How create an occupancy map or grid FROM a 2D map
Hello, I created a 2D map with gmapping but now when I want to use the octomap to create a 3D map, with an occupancy map and it said that's no map received. I succeeded to do this with gazebo. I work on turtlebot2 and with a kinect. I don't succeed in a reality, with a real room. I'm a beginner of ROS, so if someone would help me, that'd be nice.
Thanks for your answer
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