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An introduction to spatial database system PDF 下载
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Modeling: Organizing the Underlying SpaceDiscrete Geometric Bases
Simplex and simplicial complex:
Simplex :For each dimension d, a d-simplex is a minimal
object in that dimension. Any d-simplex is composed of
(d+1) simplicies of dimension d-1.
Simplicial complex: A finite set of simplices such that the
intersection of any two simplices in the set is a face (simplex
of d-1 dimension)
Modeling: Organizing the Underlying SpaceDiscrete Geometric Bases
Realm: Conceptually represents the complete
underlying geometry of one particular application
space. A realm is a finite set of points and lines over
discrete grid.
Modeling: Spatial data types
Example : Rose algebra
Three data types
Points ---a set of R-points
lines ----a set of disjointed R-blocks
regions ---- a set of edge disjoint R-faces
Values are realm based, composed from elements from realm.
Kind : type sets
EXT = {lines, regions}
GEO= {points, line, regions}
=A kind for all partitions
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