By Martin Breunig
The booklet offers with critical subject matters: facts modeling and administration for 3D gadgets in the course of diverse time states and the hole of geoinformation structures to a brand new new release of component-based GIS. the way in which from first geo-database kernel structures to a component-based GeoToolKit is gifted. moreover, the implementation of a component-based GIS with geological and geophysical functions is defined. With the typical facts entry to a geo-database the geological and the geophysical purposes are introduced nearer jointly and take advantage of each one other's interpretations of the knowledge.
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Additional info for On the Way to Component-Based 3D/4D Geoinformation Systems
Example text
A detailed description of the retrieval, deletion and insertion of objects into the R-Tree has been presented in GU'ITMAN (2984). 3 From the Relational to the Object-Oriented Database Design The Relational Data Model is well suited for the modelling of thematic data. However, there are disadvantages concerning the modelling of geometric and topological data. This has lead to a separated management of these different kinds of data. e. geometric and topological data is realized with the help of specialized geometric representations in main memory.
The spatial join operation compares two object sets according to a geometric predicate. The result contains the object pairs that meet the query predicate. The preselection is realized with the axis-parallel minimal circumscribing rectangles as a spatial key of the real geometries. An important aspect is to achieve the best possible physical clustering of the objects on secondary memory. This means that the geo-objects have to be stored as closely as possible according to their spatial neighbourhood in 2D or 3D space.
20). s1 Fig. 20 Case b): only the right end point is inside SI h does not intersect any segment of $2. Case c) Only the left end point is inside S I . The right end point is inside S2. 1 s1 Fig. 21 Case c-1): the right endpoint is inside S2 True to the recursive invariant: all intersections between h andl the segments in S2 are already computed. c-2) The right end point is right of S2. s1 Fig. 22 Case c-2): the right end point is right of S2 h totally "crosses" S2. h potentially intersects a certain sub-set of segments in S2 .
