mizar : space in the pocket
DESCRIPTION
MIZAR : space in the pocket. Fabien Lavignotte. Telespazio. CNES. Jean Christophe Malapert. San Sebastien, 21 june 2013. Summary. 1. Context. 2. MIZAR presentation. 3. Technical details. Context. Use case : Data quality. - PowerPoint PPT PresentationTRANSCRIPT
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MIZAR : space in the pocket
TelespazioCNES
San Sebastien, 21 june 2013
Fabien LavignotteJean Christophe Malapert
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Summary
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Context1
Technical details
2 MIZAR presentation
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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 everywhere3D : A globe => no distortion at polewebGL : Use of graphical card power
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Summary
3
Context1
Technical details
2 MIZAR presentation
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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
CSP & SIAPUse its own information
Query form
« survey » coverage & intersection
Configuration Open sourceservices
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Summary
3
Context1
Technical details
2 MIZAR presentation
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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
Globe
TileManager
TileRequest
RenderContext HEALPixTiling
HEALPixTileTilePool
HEALPixLayerNavigation
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GLOBWEB : ARCHITECTURE
Base class
Globe
TileManager
TileRequest
RenderContext GeoTiling
GeoTileTilePool
WMSLayerNavigation
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GLOBWEB USAGE
Usage
PlanetObserver demonstration
ESA prototype : EoliWebGL
MIZAR
ESA ngEO
InterAtlas demonstration
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Questions ?