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Hi,
I think that you are looking for map_saver, which can convert costmap into map file.

Costmap cells can vary from "obstacle" to "free" (with "unknown" special case) as explained in the wiki.
map cells are trinary: obstacle, free, unknown. You will see some configuration variables (as occ and free) for map_saver that will let you personalize thresholds if default ones do not suit your needs.

NB: a little indentation / spaces in your question would have been great ;) thanks!

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