traewelling/google-polyline

A PHP library for encoding and decoding Google Maps polylines.

v0.1 2025-07-15 22:22 UTC

Requires

• php: >=8.3
• ext-json: *

Requires (Dev)

• phpstan/phpstan: ^2.1
• phpunit/phpunit: ^12.2

MIT

README

Since Transitous/Motis uses a non-standard implementation of Google's Encoded Polyline Algorithm Format, we needed to implement a custom decoder for it.

Motis returns a EPAF string in the legGeometry field with a custom precision of 7 decimal places in v1 and 6 decimal places in v2. Google's implementation uses 5 decimal places, so we need to adjust the precision accordingly.

This package supports every possible precision but is only tested with 5 and 6 decimal places.