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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.
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MIZAR : space in the pocket Fabien Lavignotte Telespazio CNES Jean Christophe Malapert San Sebastien, 21 june 2013
Summary 1 Context 2 MIZAR presentation 3 Technicaldetails
Asteroiddetection (by temporal comparison or by superimposing a referencecatalog)
How to aggregate information comingfromdifferent data providers Images Instrument Footprints Object catalogs Spectra
Why a webGL application ? Web : High accessibility, connectfromeverywhere 3D : A globe => no distortionat pole webGL : Use of graphicalcard power
Summary 1 Context 2 MIZAR presentation 3 Technicaldetails
Mizar MIZAR • Module for Interactive viZualization in AstronomicalRepositories http://sitools2.sourceforge.net/ Release date : December
Mizar’sfeatures Browsing Background Images Queryform « survey » coverage& intersection CSP & SIAP Use itsown information services Configuration Open source
Summary 1 Context 2 MIZAR presentation 3 Technicaldetails
GlobWeb • Virtual globe in WebGL3D • Developed by TPZF as a R&D project • Licence LGPLv3 • https://github.com/TPZF/GlobWeb
GlobWeb for astronomical data «AstroWeb » • « Inside » the virtual globe • Same algorithmes but… • Specifictiling for astronomical data • HEALPix
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
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 HEALPixtile • Bucket to batch points and polygons sharing the same style
Managing data volumetry • Point clustering • Given a data distribution • MOC • Multi-Ordercoverage
Display astronomical image • FITS • Flexible Image Transport System • ASCII header + binary data • High dynamic range data • Float support needed • Basic tonemapping (Linear, Log) • zScaleused in astronomy
GlobWeb : architecture • Base class
GlobWeb : architecture • Base class
GlobWeb usage Usage • PlanetObserverdemonstration • ESA prototype : EoliWebGL • MIZAR • ESA ngEO • InterAtlasdemonstration