Transcript Press Release Images, Virtual Observatories, and Web Services

Virtual Observatories,
Press Release Images,
and Web Services
Dr. Frank Summers
Space Telescope Science Institute
November 3, 2005
Collaborators
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Lisa Frattare, Zolt Levay
Phil Hodge
Kaushi Bandara
Bob Hanisch, Carol Christian, Nahide
Craig
Virtual Observatories
• Digital data, digital
connections, digital
processing
• Many telescopes, many
repositories, many
bandpasses
• Define standards, build
infrastructure & tools
Press Release Images
• Pictures worth a
thousand words
• VO Problems
– Heavily processed
– No coordinates
– Different metadata
Web Services
• User to computer
• Computer to computer
• XML – self-describing
– DTDs, Schema
– VOTABLE
Simple Image Access
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SIA protocol defines a web service
Input: cone search
Output: list of images
Several types of services: cutout,
mosaic, atlas, pointed
• www.ivoa.net/Documents
PReSS Images
Internet
SIA Info Database
SIA Query Server
NVO Interfaces
Public Interfaces
Major Tasks
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Gather image data, esp WCS
Assemble image database
Create web service
Register with NVO
PReSS Archive
• STScI NewsCenter
database
• Images
• Metadata
– Astro info: object,
category, instrument
– News info: release,
primary, composite
Get WCS Info
• Identify suitable images
• Retrieve FITS files
• Run WCS Transfer Tool
Non-VO Images
Solar system
Print layout
Non-astronomical
Composite
Astronomical
Astronomical w/ notation
FITS & WCS
Process FITS
WCS Transfer Tool
• FITS reference image
• Public release image
• Mark corresponding points
– Automatic peak identification
– Automatic solution refinement
• Python program
– Python imaging lib (PIL)
– Matplotlib
– Tk interface
WCS Results
Create Database
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Loop through WCS processed images
Scan through PReSS
Calculate new quantities
Output assembled data
Perl program
HST PR SIA Web Service
• Perl programs within Apache web server
• Based on SIA 1.0 spec
• Process SIA query
– Uses modified CGI::Validate
• Search database
• Create VOTABLE response
– Uses GSFC’s ASTRO::VO::VOTABLE
– Custom EPO fields
• All code will be available
To Do List
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Multiple image versions
Test to production server
Document & distribute
Pipeline
Other Things
• AAS Astronomy Visualization Session
• Webcasts & Audience
• Einstein Opera