's
> wcslib C library, which underlies astropy.wcs. It seems like programs that
> do support TPV generally use the "other" wcs library [2]. Does anyone know
> if support for TPV is planned for wcslib?
> It would be really nice to have.
>
>
> I believe Mark Calabretta is limiting his wcslib to implementing the WCS
> standard. TPV, like SIP [3], is a registered convention but is not a part
> of the official standard.
>
> As I understand it, there's some modification done to Calabretta's library
> in astropy.wcs to support SIP. Michael Droettboom is the expert on the
> details.
>
> I have code that translates between SIP and TPV [4] that I'd like to
> incorporate into astropy.wcs, but there's some paperwork to push through to
> be able to release it.
>
> David Shupe
> IPAC/Caltech
>
> [1] http://fits.gsfc.nasa.gov/registry/tpvwcs.html
> [2] http://tdc-www.harvard.edu/software/wcstools/libwcs.subs.html
>
>
> [3] http://fits.gsfc.nasa.gov/registry/sip.html
> [4]
> http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1363103 also
> at http://web.ipac.caltech.edu/staff/shupe/reprints/SIP_to_PV_SPIE2012.pdf
>
>
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