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Well observation_source could be used to use for example scan data to create a map. This might be used for the local costmap. As you use the static parameter, the costmap depends on NO other data then a published map(from gmapping for example). So if you want to create a global_costmap set the static parameter to true. By increasing the update and publish frequency you can keep the costmap up to date more accurately.

The tracking of unknown_space is independent to an observation_source or whether you use static or a rolling_window approach.

Hope this helps.