[fitsbits] Questions about the 'REFERENC' keyword.

[Randy Thompson]

Hi Joe,
   I just wanted to point out that the FITS standard you referenced
at our web site archive.stsci.edu is for FITS Standard Version 2.0.
You can find the latest (version 3.0) at
http://fits.gsfc.nasa.gov/fits_standard.html.
I see there is more information on the REFERENC keyword in the latest
version.

Randy




On 1/29/13 5:19 PM, "Joe Hourcle" <oneiros at grace.nascom.nasa.gov> wrote:

>
>I had some questions about the REFERENC keyword:
>
>	http://archive.stsci.edu/fits/fits_standard/node40.html#SECTION0094232000
>0000000000
>
>	REFERENC Keyword
>
>	The value field shall contain a character string citing a reference
>	where the data associated with the header are published.
>
>
>I could see a few different interpretations of this:
>
>	1. It's similar to the 'FITS Serialization' in VOTable, where you
>	   don't have the data attached, and can instead give a URL:
>
>	   http://www.ivoa.net/Documents/VOTable/20121205/votable.html#ToC36
>
>	   (although, in this case, I don't know if the URL would go to a
>	   complete FITS file, or the data portion without the HDU)
>
>	2. A URL to the archive or repository are available to
>	   download from
>
>	3. A reference (citation, URL, DOI or bibcode) to a published
>	   research article that uses the data.
>
>	4. A URL to a website with documentation on using the
>	   data
>
>So, question 1 : Which one is it intended to be used for?
>
>The only real-world examples that I've managed to find so far is
>WMAP LAMBDA, which seems to use it for a mix of 2, 3 & 4... but I don't
>know that it's valid to define it multiple times:
>
>	http://lambda.gsfc.nasa.gov/product/map/dr5/templates_fitshdr.cfm
>
>And GOODS/FORS2, which gives a bibcode for the first results paper:
>
>	http://archive.eso.org/cms/eso-data/eso-data-products/data-submission/spe
>ctrum-header.html
>
>
>And question 2 is only partially related :
>
>As it doesn't seem to be used for use #1, is there some standard way of
>providing a complete HDU with some reference to data that's not attached?
>
>I have some scientists who would like to review if the data's what they
>want *before* they download really large files ... and I'd rather use
>something FITS HDU-like, so they hopefully don't have to modify their
>existing tools as much.
>
>
>-----
>Joe Hourcle
>Programmer/Analyst
>Solar Data Analysis Center
>Goddard Space Flight Center
>
>
>
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