PostGIS in Action, Second Edition

Chapter 11. Geometry and geography processing

This chapter covers:

Spatial aggregation

Clipping, splitting, tesselating, and segmentizing

Translating, scaling, and rotating geometries (affine operations)

Using geometry functions with geography types

This chapter demonstrates techniques for manipulating geometries and geographies, and the end result is generally another geometry or geography. Unless we tell you otherwise, all functions that we demonstrate in this chapter work with both data types.

Through the years, we’ve amassed a catalog of problems that GIS users encounter, and in this chapter we’ll share with you the most common problems and our solutions. Keep in mind that multiple solutions exist for a given problem. We by no means proclaim ...