Other application domains of spatial intelligence are too numerous to enumerate, because spatial intelligence is a horizontal capability: any field that must perceive, reconstruct, localize within, or reason about the geometry of the physical world inherits the methods of Part III.
This chapter takes five further domains where that inheritance is already visible in deployed systems. Each stresses a capability the earlier chapters do not: registering a building site against its design, tracking many near-identical agents through occlusion, reconstructing fragile objects faithfully, working without clean light or satellite positioning underwater, and binding people to products across a network of cameras.