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The built-in geometric types work as expected only at the equator. They become more and more distorted as the move toward the poles. Circles become ellipses.
by mleonhard 7y ago
The built-in geometric types work as expected only at the equator. They become more and more distorted as the move toward the poles. Circles become ellipses. Lines curve.
PostGIS's built-in Geometry types maintain their shape anywhere on the globe.
- ris 7y agoI think you might be thinking of Geography types. Geometry types really just operate in the 2D euclidean space which their associated SRS maps them to. And no 2D SRS can accurately represent the reality of working on a sphere, so I'd be very surprised if you found you could move a circle from the equator to europe and it remain a circle when back-projected. Geography types try to deal with this sort of weirdness but are unfortunately slower and more complicated to work with.