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1. 1st
intercon+nental
Conference
of
Territorial
Intelligence
IT-Gatineau 2011, Oct. 12-14, 2011
A landscape potential characterization: spatial
template of pedestrian ambient fields within the
urban fabric
P. Woloszyn and T. Leduc
ESO and CERMA Laboratories, CNRS, France
2. Outline
Context and motivations
Visual perception using isovists field
The method we developed
Use case and results
Conclusion and outlook
3. Context and motivations : the socio-ecological transition trade-off
Income
distribu7on
law
Powerty/inequality
measurements
Economical
NEEDS
Social
Entropy
Socioeconomical
weight
Entropy
RESOURCE
DEVELOPMENT
Econogical
weight
Socioecological
weight
Environmental
Entropy
Microambients
economics
4. Focus on visual ambiences : isovists field
The isovist is simply the Gibsonian optic array, with the
wavelength and intensity information omitted,
It describes local geometrical properties of spaces with respect
to individual observation points and weight all the possible view
directions equally. It is a 2D horizontal slice of pedestrian's
surrounding space;
The set of all points in an environment of
opaque surfaces that are visible from a
given view-point;
A useful tool to define the open space
concept (= the empty space, the void,
between the surrounding buildings).
5. Our proposal
Combine:
A sort of “surface ray casting” strategy (an angular abscissa
sampling of the star-shaped isovist),
With a tool from information theory (Shannon entropy),
So as to produce:
A sensory based Digital Terrain Model
6. Some more details
sample the region of interest into a set of punctual
positions
in each of these punctual locations, determine the
corresponding partial isovist
convert all these isovists (2D star shaped polygons) into a
set of function of radial distances (dimension reduction
operation)
let's assume that each function of radial distances
represent a 1D random variable, and compute the
corresponding Shannon entropy value
represent all these entropy values into a raster color map
7. Function of radial distances and
dimension reduction operation
Nyquist–Shannon
sampling theorem
Shannon entropy
computation
14. Conclusion and outlook
Done
- landscape visual space geo-topical modeling
- angular perspective variability computation
- spatial potential, allowing a pedestrian to diversify his
visual landscape during his walk
- advanced overview of the complexity and the richness
of the urban fabric
Future
Challenge is to investigate the inter-sensorial ambient-
scape as a basis of a multi-sensory conception in
townscape planning and design
15. Acknowledgements
To:
F Gonzalez Cortés (Spain) for all the developments
performed on the GearScape GIS.
And to:
Assistant Professor B Suner (from the National School
of Architecture of Nantes city, France) for his significant
help in the production of the panoramic snapshots.