[ros-users] CSV with time from bag files

[Miguel Prada]

Hi,

I want to manipulate some data from a bag file with a spreadsheet. I'm exporting from the bag to CSV using 'rostopic echo -p -b BAGFILE TOPIC >> file.csv' but I just realised that the time field you get from doing that is the time corresponding to when rostopic is run, not the time stored in the bag file. That means that if I use this method to output messages in one topic and then repeat for another topic (e.g. controller commands and robot positions) the time fields on both CSV files are of no use at all to merge the data in those two files.

I tried using 'rostopic echo -p -b BAGFILE -a >> file.csv' to print all topics at once, but the output is quite messed up and doesn't clearly state which data corresponds to which topic.

Does anyone have any suggestion on how should I proceed with this?

Miguel.