Sampo Team

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Using ESO Reflexto access astronomical
WebServices
byThe Sampo Team
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In this demo we will show you an example of Web
Services used by ESO Reflex . Here you find an
ESO Reflex workflow ... and three Web Services
Sesame Name Resolver MAST archive WESIX
source identification database Lets move on ...
Simbad / NED / VizieR
Sesame Name Resolver
CDS XML Web Services server Centre de Données
astronomiques de Strasbourg
The Multimission Archive at STScI (MAST)
MAST
WESIX
Web Enabled Source Identification with X-matching
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User wants to find Hubble information about
NGC1365. We have two input parameters.
NGC1365 - The name of the object. sexconf
a configuration file for the image analysis
package SExtractor run by the WESIX service.
Simbad / NED / VizieR
Sesame Name Resolver
CDS XML Web Services server Centre de Données
astronomiques de Strasbourg
NGC1365
sexconf
The Multimission Archive at STScI (MAST)
MAST
WESIX
Web Enabled Source Identification with X-matching
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Lets send those parameters to appropriate
processors. The sesame-processor sends a request
to the Sesame name resolver service which in turn
is using Simbad, NED and VizieR databases. The
idea is to find the location of the requested
object NGC1365.
Now the sesame processor know the values of the
RA Dec of NGC1365. We split the response using
local Java widgets XPath_ra and XPath_dec. The
MASTSIAP processor will use those values.
...POS53.4,-36.14...
Simbad / NED / VizieR
Sesame Name Resolver
CDS XML Web Services server Centre de Données
astronomiques de Strasbourg
Get infoNGC1365
NGC1365
sexconf
The Multimission Archive at STScI (MAST)
MAST
WESIX
Web Enabled Source Identification with X-matching
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MASTSIAP is a subworkflow which is using MAST
service to get a VOTable of FITS file URLs and
other metadata. Lets make a request using SIAP
protocol The VOTable is shown to the user
through VOTableviewer processor inside MASTSIAP.
At this stage the user has a free choice to
select data sets of interest from the list
returned from MAST.
Simbad / NED / VizieR
Sesame Name Resolver
POS53.4,-36.14
The Multimission Archive at STScI (MAST)
ra53.4
dec-36.14
Simple Image Access Protocol (SIAP)
ra53.4,dec-36.14?
MAST
ltVOTablegt
WESIX
Web Enabled Source Identification with X-matching
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A Plastic Hub is used to transfer the URL of the
selected FITS file to the Aladin software using
the urlviapalstictoAladin processor. To get a
catalog for the selected picture request is send
to WESIX service.
The WESIX processor save the received catalog to
local file and send name of the file to
Aladin via PLASTIC.
Aladin reads the local catalogue file ... ...
and makes a new request to the MAST service in
order to get the actual FITS image. The combined
image and overlayed catalogue is shown in the
work space of the Aladin. One more time ...
Simbad / NED / VizieR
Sesame Name Resolver
CDS XML Web Services server Centre de Données
astronomiques de Strasbourg
The Multimission Archive at STScI (MAST)
MAST
url fits
url fits
Get catalog for url fits
FITS for url fits
Send url fits to Aladin
Catalog
Catalog for url fits
Send ltfilenamegt to Aladin
WESIX
Web Enabled Source Identification with X-matching
ltfilenamegt from Reflex
Get FITS for url fits
PLASTIC is a protocol for communication between
client-side astronomy applications
url fits from Reflex
Jatkuu
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Authors

• Pekka Järveläinen (CSC - Scientific Computing
  Ltd)
• Tero Oittinen (Observatory, University of
  Helsinki)
• Richard Hook (ST-ECF / ESO)
• Sami Maisala (Observatory, University of
  Helsinki)
• Marko Ullgrén (Observatory, University of
  Helsinki)
• Ville Savolainen (CSC - Scientific Computing Ltd)

Jatkuu