Tools for rosbag analysis - Others that are used?

asked 2013-10-16 06:08:34 -0600

eacousineau
172 ●8 ●11 ●16

updated 2013-10-16 06:16:54 -0600

What tools have people developed and use for rosbag analysis?

I know of rqt_bag (which is an absolutely awesome tool), which allows you to browse the topics in a concise timeline, and using that in conjunction with rqt_plot to plot data. However, it's still a little cumbersome to extract data for more detailed analysis.

I've created a small package using numpy that will parse a rosbag given a set of topic paths (consisting of fields and optionally indices, much like extracting data for plotting) and return simple multi-variable data sets for ease of plotting and analysis, which includes interpolating data sets so that they are on a time scale (with the same spacing). This allows basic errors to be computed. If you also published the same data, you can use this to potentially see delays between the different publishers. You can always run the conversion, then save the final datasets to Matlab to plot and examine as well. Really easy to do in Spyder.

Will upload the package in a bit.

EDIT: Googled and saw Pandas from this presentation: https://speakerdeck.com/nzjrs/managing-complex-experiments-automation-and-analysis-using-robot-operating-system Looks interesting, will start looking at this.

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answered 2014-06-13 13:33:24 -0600

aktaylor08
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If you are interested in using pandas. I have a simple somewhat inefficient python package to get a bag file into a pandas dataframe indexed by the bag record time.

https://github.com/aktaylor08/ros_pandas

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Thanks! I'll check that out.

eacousineau ( 2014-06-18 06:13:13 -0600 )edit

This is awesome. To get a dataframe with a common time index (no interleaved data) use this on top of ros_pandas: http://pastebin.com/hJFR7HbA

xaedes ( 2014-09-19 18:32:43 -0600 )edit

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answered 2013-10-16 06:45:37 -0600

Dan Lazewatsky
9115 ●79 ●103 ●160 http://dan.lazewatsky.com/

I think you bring up a good point that there isn't really a centralized place to find out about working with recorded data. There are of course the wiki pages for rqt_bag/rqt_plot/rosbag, but those are specific to those tools. For example, I needed to export video from a bag and the relevant wiki page wasn't sufficient, so I had to write my own tool to export variable framerate video (https://github.com/OSUrobotics/bag2video). I bet somebody else has already done this, but couldn't find anything. Countless times, I've also had to write one-off scripts to export data as mat files.

Anyway, a wiki page with a more comprehensive list of tools for working with recorded data could be very useful.

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answered 2019-01-29 01:18:54 -0600

lii55a
1

If commercial tools are an option, then this unstructured analytics tool SpectX can parse and analyse .bag files quickly and at a large scale. No import required before starting to analyse data. Overview: https://www.spectx.com/solutions/robot-operating-system Documentation: https://docs.spectx.com