By Clodoveu A.D. Jr. Davis, Antonio M.V.M. Monteiro
The GeoInfo sequence of medical meetings is an annual discussion board for exploring learn, improvement and leading edge functions in geographic details technology and similar parts. This ebook 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 study subject matters many years from now. also, it comprises contemporary examine effects on spatial databases, spatial ontologies, computational geometry and visualization for geographic details platforms, geostatistics and spatial information, spatial research, interoperability, and leading edge functions of geotechnologies.
Read Online or Download Advances in Geoinformatics: VIII Brazilian Symposium on Geoinformatics, GEOINFO 2006, Campos do JordÃƒÂ£o (SP), Brazil, November 19-22, 2006 PDF
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Extra info for Advances in Geoinformatics: VIII Brazilian Symposium on Geoinformatics, GEOINFO 2006, Campos do JordÃƒÂ£o (SP), Brazil, November 19-22, 2006
A) (b) (c) (d) (e) (f) Fig. 13. Failure in Saalfeld’s algorithm. Consistent Handling of Linear Features in Polyline Simplification 11 Observe, from Figure 13(c), that the triangle inversion property is equivalent to the point consistency strategy of de Berg et al.. However, Saalfeld’s algorithm adds more vertices to the simplified polyline, due to its independent treatment of distinct subpolylines. Nevertheless, his algorithm is not yet able to remove all intersections. 2 Update of Sidedness Classification Our strategy is based on the fact that the relationship between a feature and the original polyline never changes throughout the course of the simplification.
From line 08, a crossing is found when (1) the subpolyline changes its side with respect to the ray (currSide and prevSide are different) and (2) f is below the current line segment. Observe, in line 09, that the algorithm first stores the indices in a linked list. This is because, before processing, it does not know the number of crossings. After the computation, the content of the list is finally copied to the array, for which enough memory has been allocated (line 13). Since the search for crossings is done from i+1 to j (line 06), the indices of the crossed line segments are stored in ascending order.
The Terralib library is composed by many modules and, as any other GIS, it has a geometrical module that is responsible for giving support to geometric operations required by other GIS modules. Certainly, among these geometric operations, one of the most important is the overlay of two maps [1, 5, 11, 12]. As it is known, the map overlay is used in many situations when it is necessary to combine or to compare data stored in distinct information layers. For example, consider the following operation: “determine the deforestation areas inside indian reserves”.
Advances in Geoinformatics: VIII Brazilian Symposium on Geoinformatics, GEOINFO 2006, Campos do JordÃƒÂ£o (SP), Brazil, November 19-22, 2006 by Clodoveu A.D. Jr. Davis, Antonio M.V.M. Monteiro