[AstroPy] Astropy 0.3 and TPV projection

[Michael Droettboom]

I've created a pull request to add these to the documentation.  See here:

https://github.com/astropy/astropy/pull/1861

Comments welcome.

Mike

On 12/03/2013 04:22 PM, Michael Droettboom wrote:
>
> On 12/03/2013 03:49 PM, Kyle Barbary wrote:
>
>> 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?
>
> I don't think we do have it in the astropy documentation, but we 
> should. This is what it is (copied from the wcslib source code):
>
> |const char prj_codes[28][4] =
>    {"AZP", "SZP", "TAN", "STG", "SIN", "ARC", "ZPN", "ZEA", "AIR", "CYP",
>     "CEA", "CAR", "MER", "COP", "COE", "COD", "COO", "SFL", "PAR", "MOL",
>     "AIT", "BON", "PCO", "TSC", "CSC", "QSC", "HPX", "XPH"};|
> Mike
>
>> - Kyle
>>
>>
>> On Tue, Dec 3, 2013 at 2:42 PM, David Shupe <shupe at ipac.caltech.edu 
>> <mailto:shupe at ipac.caltech.edu>> wrote:
>>
>>
>>     On Dec 3, 2013, at 12:15 PM, Kyle Barbary <kyle at anl.gov
>>     <mailto: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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>>
>>
>>
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