9 Proximity analysis
This chapter covers
- Nearest neighbor searches
- K-nearest neighbor (KNN) distance operators
- Using KNN with
geographyandgeometry - Geotagging
- PostGIS clustering window functions
Once you’ve located places with a set of coordinates, questions such as the following arise: How far is my house from the nearest expressway? How many burger joints are within a mile drive? What’s the average distance that people have to commute to work? Which three hospitals closest to me offer emergency vasectomies? If I need to get at least this much exercise but don’t want to overdo it, how many kale shake joints are between 1K and 2K away from my home? How do I assign visits to my field reps to balance the work? We’ll file all these questions ...
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