POINT DATA
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Defined as a single x,y cordinate used to describe a geographic feature.
the point is the simplest type of spatial object.
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Choice of entities which are represented as points depends on the scale
of the map/study. on a large scale (small area) maps building can be encoded
as point locations. On a small scale map (large area) cities can be encoded
as point locations.
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Iinformation on a set of points can be stored in an attribute table.
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Each row in the attribute table relates to one point.
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each column is an attribute
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Each point is independent of every other point, represented as a separate
row in the database model.
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Points can represent two generic types of features in a GIS. The first
is a point feature which represents the actual geographic location of a
feature, the second is a label point which resides within a polygon to
provide attribute information. A label point does not represent the location
of a geographic feature, it represents the polygon within which it resides.
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Go back to GER home pageAuthor: R. Douglas Ramsey Doug@nr.usu.edu