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Navigating the Technological Revolution of Distributed Data and Its Cartographic Challenges

This presentation by Sverre Iversen from the Geological Survey of Norway, delivered at the ICC 2003 in Durban, explores the advancements and difficulties surrounding distributed data applications. It discusses the functionality and challenges of Web Map Services (WMS) within national geo-portals like GeoNorway, highlighting issues such as cartographic design and user interpretation. Furthermore, the need for shared geo-data infrastructure and a database-driven approach for composite maps are emphasized, pointing to future developments in the field.

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Navigating the Technological Revolution of Distributed Data and Its Cartographic Challenges

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  1. Distributed data – one application A technological revelation, but a cartographic nightmare? Sverre Iversen, Geological Survey of Norway ICC 2003,Durban, South Africa (Bunntekst)

  2. Contents • About us • Application development • WMS – what and how • National Geo-portals • Cartographic challenges • Conclusions & outlook • Our WMS page

  3. About us- www.ngu.no • Located in Trondheim • Spreading knowledge on nature resources. • Building national databases for geology. • Applied research and development

  4. Application development- alteration of code

  5. Application development- Survey libraries • General functionality • Menu functionality • URL argument functionality • WMS functionality • Language functionality • Application specific functionality • Map merging and attribute display control

  6. WMS – what and how- fundamentals Foreground map Map Image Map Image Background map 3 types of requests: • GetCapabilities: Request to see what the map service can offer. • GetMap: Request that gives us a map image with one to many themes . • GetFeatureInfo: Request to see attributes for one or several themes at a given coordinate. The map images can be transparent and several map requests (GetMap) can constitute a composite map with several image layers.

  7. WMS – what and how- libraries Libraries for easy definition of: • Adaptable Map Services and themes • Composite maps and legends • XSL attribute display control • Language Contains functionality for: • Map image display order • Visibility of themes • Print out layout • Status reports and Meta Data

  8. National Geo-portals- shared infrastructure Web pilots National Geo-portals • GeoNorway (GeoNorge) • Geohazards online • Water resources • AREALIS – environmental and land use A Web Portal is a Website that offers carefully collated information and services from a variety of fields to satisfy the needs of a particular user group.

  9. National Geo-portals- GeoNorway (GeoNorge) National Geo-portals • Data and information from private and public sector. • The pioneer project. www.geonorge.no

  10. The Mapping Authority- GeoNorway applications National Geo-portals • Register Service name and URL • Register additional information • Generic client for visualisation of registered map services

  11. The Geological Survey- GeoNorway application I National Geo-portals • Shows possible area conflicts • 12 image layers from 3 data providers • 5 different Map Presentations www.ngu.no/kart/natur

  12. The Geological Survey- GeoNorway application II National Geo-portals • Generic and bilingual • Exposes all functionality from WMS library • Buttons for Services, Layer, Theme and Query

  13. The Geological Survey- GeoNorway application functions National Geo-portals

  14. The Geological Survey- GeoNorway attribute display National Geo-portals Servlet filtering - design control: • Table • URL redirect

  15. National Geo-portals- Geohazards online National Geo-portals • Landslide and snow avalanche www.skrednett.no

  16. The Geological Survey- Geohazards online application National Geo-portals • 11 image layers from 5 data providers • 5 different Map Presentations • Bilingual www.ngu.no/kart/geohazards

  17. The Geological Survey- Water resources application National Geo-portals • 11 image layers from 4 data providers • 6 different Map Presentations www.ngu.no/kart/dev/bronndatabasen

  18. National Geo-portals- AREALIS National Geo-portals • Environmental and land use Services www.statkart.no/arealis

  19. The Geological Survey- AREALIS application National Geo-portals • Generic client • 34 image layers from 6 data providers • 27 different Map Presentations www.ngu.no/kart/arealis

  20. Cartographic challenges- dangers and limitations • Isolated cartography can be useless when combined. • WMS images cannot be partly transparent. • Fuzzy transition between non-transparent and transparent areas. • The chosen transparent colour can make objects with near colours transparent too. ArcIMS WMS

  21. Cartographic challenges- presentation in different contexts • have a main cartography for isolated use • prepare cartography for every main context • prepare a simplified cartography for more general use in more dynamic contexts. • or - let the user symbolise the data freely Data that are not intuitively recognisable from context to context can be a nightmare to the user.

  22. Cartographic challenges- documentation Target group Web application Composite maps Data servers

  23. Conclusions & outlook • A shared Geo-Data infrastructure is more common now. • WMS is easy to implement and meets the demands of most users. • Geo-portals and composite maps are difficult to design. • A need for a database driven approach: Storage of functionality and cartographic rules for (dynamic?) composite maps. • WFS will be implemented, but only to a limited extent.

  24. Our WMS page • Applications • WMS request examples • Tips & tricks • Info & presentations www.ngu.no/kart/wms

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