Correct way to use Costmap2DROS

asked 2015-06-11 20:01:03 -0500

Sebastian
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I have an "algorithm" node, which designs a path for a turtlebot to follow based on a static_map being published by a map_server.

Inside my algorithm node, I instantiate a Costmap2DROS object. Then, I do stuff like map->getCostmap()->getCost(x,y) etc. in order to get the cost values and information about the map.

Is this the correct way to go about reading maps in the ROS system? I just want to make sure I am on the right track so far.

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answered 2015-06-12 03:01:07 -0500

Sebastian Kasperski

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It seems like a reasonable thing to do. You basically initialize a global costmap with your static_map from the map server. However, if you don't need specific functions from Costmap2d, you can also just subscribe the map topic in your node and directly work on the nav_msgs::OccupancyGrid data. But especially for planning I think using Costmap2d is the way to go.

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Ok, thanks. I was confused because there are so few examples using Costmap2D that I wasn't confident about the intended usage.

Sebastian ( 2015-06-12 11:54:00 -0500 )edit

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answered 2015-06-12 06:29:36 -0500

Progtologist

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On a related note: What is the best way to perform collision queries for a global planner? There is the base_local_planner::WorldModel::footprintCost which returns negative cost if the footprint collides with an obstacle. Is there something similar for the global_planner that checks the point-robot against the inflated obstacles for better performance?

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I think I have found the answer: costmap_2d::Costmap2D::getCost returns the point-robot collision against the master layer of the costmap.

Progtologist ( 2015-06-12 09:12:34 -0500 )edit

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Correct way to use Costmap2DROS

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