Department of Geo-information Processing possibilities & pitfalls possibilities & pitfalls of web sites for spatial of web sites for spatial data dissemination data dissemination Barend Köbben International Institute for Geo-information Science and Earth Observation (ITC)
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Department of Geo-information Processing possibilities & pitfalls of web sites for spatial data dissemination Barend Köbben International Institute for.
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Department of Geo-information Processing
possibilities & pitfalls of web sites possibilities & pitfalls of web sites for spatial data disseminationfor spatial data dissemination
Barend KöbbenInternational Institute for Geo-information Science
For showing dynamic phenomena As animated maps (‘movies’) (eg. gondwana)
As dynamic real-time images (ANWB)
Department of Geo-information Processing
Dynamic web mapsDynamic web maps
For moving through Virtual Worlds As a view-only animation
(eg. animated GIF)
With an interactive interface (“movie”) (eg. quicktime)
With interactive contents (modelled) (eg. games, VRML)
Department of Geo-information Processing
Web graphics todayWeb graphics today
standardised raster formats: fixed resolution (quality low or files large) original content (“information”) is lost difficult to get interactivity (other than ‘clickable maps’)
binary formats (no searching/indexing of information, no internationalisation)
W3C standardised: GIF, JPEG
non-standard industry (proprietary) formats raster or vector; offering diverse, possibilities
Countless examples, eg: PDF, Flash
Department of Geo-information Processing
Web graphics of the future:Web graphics of the future:
• vector graphics, resolution-independent
• "content" of information saved
• client-side ‘rendering’ -> customisable for viewing environment
• XML-based W3C’s designated backbone for the future Web
Department of Geo-information Processing
XML (eXtensible Markup Language)XML (eXtensible Markup Language)
not a fixed format, but a ‘metalanguage’ —a language for describing other languages—
lets you design your own customized markup languages for limitless different types of documents eg. Geographic Markup Language (GML) - OpenGIS
standard for geographical information written in SGML (the international standard metalanguage for text
markup systems; ISO 8879)
much more than a webpage language useable for storing and exchanging any kind of structured