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1.6. Glossary

Adaptive Zooming:
A zooming is called adaptive when the representation of a screen map is adapted to the zoom level. Therefore for each zoom level, the quality of the map is always high and the cartographic principles are conformed. Hence, adaptive zooming describes the adjustment of a map, its contents and the symbolization to target scale in consequence of a zooming operation (=scale change). (Brühlmeier 2000)
Bézier Curve:
A mathematical curve that describes a vector path.
Feature Class:
A feature class is used to define a class of geographic items having the same basic set of characteristics. All features have a topology type of Polygon, Line or Point. Some examples of feature class are Bridge, Road, Lake. A "feature" differs from a "feature class" in that the feature is an instance of feature class. For example "Lake" is a feature class. The feature class "Lake" (and associated data) describes the standards to which all lakes are captured.
Gamma is the curve that describes how the middle tones of images appear on a computer. Changing the value of the gamma affects the mid-tones while leaving the whites and blacks unaltered. (Apple Computer Inc. 2001)
GIS (Geographic Information System):
"A system of mapping software that integrates the collection, management and analysis of geographic data. This can be used to display the results of data queries as maps and analyse spatial distribution of data." (Quartix)
Level of Detail (LoD):
LOD or Level of Detail means that in maps with adaptive zooming the objects are available at different scale levels. Thus, the details of a map are decreased when you zoom out and increased when you zoom in.
"Scalable Vector Graphics (SVG) is an XML markup language for describing two-dimensional vector graphics, both static and animated." (Wikipedia)

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