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[fitsbits] Start of the FITS Euro3D Public Comment Period



 
 
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  #1  
Old November 9th 07, 10:30 PM posted to sci.astro.fits
William Pence
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Default [fitsbits] Start of the FITS Euro3D Public Comment Period

This is to announce the start of the 30-day Public Comment Period on the
Euro3D FITS convention. This convention has been submitted for
inclusion in the 'Registry of FITS Conventions' which is maintained by
the IAU FITS Working Group. This is the 11th in a growing series of
conventions submitted to the Registry.

The Euro3D data interchange format is used for storing data from
integral field spectrographs in which 1-dimensional spectra are obtained
at multiple positions over a 2-dimensional spatial field of view. Each
spectrum is stored as a vector in one row of a binary table, along with
other columns containing parameters describing the spectrum (such as
it's location in the 2D field).

A document describing this convention and a sample FITS file that uses
it are available for public review and comment from the FITS registry
web page at

http://fits.gsfc.nasa.gov/fits_registry.html

Comments may be posted here on the FITSBITS mail exploder or the
sci.astro.fits newsgroup. Minor typographical issues may be sent
directly to the authors of the convention.

Bill Pence
(on behalf of the IAU FITS Working Group)
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Dr. William Pence
NASA/GSFC Code 662 HEASARC +1-301-286-4599 (voice)
Greenbelt MD 20771 +1-301-286-1684 (fax)
  #2  
Old November 15th 07, 12:25 PM posted to sci.astro.fits
LC's NoSpam Newsreading account
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Posts: 3
Default [fitsbits] Start of the FITS Euro3D Public Comment Period

On Fri, 9 Nov 2007, William Pence wrote:

Comments may be posted here on the FITSBITS mail exploder or the


While the value of this format is undoubted, and the document is rather
clear, there are a number of little inconsistencies or clarifications
required here and there.


*) section 3.1 (primary header) requires the use of EXTEND and EPOCH
(alongside with EQUINOX). The former is no longer mandatory in the
draft standard 3.0, but the latter is deprecated already in the
current standard (in favour of EQUINOX)

*) the list of columns in section 3.1 gives data types in verbose
form (e.g. long integer). It would help to have HERE also the TFORMn
code (e.g. 1J)

*) pag. 10 column 2 (flag). In cases where this column is identically
TRUE could it be collapsed in a keyword according to the Greenbank
convention ?

*) pag. 10 columns 4-5. The "decision" described to "avoid heaps"
rules out TFORMn='nP'. Is this mandatory or just a recommendation ?

*) pag. 11 columns 10-11-12. If the spectrum is shorter than the max
length, what is the content of the unused part of the array ?
This is not defined contrary to columns 6,7,8,9 which use NaN.

*) is there any keyword which gives the max length, other than reading
the "r" in TFORM10='r?' TFORM11='rJ' TFORM12='r?' ?

*) section 4.2 4.3 etc. are given in descriptive (example) rather than
prescriptive form

*) why are XPOS and YPOS rD ? I'd expect rJ

*) 4.5 CUNITS is "unique and applies to all spectra including science,
data quality and statistical error spectra". While it is obvious to
me that the real spectra and its errors are in the same physical flux
unit (some erg/cm2/s/A or whatever), I fail to see how the data
quality can be expressed in flux units (in fact see also 4.6, and
also the last bullet in 4 at pag.8).

In general it is not understood why CUNITS is not just replaced
by the more standard TUNIT10 and TUNIT12 (or even just TUNIT10 with
the implied provision that column 12 has the same units)

*) 5.2 TFORM1='1B' is described as signed 8 bit integer, but according
to FITS standard B is unsigned !

*) 5.2 TFORM1='1A'. Does this imply only the first character of
Square Rectang Hexagon Circle is used ? Or should it be nA, n TBD ?

*) 5.3 example : NAXIS1=34 does not match the sum of the TFORMn !
*) appendix A : here too NAXIS1 does not match the sum of the TFORMn !
*) 4.4.1 : here too NAXIS1 does not match the sum of the TFORMn !
I suggest the author checks *ALL* values of NAXIS1 !

Lucio Chiappetti

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