@propertyxray

samueltoh

@propertyxrayMelbourne, AustraliaJoined June 2026

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

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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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samueltoh's blogs

Samuel Tohsamueltoh.hashnode.dev1 post

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:

Jun 21 · 3 min readsamueltoh.hashnode.dev

samueltoh (@propertyxray) | Hashnode

samueltoh

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samueltoh's blogs

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

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samueltoh

About

Available for

samueltoh's blogs

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