|Mittagsseminar Talk Information|
Date and Time: Wednesday, July 06, 2005, 12:15 pm
Duration: This information is not available in the database
Location: This information is not available in the database
Speaker: Bettina Speckmann (TU Eindhoven)
On Rectangular Cartograms
A rectangular cartogram is a type of map where
every region is a rectangle. The size of the
rectangles is chosen such that their areas
represent a geographic variable (e.g., population).
Good rectangular cartograms are hard to generate:
The area specifications for each rectangle may
make it impossible to realize correct adjacencies
between the regions and so hamper the intuitive
understanding of the map.
We present the first algorithms for rectangular
cartogram construction. Our algorithms depend on
a precise formalization of region adjacencies and
build upon existing VLSI layout algorithms.
Furthermore, we characterize a non-trivial class of
rectangular subdivisions for which exact
cartograms can be computed efficiently. An
implementation of our algorithms and various
tests show that in practice, visually pleasing
rectangular cartograms with small cartographic
error can be generated effectively.
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