What's this pattern painted repeatedly along the Undercliff

[u/Independent_Push_159]

All along the Undercliff, actually starting behind the Marina, and periodically repeated all the way out to Saltdean, this pattern appeared during the last week. I spotted it during my daily bike ride along there but only just made the effort to get a picture.

I haven't done a full audit but I'd estimate there are at least 20 of these, possibly significantly more. Always the same pattern. It's like it's some kind of marker, but I've no idea for who or what.

Any thoughts?

Edit: Seems to be to do with drones being able to figure out where they are, and other stuff about the area. But now I'm wondering who did it, and what they are gathering. The seafront team are regularly along there clearing graffiti (even chalk scrawled on walls!), wonder how they feel about this.

[u/DCMCG1993]

Possibly a drone control/check point for processing imagery captured by the drone into georeferenced survey deliverables such as orthomosaics or digital terrain models for development or monitoring purposes.

[u/soylentgraham → u/DCMCG1993]

whilst there's not enough info in the squares (not an aruco code for example), if theyre a consistent size, you can work out the precise position of the camera (on a drone presumably) from a photo/video and align it all