April 2011
Beginner to intermediate
520 pages
18h 55m
English
Content preview from PostGIS in Action
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Chapter 5. Relationships between geometries
This chapter covers
- Intersections and differences
- Intersect relationship types
- Equality
- Nearest neighbor
- Arbitrary relationships
- Dimensionally Extended 9 Intersection Model (DE9IM)
As the old saying goes, “No man is an island”; the same holds true for geometries. In the previous chapter we concentrated on describing geometries in isolation. We described common properties for geometries and various functions to measure, morph, or transform single geometries. From this chapter forward, we’ll no longer entertain ourselves with one geometry at a time. The richness and the power of spatial queries really come to light when we start working with more than a single geometry. If we liken geometries ...
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