Distributed data – one application - PowerPoint PPT Presentation

A technological revelation, but a cartographic nightmare?

Sverre Iversen, Geological Survey of Norway

ICC 2003,Durban, South Africa

(Bunntekst)

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

• Located in Trondheim
• Spreading knowledge on nature resources.
• Building national databases for geology.
• Applied research and development

• General functionality
• Menu functionality
• URL argument functionality
• WMS functionality
• Language functionality
• Application specific functionality
• Map merging and attribute display control

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.

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

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.

National Geo-portals

• Data and information from private and public sector.
• The pioneer project.

www.geonorge.no

National Geo-portals

• Register Service name and URL
• Register additional information
• Generic client for visualisation of registered map services

National Geo-portals

• Shows possible area conflicts
• 12 image layers from 3 data providers
• 5 different Map Presentations

www.ngu.no/kart/natur

National Geo-portals

• Generic and bilingual
• Exposes all functionality from WMS library
• Buttons for Services, Layer, Theme and Query

National Geo-portals

National Geo-portals

Servlet filtering - design control:

• Table
• URL redirect

National Geo-portals

• Landslide and snow avalanche

www.skrednett.no

National Geo-portals

• 11 image layers from 5 data providers
• 5 different Map Presentations
• Bilingual

www.ngu.no/kart/geohazards

National Geo-portals

• 11 image layers from 4 data providers
• 6 different Map Presentations

www.ngu.no/kart/dev/bronndatabasen

National Geo-portals

• Environmental and land use

Services

www.statkart.no/arealis

National Geo-portals

• Generic client
• 34 image layers from 6 data providers
• 27 different Map Presentations

www.ngu.no/kart/arealis

• 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

• 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.

Target group

Web

application

Composite maps

Data

servers

• 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.

• Applications
• WMS request examples
• Tips & tricks
• Info & presentations

www.ngu.no/kart/wms