Simple Spectral Access use cases

Mon Jun 30 05:56:06 PDT 2003

Dear Doug,

there was a small typo in one of the URLs in my previous missage. Please
use this instead.

Here you have our 1-D spectral data as provided by our Archive
 Scientists:

 XMM-Newton 1D Scpectral Data
 ----------------------------

      - Data provider name
         ESA XMM-Newton Science Data Archive

      - Spectral data collections from this source
 	1. automatic pipeline high-resolution spectra for the Reflection
            Grating Spectrometer (RGS) instrument
 	2. medium resolution European Photon Imaging Camera (EPIC)
	   spectra for each source of the XMM-Newton Serendipitous
	   Source Catalogues, both automatically (pipeline) and
	   interactively (XSA user interface) produced 

      - Characteristics of data (number of spectra, size, irregularly
         sampled,nonsampled (as in HE/UV) multiple flux arrays,
         variance arrays, etc.)

 	1. 
 	* Number of spectra (at the end of the mission): ~20000
  	* Size: ~50 KBytes each, ~4096 spectral channels, uniformly and
 		  linearly sampled in energy
  	* Resolution: 200-800, in the energy range 0.35-2.5 keV
  	* Data structure: 1-D spectra in CHANNELS/COUNTS
  	* Type of data: background subtracted source and background
 		  spectrum for the 1st and 2nd order. Spectra are **not** in
 		  physical units, and need an observation dependent transfer
 		  matrix(available through the XMM-Newton pipeline products) to
 		  be analyzed. Fluxed spectra in physical units available as
 		  well, but not usable for quantitative science analysis.

 	2. 

  	* Number of spectra (at the end of the mission): ~1500000
  	* Size: ~30-200 KBytes each, 800-4096 spectral channels,
 		  uniformly and linearly sampled in energy
  	* Resolution: 20-50, in the energy range 0.35-15 keV
  	* Type of data: source and background spectrum. Spectra are
 		  **not** in physical units, and need an observation dependent
 		  transfer matrix(**not** available through the XMM-Newton
 		  pipeline products) to be analyzed. Plan to provide fluxes
 		  spectra in physical units under study * Data structure: 1-D
 		  spectra in CHANNELS/COUNTS * Tables: fluxes (in 5 different
 		  energy bands), hardness ratios for each individual source

      - Current data storage format
         FITS

       - Is the data available online?
         Yes:
         a) Through a User Interface at:
            http://xmm.vilspa.esa.es/xsa/
         b) Through HTTP directly at:
            http://xsa.vilspa.esa.es:8080/aio/doc/   

       - Other comments

 ISO 1D Spectral Data
 --------------------

     - Data provider name
         ESA ISO Science Data Archive

       - Spectral data collections from this source
         ISO Data Archive (IDA)

       - Characteristics of data (number of spectra, size, irregularly
         sampled,nonsampled (as in HE/UV) multiple flux arrays,
         variance arrays, etc.)

         ~10,000 files, containing spectra at resolutions ranging
          from 40 to 30,000, in the wavelength range of 2.4 to 197
 	 micron. Irregularly sampled. File size average 700 KB
 	 (compressed).

       - Current data storage format
         FITS

       - Is the data available online?
         Yes:
         a) Through a User Interface at:
             http://www.iso.vilspa.esa.es/ida/
         b) Through HTTP directly at:
           http://pma.iso.vilspa.esa.es:8080/jsp/product.jsp?obsno=<>  

       - Other comments

 Cheers,

 Pedro.

 -- 

 Pedro Osuna Alcalaya

 SOFTWARE Development Group
 XMM-Newton Science Archive				
 e-mail: Pedro.Osuna at esa.int
 Tel + 34 91 8131314  				

 European Space Agency
 VILLAFRANCA Satellites Tracking Station
 P.O. Box 50727 
 E-28080 Villafranca del Castillo
 MADRID - SPAIN

> On Wed, 18 Jun 2003 21:14:28 -0600 (MDT)
> Doug Tody <dtody at nrao.edu> wrote:
> 
> > At the IVOA meeting in Cambridge a few weeks ago, one of the highest
> > priority projects identified for the DAL working group was to define
> > a"simple spectral access" protocol for accessing 1D spectra and
> > SEDs.
> > 
> > To help plan this effort it would help to get a better idea of how
> > such an interface would initially be used.  If you think you or your
> > institution might provide 1D spectral data or SEDs to the VO, or
> > might provide software to use such data provided by the VO (e.g., as
> > an addition to an existing VO demo or by interfacing some analysis
> > application), please fill in the following form and return it to
> > dal at ivoa.net.  Note doing so is not a committment to actually do any
> > work!  We mainly just want to get a better idea of what spectral
> > data collections are out there, to help design the spectral data
> > interface.
> >  Thanks very much for your help with this.
> > 
> > Doug Tody (dtody at nrao.edu), Markus Dolensky
> > (Markus.Dolensky at eso.org)
> > 
> > 
> > Simple Spectral Access Use Cases
> > 
> > Data Providers (e.g., data centers, archives)
> > 
> >     - Data provider name
> > 
> >     - Spectral data collections from this source
> > 
> >     - Characteristics of data (number of spectra, size, irregularly
> >     sampled,
> >       nonsampled (as in HE/UV) multiple flux arrays, variance
> >       arrays, etc.)
> > 
> >     - Current data storage format
> > 
> >     - Is the data available online?
> > 
> >     - Other comments
> > 
> > 
> > Data Consumers (e.g., analysis packages, e.g., VO demonstrations
> > that might want to add the ability to fetch and display a spectrum)
> > 
> >     - Name of application, package, demo, etc.
> > 
> >     - Summarize capabilities of software
> > 
> >     - Desired characteristics of input data
> > 
> >     - Desired input data format or formats (e.g., graphics, FITS,
> >     XML)
> > 
> >     - Other comments
> > 
> > 
> > General Comments 
> > 
> > 
> 
> 
> 

-- 

Pedro Osuna Alcalaya

SOFTWARE Development Group
XMM-Newton Science Archive				
e-mail: Pedro.Osuna at esa.int
Tel + 34 91 8131314  				

European Space Agency
VILLAFRANCA Satellites Tracking Station
P.O. Box 50727 
E-28080 Villafranca del Castillo
MADRID - SPAIN