[defrost]

I spent a number of years in mapping, global reconcillation of pre-WGS84 ellipsoids and datums with post GPS unification, national mapping projects etc.

There are many map arcana tales, yet another reason for "trap streets" - fake data infill, is to realistically fill voids left by top secret classified national security areas.

The UK Ordnance Survey famously produced rich detailed maps across all of the United Kingdom .. save for blank voids over naval shipyards, weapons testing, secret nuclear bunkers, etc . . .

Eventually somebody cottoned onto the reason these voided areas became magnets for Russian agents - nothing signified something of great interest.

[andyjohnson0]

> The UK Ordnance Survey famously produced rich detailed maps across all of the United Kingdom .. save for blank voids over naval shipyards, weapons testing, secret nuclear bunkers, etc

The US/UK BMEWS station at Fylingdales in North Yorkshire used to be omitted from OS maps. Utterly pointless as there were three huge 40m+ high radomes on the site, which was next to a main road.