Reflections on SIA V2 and generic cutout services

[Arnold Rots]

And the bounding box, I presume, should be defined in the tangent plane
- oriented along the native coordinate system.

Cheers,

  - Arnold

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Arnold H. Rots                                          Chandra X-ray
Science Center
Smithsonian Astrophysical Observatory                   tel:  +1 617 496
7701
60 Garden Street, MS 67                                      fax:  +1 617
495 7356
Cambridge, MA 02138
arots at cfa.harvard.edu
USA
http://hea-www.harvard.edu/~arots/
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On Thu, Mar 10, 2016 at 3:52 AM, Markus Demleitner <
msdemlei at ari.uni-heidelberg.de> wrote:

> Hi,
>
> On Wed, Mar 09, 2016 at 11:22:21AM +0100, François Bonnarel wrote:
> >
> > Le 08/03/2016 10:08, Markus Demleitner a écrit :
> > >>   - The spatial subsetting is not well defined.  E.g., if I'm asking
> for a
> > >>spatial subset where I've given  POS=CIRCLE 12 34 0.5 what do I get
> back?
> > >Well, services are supposed to take the bounding box within their
> > >native coordinates.
> > The current draft says it is in ICRS . It says also that we may plan to
> have
> > variable Coordinate System in next version
>
> Oh, the "native system" was the answer to the question "What
> coordinates, projection?" in Tom's mail.  So the long version is:
>
>   The region inteded to be cut out is obtained by transforming the
>   specification passed in to the dataset's native coordinate system and
>   taking the shape's bounding box there.
>
> I suppose something like this should be made clear in the spec.
>
> Cheers,
>
>         Makrus
>
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