Publishing from Octomap_server

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Ok! So if I publish a map on octomap_server this map will be also automatically passed to costmap_2d?! Can you help me telling me what have I to write to read a costmap2dRos object from a costmap_2d node while i'm in a new Ros-node created by me? Thanks a lot for all the answers

It's there to be used, but published on projected_map instead of map to avoid conflicts with another map server running. If you want to used this as the map topic remap projected_map:=map when starting octomap_server. For follow-up questions, please open a new one.