BISC Seminar Announcement, Wednesday October 27th, 2-3pm, 606 Soda

Frank Hoffmann (fhoffman@cs.berkeley.edu)
Wed, 27 Oct 1999 01:47:17 +0200 (MET DST)

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Berkeley Initiative in Soft Computing (BISC)
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B I S C S e m i n a r A n n o u n c e m e n t
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Localization Constraints in Schematic and Topographic Maps

and

On the modeling of vague spatial boundaries.


Speakers: Alexander Klippel & Lars Kulik
University of Hamburg, Germany
E-mail: <klippel><kulik>@informatik.uni-hamburg.de

Date: Wednesday, October 27th, 1999
Time: 2-3pm
Location : 606 Soda Hall

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N O T I C E : Different location and date/time
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Abstract

Localization Constraints in Schematic and Topographic Maps

Maps are common means for representing geographic knowledge. To understand
the different possibilities of representing spatial aspects of geographic
knowledge in maps it is useful to juxtapose schematic maps (for example,
underground maps) and general reference maps (i.e. topographic maps). The
content of both map types is derived from the same sources of information.
Despite this similarity in origin, the localization of cartographic
entities in topographic maps is defined by rules, for instance the use of a
certain projection, whereas the need for defined localization is relaxed in
schematic maps. This relaxation of localization constraints in schematic
maps relates to other differences between the two kinds of maps as well.
The formal description of the differences between schematic and topographic
maps enables the evaluation of computational efforts of each map type and
provides a basis for psychological experiments. The first step in formal
description is the characterization of spatial relations in schematic and
topographic maps along the following distinctions: Topology, ordering
information, and metric. This provides distinctive features of the
geometric richness of each map type. Further investigations concerning
reference systems are founded on this initial formal description. We give
an account of the correspondence between geometric characterization of map
types and interpretation principles.

On the modeling of vague spatial boundaries.

There are different theories in GIS concerning the modeling of vague
boundaries of geographic objects. This talk discusses the various
approaches, especially the ones based on mereology and fuzzy set theory.
Their strategies are illustrated and some logical consequences are provided.
I will propose some enhancements and introduce the theory of supervaluation
as an alternative to model vague boundaries.

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Please direct questions with regard to the contents of the talk
and request for papers to the speaker.
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-- 
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Frank Hoffmann                               UC Berkeley
Computer Science Division                    Department of EECS
Email: fhoffman@cs.berkeley.edu              phone: 1-510-642-8282
URL: http://http.cs.berkeley.edu/~fhoffman   fax:  1-510-642-5775
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