What is a saturation map in canvassing?
A shaded view of which streets have already been worked and which have not, so a crew stops re-knocking the same block.
A saturation map colors an area by coverage rather than by outcome. Worked streets shade in; untouched streets stay clear. One glance answers the question every canvassing manager asks at 4pm: where has nobody been yet?
It solves two expensive problems at once. It stops double-knocking, which wastes payroll and annoys homeowners who have now met three roofers from the same company. And it stops the opposite failure — whole blocks inside a hail swath that nobody ever walked, because the easy streets got worked first.
Saturation only means something if pins are logged honestly and in real time. A map fed by end-of-day memory is a map of what people remember doing, which is not the same thing.