samueltoh

@propertyxray

Founder of Property X-Ray. I write about spatial data, PostGIS, and AI agents.

Melbourne, AustraliaJoined June 2026

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Solo founder of Property X-Ray (propertyxray.com.au), a data hub for Queensland property due diligence. I build with Node and use PostGIS heavily for it. Love writing about spatial data, open data, and turning messy public datasets into clear answers.

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Ssamueltohsamueltoh.hashnode.dev5d ago · 3 min read

Point-in-polygon: one PostGIS query for geofencing, zones, and spatial lookups

You've got a coordinate. You've got a pile of regions on a map. You need to know: which region does this point fall in, or is it inside one at all? That single question hides inside a lot of features:

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Point-in-polygon: one PostGIS query for geofencing, zones, and spatial lookups

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samueltoh

About

Available for

samueltoh's blogs

Recently published

Point-in-polygon: one PostGIS query for geofencing, zones, and spatial lookups