interactive access and visualization of 3d geographic ... · interactive access and visualization...

Interactive Access and Visualization of 3D Geographic Information in the World Wide Web


Volker Coors

13-Dec-97

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Table of Contents


Introduction and Overview

Why using the WWW as a 3D-GIS front end ?

Problems and Requirements

State of the Art

Author: Christine Giger

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System Architecture of GOOVI-3D

Data Transfer

Interactive Data Query

Summary

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State of the Art


State of the Art

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Data Transfer


Data Transfer

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Summary


Summary

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Summary

Summary

GOOVI-3D, a prototype 3D-GIS front-end using WWW

❍ 3D visualization using VRML ❍ interactive data access

fundamental things in GIS context missing in VRML

❍ lack of object management ❍ no database access

extend VRML to geographical purpose

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Two kind of queries

1) What is ...?

❍ selecting an object ❍ obtaining additional information about that object

2) Where is ... ?

❍ search objects which meet specific conditions ❍ highlight the resulting objects

SQL interface in VRML

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Data Transfer

Data Transfer geometry

topology

views

thematic data

1

3

4

...

no object identification in VRML

extend protocol for object management:

objectid toplogical class VRML-description of view

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Data Transfer

Server &Client

2




System Architecture of GOOVI-3DGeo-Objects

3D GIS

Server

WWW Server

CORBA / IDL Interface

GOOVI-3D in

WWW-Browser

GOOVI-3D in

WWW-Browser

IIOP


PPT Slide

PPT SlideState of the Art

static scene ❍ presenting a 3D scene with no further interaction

offline generation ❍ using CGI to get a user specific static 3D scene

3D-retrieval-interface ❍ 3D scene with hyperlinks to other predefined pages

none of these systems can be called interactive GIS front end



PPT Slide

PPT SlideVRML Topographic Map Generator http://evlweb.eecs.uic.edu/pape/vrml/etopo



State of the Art

State of the Art

static scene

❍ presenting a 3D scene with no further interaction

offline generation

❍ using CGI to get a user specific static 3D scene





enormous data amount

❍ WWW has small bandwidth ❍ need of techniques to reduce the amount of data transmitted

individual object presentation

❍ Web pages show data from systems point of view ❍ display data from the users point of view

Interactions

❍ initially WWW and VRML were static ❍ need intuitive way to interact with the model





spread information to a multitude of users

available on several hardware platforms

integrate data from multiple sources

area of applications:

❍ architecture and urban planning ■ from presenting plans up to participatory planning

❍ tourist information ■ route planning, historical sites, virtual museums

❍ etc





advantages and disadvantages of the WWW

state of the art

GOOVI-3D:

architecture for using the WWW as a 3D-GIS front end

propose essential VRML extensions





Dipl.-Inform. Volker Coors

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