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Is there a way to save all rosbag data into a .csv or text file ?

asked 2013-02-12 05:18:37 -0500

Hi all!

I would like to extract the data from the rosbag and convert it into text or .csv file to use the data into Matlab and Excel. Is this possible ?

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answered 2013-05-29 11:35:26 -0500

NickSpeal gravatar image

updated 2014-04-29 01:34:25 -0500

fivef gravatar image

Please see this answer for a simple script to save all topics in the bag file as a seperate csv.

Please let me know if you found this useful or if you have any suggestions for how to improve it.

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answered 2013-02-12 07:22:23 -0500

Mani gravatar image

This is taken from this answer for a similar question:

For simple message formats, you can convert directly to CSV from the command line:

rostopic echo -b file.bag -p /topic

This won't work well if your bag file contains arrays/images/pointclouds/etc... as it renders the entire message to text.

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This is so awsome

kaiyu gravatar imagekaiyu ( 2017-02-10 16:50:44 -0500 )edit

What are the meaning of the -b and -p flags ?

tonyParker gravatar imagetonyParker ( 2018-06-04 05:49:13 -0500 )edit

-b Display messages in a bag file.

-p Display messages in a matlab/octave-friendly plotting format.

From here.

IanCol gravatar imageIanCol ( 2019-07-23 12:35:02 -0500 )edit

answered 2013-02-12 05:42:11 -0500

Here's a quick way:

rosbag play mybag.bag
rostopic echo /foo > output.txt

This will output all message in the topic /foo to a yaml-formatted text file. You can then parse the file. It might be useful to output to multiple files for different fields. Let's say the message type on /foo is Pose:

rosbag play mybag.bag
rostopic echo /foo/position/x > output_x.txt
rostopic echo /foo/position/y > output_y.txt
rostopic echo /foo/position/z > output_z.txt

You can also look into bagys, which are an extension of the concept above.

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Hi there! Is the other way around possible. i.e., convert from a .txt to a .bag? Thanks in advance!

TSC gravatar imageTSC ( 2014-08-26 13:45:29 -0500 )edit

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Asked: 2013-02-12 05:18:37 -0500

Seen: 34,462 times

Last updated: Apr 29 '14