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There is a parameter you set as a part of the obstacle layer defined in the cost map parameter files -

~<name>/track_unknown_space (bool, default: false)

    Specifies whether or not to track what space in the costmap is unknown, meaning that no observation about a cell has been seen from any sensor source.

Setting this to true, will make your robot move to\in unknown spaces. This is not exactly the safest thing to do (If the map doesn't update fast enough and the robot crashes into an obstacle that is in the unknown space) which is why the default value is false.

You can find it more information about it here - http://wiki.ros.org/costmap_2d/hydro/obstacles.

There is a parameter you set as a part of the obstacle layer defined in the cost map parameter files -

~<name>/track_unknown_space (bool, default: false)

    Specifies whether or not to track what space in the costmap is unknown, meaning that no observation about a cell has been seen from any sensor source.

Setting this to true, will make your robot move to\in unknown spaces. This is not exactly the safest thing to do (If the map doesn't update fast enough and the robot crashes into an obstacle that is in the unknown space) which is why the default value is false.

You can find it more information about it here - http://wiki.ros.org/costmap_2d/hydro/obstacles.