| 7.2.7 Attribute
database management
In spite of what is frequently
stated, most GIS activities require rather simple data base management
operations (query and retrieval) on the tabular (attribute) data associated
to the geometrical features. However, under some circumstances, users must
dedicate considerable time to the (conceptual and physical) design of the
database.
At the time of GIS project initiation,
some tabular databases may already be available. They need to be properly
linked either to the geometric features of the GIS maps or to existing
GIS related tables. In many circumstances the user can decide to postpone
the acquisition of a large and costly DBMS and use the (small) database
that generally comes with the GIS software.
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Click on the preview
in order to see a larger
version of this photo
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Interesting subjects are
how a GIS accomplishes feature filtering (we see here the checkboxes),
feature symbolization, zooming & panning (the 2nd view on the right
is a zoomed part of the 1st), attribute table editing (see the table lower
left where the user can directly intervene), scaling (notice the small
frame upper right indicating the scale of the view, where we can fill in
a desired scale & and the view will change automatically), etc. |
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