velodyne_height_map
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added new param "clearance_height"
so that it does not consider overhead bridge as obstacle ( only if value > 0.0) clearance_height is relative height from laser position
I think I follow your logic, and it looks OK at a glance.
The clearance_height
needs to be defined relative to whatever frame_id
the cloud is using. That might be the device, "velodyne", or it might be some ground-relative frame like "odom".