things have changed, a visual assessment of a virtual landscape … · 2011-07-19 · henk kramer...
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Henk Kramer
Things have changed, a visual assessment of a virtual landscape from 1900 and 2006
Henk Kramer, Joske Houtkamp and Matthijs Danes
Henk Kramer
Things have changed, a visual assessment of a virtual landscape from 1900 and 2006
Introduction Why this research?
Scope of the research and result What did we want to do and what not Method The first result, two virtual landscapes and one movie User feedback
Conclusion
Henk Kramer
Introduction : why this researchOld paintings:
They show a glimps of the bygone landscape
Source: http://verdwenennederland.bosatlas.nl
Posbank,
veluwe 1916
Henk Kramer
Introduction : why this researchAnd show the changes in the landscape
Source: http://verdwenennederland.bosatlas.nl
Posbank, veluwe 1916
Posbank, veluwe 2006
Henk Kramer
Introduction : why this researchBut paintings are fixed views and limited to a handful of locations
Source: http://verdwenennederland.bosatlas.nl
Henk Kramer
Introduction : why this researchBut it’s relatively easy to see what has changed
Source: http://verdwenennederland.bosatlas.nl
Posbank, veluwe 1916
Posbank, veluwe 2006
Henk Kramer
Introduction : why this research
More views and locations can be made available by creating 3d virtual landscapes from historical and current topographic maps.
Nation wide topographic maps for The Netherlands are available from 1850 on.
Henk Kramer
Introduction : why this research
Henk Kramer
Introduction : why this research
The main research question:
How do you compare two 3D views from different moments in time to see what has changed.
Henk Kramer
Introduction : why this research
Henk Kramer
Scope of the research
We wanted to:
• create comparable 3d environments for two timeslots
• based on topographic maps
• with the same level of abstraction
• easy access to users
• and with a focus on the changes in the landscape
Henk Kramer
Scope of the research
We did not want to:
• create a historical sensation
• use photo-realistic rendering
Henk Kramer
Scope of the research
Software:
• ArcMAP for pre-processing GIS data
• Landsim3D for constructing 3D environment and rendering
• Avisynth for post-processing rendered movies
Website for presenting results for evaluation
Henk Kramer
Result
Website : http://alterra0125s.wur.nl/gpsvid/tndt.htm
Henk Kramer
Result
Geometric differences; changes or errors?
One important factor when dealing with historical data:
• historic geodetic base not as accurate as the current base
• surveying errors?
• cartographic interpretation, a map is not the real world
Some examples
Henk Kramer
Result Geometric differences; changes or errors?
The road is relocated?
Digitizing error?
Mapping error?
Henk Kramer
Result Geometric differences; changes or errors?
The road is relocated?
Digitizing error?
Mapping error?
What does the user think?
Henk Kramer
User feedback
A questionnaire with a link to the website was send to several prospective users.
Henk Kramer
User feedback
The questions concerned four topics:
• the usability of the visualization
• the functionality of the interface
• the quality of the representation
• how can this be employed in research or education
Henk Kramer
User feedback
the usability of the visualization
Watching 3 animations at the same time is too difficult, so have to stop all the time.
Henk Kramer
User feedback
the functionality of the interface
Required: step by step from one frame to another; afterwards perhaps play the whole animation
For instance: points of interest on map that are clickable
Henk Kramer
User feedback
the quality of the representation
Low quality of rendering distracts, and does not allow experience of historic landscape.
Absence of lighting/shadows
More objects to strengthen the effect of a real landscape in use?
Vegetation is confusing.
Henk Kramer
User feedback
how can this be employed in research or education
Educational (showing to students)
Information in context of museums, nature educational centers
Spatial planning and design, by e.g. policy makers/administrators
Henk Kramer
Conclusions
• it is possible to construct comparable 3D virtual landscapes from historical and recent topographic maps
• presenting two views side by side is a workable method to show the results but the user needs guidance to know where to look
• the graphic quality needs to be improved
• the quality of the vegetation objects needs to be improved
Things have changed, a visual assessment of a virtual landscape from 1900 and 2006
Henk Kramer
Thank you
© Wageningen UR