carroyer

A specialized, now slightly dated cartography and surveying term for dividing a map or plan into a regular grid (carroyage) to help with measurements or referencing points — the Académie française lists it as an old-fashioned synonym for quadriller.

• Le géomètre a carroyé le plan du terrain avant de le mesurer. — The surveyor gridded the plot plan before measuring it.
• Les cartographes carroyaient autrefois leurs cartes à la main. — Cartographers used to grid their maps by hand.
• Ce vieux plan carroyé permet de localiser précisément chaque parcelle. — This old gridded plan makes it possible to precisely locate each parcel.

In everyday modern French, quadriller has almost entirely replaced carroyer outside of specialized surveying/cartography contexts — don't expect to hear it in ordinary conversation.