A municipal map and a resident's mental map of the same neighborhood rarely agree. Official cartography favors administrative boundaries, street grids, and property lines. The map a person carries in their head is built instead from safety, memory, habit, and social ties — a geography of where one belongs rather than simply where one is.
Kevin Lynch's mid-century studies of 'legibility' gave urban researchers an early vocabulary for this gap, but anthropologists pushed the method further by asking subjects to literally draw their own maps by hand. The resulting sketches routinely compress some areas, omit others entirely, and enlarge the blocks that matter most to daily life.
These cognitive maps are especially revealing at the edges — the informal borders between neighborhoods that appear on no official document but are policed, felt, and reproduced daily by the people who live near them. A single street can mark a boundary that is invisible to a planner and unmistakable to a resident.
For fieldworkers, hand-drawn maps are also a way of handing narrative authority back to the people being studied: the researcher records where the boundary is, but the resident decides where it goes.