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

The GeoInfo sequence of medical meetings is an annual discussion board for exploring study, improvement and cutting edge purposes in geographic details technology and comparable parts. This publication offers a privileged view of what's at present 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 learn effects on spatial databases, spatial ontologies, computational geometry and visualization for geographic details platforms, geostatistics and spatial records, spatial research, interoperability, and leading edge purposes of geotechnologies.

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

Example text

Notice that p1 is on the wrong side with respect to both subpolylines, but with respect to P and P' it is on the correct side. We formalize the consistency for linear features as follows. Let P be a polyline, P' be a simplified version of P, and F be a set of vertices of linear features. The polylines P and P' are said to be consistent with respect to F, if the polygons formed by each subpolyline Pij and its correspondent line segment vivj contain no element of F. Figure 9(c) illustrates an example of consistent simplification (a) (b) (c) Fig.

The sidedness of these features is computed with the parity rule. Fig. 12. Correction step of Saalfeld’s algorithm: selecting features inside the convex hull, and computing and updating their sidedness classification. 10 A. C. G. -T. Wu After the initialization, for each subpolyline Pij that has features on the wrong side, the algorithm breaks its correspondent line segment vivj by adding the farthest vertex vk. It updates the sidedness classification of the external points in the current convex hull, using the triangle inversion property.

A set point triangulation consists on finding straight line segments that connect these points so that: (1) none of these segments crosses with another straight line segment, and; (2) each point is vertex of at least a triangle formed by these segments (or a minimum of two triangles when considering the convex hull). Thus, to compute the Figure 1 mesh, it is necessary to work out the surface head point’s triangulation. This triangulation resulted in the collection of triangles observed in the same figure.

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