By Clodoveu A.D. Jr. Davis, Antonio M.V.M. Monteiro
The GeoInfo sequence of clinical meetings is an annual discussion board for exploring examine, improvement and cutting edge functions in geographic info technological know-how 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 issues 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 facts, spatial research, interoperability, and cutting edge purposes 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
The polygons candidates are determined connecting to the database manager (such as MySQL, PostgreSQL, Oracle, etc) used by the application and making SQL queries to recover them. More precisely, for each polygon Pi in M1, a spatial SQL query is made to determine all polygons in M2 whose bounding box overlaps the Pi bounding box. Thus, in the next step, the operator TeOverlay is used to obtain the intersection points between the polygon Pi and the polygons candidates obtained in the last step. Using the intersection points obtained, the polygons’ borders are fragmented and each fragment is classified related to the other polygon to identify if the fragment is inside, outside or on the border of it.
A. de Magalhães The events are stored in a list E, named event scheduler, that is sorted in non-decreasing order by the x values. This list is initialized with the extreme points of all segments. The algorithm also uses a list L to store the segments that are intersected by the sweep line – these segments are called active segments and the list is sorted in non-decreasing order by the y values. The list L is dynamically updated when a event occurs: if an event corresponds to a left point, all the right segments are inserted in the list L; in right point events, all the left segments are inserted in the list L and in intersection point events, the intersection segments are reciprocally swapped – the first segment is swapped with the last one; the second with the second from the last, and so on.
The array crossings is used to store the indices of the line segments of Pij that cross the upward ray from f. Since in real maps the number of crossings is usually very small in comparison to the number of line segments being processed, one expects the array crossings to be very small too. The variables begin and end store initially the first and the last indices of crossings. Figure 15(b) illus- 12 A. C. G. -T. Wu trates the initial state of the array crossings and the indices begin and end. The numbers stored in the fields of crossings corresponds to the indices j of the segments vivj that the upward ray intersects.