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Octomap slows down with increase in map size

I'm trying to use octomap with a velodyne HDL-32E sensors point cloud. I move around in a large complex (Approx 1 km by 1 km) and generate the map. The map update rate is really good when the total map size is small (I can see moving cars and people being classified into obstacles), but as the map size increases, the update rate slows quite a lot. Can someone suggest me ways to overcome this problem? I'm currently considering just running the map in the local frame to get immediate obstacles, but this will defeat the purpose (global planning) for which I had switched to octomap.