Geography Reference
In-Depth Information
Generalization is important to make
sure that maps can be correctly used.
From Amair Chaudry, University of Edinburgh, private
communication.
are nearby (e.g., buildings belonging to one factory). A potential conse-
quence of aggregation is that detailed characteristics can be lost, important
relationships homogenized away, or misleading presentations made.
Illustration of aggregation operation.
DISPLACEMENT
Displacement involves changing the position of points, lines, or areas to
either clarify important characteristics, to avoid conf lict with other features,
or to resolve clutter. It is commonly used for emphasizing the relationship of
roads to other features on small-scale transportation maps. Because it results
in changes to the positions of things and events, GI collected from small-
scale maps needs to be carefully verified against larger scale GI for the same
area. The potential distortion of actual geographical relationships should be
taken into consideration when working with any map or visualization.
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