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Distributed data – one application. A technological revelation, but a cartographic nightmare? Sverre Iversen, Geological Survey of Norway ICC 2003, Durban, South Africa. Contents. About us Application development WMS – what and how National Geo-portals Cartographic challenges

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Distributed data one application l.jpg
Distributed data – one application

A technological revelation, but a cartographic nightmare?

Sverre Iversen, Geological Survey of Norway

ICC 2003,Durban, South Africa

(Bunntekst)


Contents l.jpg
Contents

  • About us

  • Application development

  • WMS – what and how

  • National Geo-portals

  • Cartographic challenges

  • Conclusions & outlook

  • Our WMS page


About us www ngu no l.jpg
About us- www.ngu.no

  • Located in Trondheim

  • Spreading knowledge on nature resources.

  • Building national databases for geology.

  • Applied research and development


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Application development- alteration of code


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Application development- Survey libraries

  • General functionality

  • Menu functionality

  • URL argument functionality

  • WMS functionality

  • Language functionality

  • Application specific functionality

  • Map merging and attribute display control


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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.


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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


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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.


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National Geo-portals- GeoNorway (GeoNorge)

National Geo-portals

  • Data and information from private and public sector.

  • The pioneer project.

www.geonorge.no


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The Mapping Authority- GeoNorway applications

National Geo-portals

  • Register Service name and URL

  • Register additional information

  • Generic client for visualisation of registered map services


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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


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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


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The Geological Survey- GeoNorway application functions

National Geo-portals


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The Geological Survey- GeoNorway attribute display

National Geo-portals

Servlet filtering - design control:

  • Table

  • URL redirect


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National Geo-portals- Geohazards online

National Geo-portals

  • Landslide and snow avalanche

www.skrednett.no


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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


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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


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National Geo-portals- AREALIS

National Geo-portals

  • Environmental and land use

Services

www.statkart.no/arealis


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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


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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


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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.


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Cartographic challenges- documentation

Target group

Web

application

Composite maps

Data

servers


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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.


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Our WMS page

  • Applications

  • WMS request examples

  • Tips & tricks

  • Info & presentations

www.ngu.no/kart/wms


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