[fitsbits] start of Public Comment Period on the Green Bank convention

[Arnold Rots]

It's also explicitly referred to in WCS paper IV.

  - 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 Mon, Jun 22, 2015 at 3:04 PM, Bob Garwood <bgarwood at nrao.edu> wrote:

> The Green Bank convention is mentioned in WCS Paper I.  It's also used in
> the example header shown in Table 9 (apparently taken from a real example
> known to one of the authors) of WCS Paper 2, where 4  2048x2048 images are
> stored in separate rows of a table.  All 4 images share most of the same
> WCS except for the reference pixels on each axis.  keywords are used for
> most of the WCS, but columns are used to store the reference pixels.
> That's the Green Bank convention.
>
> Bob
>
>
> On 06/22/2015 02:43 PM, THIERRY FORVEILLE wrote:
>
>> The proposed draft text is available at
>>>>
>>>> http://sax.iasf-milano.inaf.it/~lucio/FITS/Conventions/greenbank-upd2.pdf
>>>>
>>> I have to say I find way of storing images pretty confusing. What's the
>>> advantage of storing them this way instead of creating separate FITS
>>> extensions?
>>>
>>>  The context of the use cases that I know of is one where the images are
>> 1D
>> (single-dish radioastronomical spectra), small (O(1Kpixels)), and numerous
>> (O(10^4)). Creating separate FITS extension would waste significant space
>> (of order a factor of two), and also would not outline as well the
>> structural
>> unity of the dataset.
>>
>>    Is it just of historical interest?
>>>
>>>  The convention is in use in single dish radio-astronomy. I don't know of
>> any use case outside that field.
>>
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>
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