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unable to update octomap correctly using insertPointcloud

asked 2020-01-17 15:36:27 -0600

zhefan gravatar image

Hi,

I would like to use octomap for turtlebot path planning. My issue is:

I want to update my map after my robot reaching the desired position. To do this, I use the octomap method insertPointCloud(pointcloud, sensor_origin). The pointcloud data is obtained from projectLaser method (which convert /scan to /poincloud2). And sensor_origin is the odometry of turtlebot.

The result map I get is "overlapping" which is not correct. (sorry for unable to upload pic here) Anyone have thoughts what could be the potential reasons for that?

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answered 2020-01-19 19:53:22 -0600

Namal Senarathne gravatar image

Hi,

The API call you use in Octomap expects the input pointclouds to be correctly registered (i.e. aligned) with respect to the global coordinate frame. (In fact Octomap library doesn't do any form of pointcloud alignment at all, so you are responsible in providing the correctly aligned pointclouds). You can play around with something like PCL pointcloud registration (http://pointclouds.org/documentation/tutorials/#registration-tutorial) to align the pointclouds correctly.

Also, you would most definitely would require to use a localization or a SLAM solution that generates a more accurate estimation of the current pose of the sensor, as opposed to using the odometry of the turtlebot.

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Thank you very much! Your answer really makes sense to me. I also find another method in Octomap InsertPointCloud(pointcloud, sensor_origin, frame_origin). I wonder if this method can deal with unregistered pointcloud? (Just want to know if I can avoid using PCL)

zhefan gravatar imagezhefan ( 2020-01-19 20:06:25 -0600 )edit

Hi, no even with InsertPointCloud(pointcloud, sensor_origin, frame_origin) you still need to compute the transform (i.e. do the registration)

Namal Senarathne gravatar imageNamal Senarathne ( 2020-01-23 20:28:04 -0600 )edit

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Asked: 2020-01-17 15:36:27 -0600

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Last updated: Jan 19