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Finally got the answer... Found it here https://answers.ros.org/question/193925/local-costmap-is-empty/ I had to change min_obstacle_height to 0... He says it is because map wall in STDR is defined to be lower than my paramter (1) but I could only find STDR for kinetic and I am working with melodic. So I don't know whether (or where) I can change that to fit with my parameters. At least it is working for now :)

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