New PDF release: Advances in Geoinformatics: VIII Brazilian Symposium on

By Clodoveu A.D. Jr. Davis, Antonio M.V.M. Monteiro

ISBN-10: 3540734139

ISBN-13: 9783540734130

ISBN-10: 3540734147

ISBN-13: 9783540734147

The GeoInfo sequence of medical meetings is an annual discussion board for exploring examine, improvement and leading edge purposes in geographic info technology and comparable parts. This e-book presents a privileged view of what's at the moment taking place within the box of geoinformatics, and a preview of what may be the warmer advancements and learn themes many years from now. also, it comprises fresh study effects on spatial databases, spatial ontologies, computational geometry and visualization for geographic info platforms, geostatistics and spatial records, spatial research, interoperability, and leading edge functions of geotechnologies.

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Extra info for Advances in Geoinformatics: VIII Brazilian Symposium on Geoinformatics, GEOINFO 2006, Campos do Jordão (SP), Brazil, November 19-22, 2006

Sample text

Finally, using the fragments, the resulting polygons are built considering the desired operation (union, intersection or difference). It is important to notice that the first step in this process involves database query operations and so, it can take a long time; mainly if the two maps have many polygons with many intersections, for example, overlaying two thematic maps of a same region. Furthermore, a same polygon can be processed more than one time. For each polygon Pi used by TeOverlay, a same polygon can be identified as a candidate to intersect Pi.

Each event triggers a set of operations. In this implementation, an event is represented by a point and the segment(s) associated to that point. For each event associated to a point p, there are three lists of segments (see Figure 2): 1. Left segments list: contains the segments that are on the left of p, that is, whose right extreme is p; 2. Right segments list: contains the segments that are on the right of p, that is, whose left extreme is p; 3. Intersections segments list: cointains the segments whose intersection point is p.

Every intersection point obtained in this process is inserted in the list E and also in another list that will contain all the intersection points. For sake of efficiency, the list of segments L is managed as a Red-Black Tree [3] to allow that the neighbors of a segment can be retrieved efficiently. It is important to observe that, in the implementation of this algorithm, there are some special situations (degenerated cases) that have to be treated separately and, in general, they require a considerable effort.

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Advances in Geoinformatics: VIII Brazilian Symposium on Geoinformatics, GEOINFO 2006, Campos do Jordão (SP), Brazil, November 19-22, 2006 by Clodoveu A.D. Jr. Davis, Antonio M.V.M. Monteiro


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