MIZAR : space in the pocket
Telespazio
CNES
Fabien Lavignotte
Jean Christophe Malapert
San Sebastien, 21 june 2013
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Summary
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Context
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MIZAR presentation
Technical details
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CONTEXT
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USE CASE : DATA QUALITY
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USE CASE : STELLAR EVOLUTION (SPECTRAL ENERGY
DISTRIBUTION)
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USE CASE : STELLAR EVOLUTION (TEMPORAL DETECTION)
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ASTEROID DETECTION (BY TEMPORAL COMPARISON OR BY
SUPERIMPOSING A REFERENCE CATALOG)
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USE CASE : FIND AN OBJECT NAME AND RELATED
PUBLICATIONS
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HOW TO AGGREGATE INFORMATION COMING FROM DIFFERENT
DATA PROVIDERS
Images
Spectra
Instrument Footprints
Object catalogs
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WHY A WEBGL APPLICATION ?
Web : High accessibility, connect from everywhere
3D : A globe => no distortion at pole
webGL : Use of graphical card power
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Summary
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Context
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MIZAR presentation
Technical details
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MIZAR
MIZAR
Module for Interactive viZualization in Astronomical Repositories
http://sitools2.sourceforge.net/
Release date : December
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MIZAR, ITS ARCHITECTURE
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MIZAR’S FEATURES
Browsing
Background Images
Use its own information
« survey » coverage & intersection
services
Configuration
Query form
CSP & SIAP
Open source
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Summary
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Context
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MIZAR presentation
Technical details
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GLOBWEB
Virtual globe in WebGL3D
Developed by TPZF as a R&D project
Licence LGPLv3
https://github.com/TPZF/GlobWeb
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GLOBWEB FOR ASTRONOMICAL DATA
« AstroWeb »
« Inside » the virtual globe
Same algorithmes but…
Specific tiling for astronomical data
HEALPix
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HEALPIX
Map the sphere to 12 base “pixels”
Quadtree subdivision of each base pixel
Properties
Areas of all pixels at a given resolution are identical
Pixels are distributed on lines of constant latitude
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GLOBWEB FOR ASTRONOMICAL DATA
Observations
Points or polygons
Received as GeoJSON
High data volumetry :
Thousand of visible observations
Automatic batch of points and polygons per HEALPix tile
Bucket to batch points and polygons sharing the same style
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MANAGING DATA VOLUMETRY
Point clustering
Given a data distribution
MOC
Multi-Order coverage
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DISPLAY ASTRONOMICAL IMAGE
FITS
Flexible Image Transport System
ASCII header + binary data
High dynamic range data
Float support needed
Basic tone mapping (Linear, Log)
zScale used in astronomy
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GLOBWEB : ARCHITECTURE
Base class
Navigation
RenderContext
TilePool
Globe
HEALPixLayer
TileManager
HEALPixTiling
TileRequest
HEALPixTile
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GLOBWEB : ARCHITECTURE
Base class
Navigation
RenderContext
TilePool
Globe
WMSLayer
TileManager
GeoTiling
TileRequest
GeoTile
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GLOBWEB USAGE
Usage
PlanetObserver demonstration
ESA prototype : EoliWebGL
MIZAR
ESA ngEO
InterAtlas demonstration
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Questions ?
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