#2910: underground, landmarks
, last check: Mon, 24 Aug 2026. Post history
-
underground
Offline motion detection based on the signature of vibration frequencies allows for precise positioning in underground transportation where GPS does not reach
https://blog.transitapp.com/go-underground/ -
landmarks
More than 84,000 delimitation landmarks (terms) located and mapped in the IGN France campaign to recover this heritage, which dates back several centuries.
[FR]
https://macarte.ign.fr/carte/H9R6EZ/Ensemble
Raf