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No, it's not. The occupancy grid representation of the map (for example, the pgm bitmap) doesn't contain enough state to resume mapping. Internally, gmapping is estimating a distribution over maps and robot trajectories, using a particle filter. To resume mapping, you'd have to save all of that internal state. In principle, it's possible to do that, but it's not currently implemented, and I would guess it would take quite a bit of work.