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Discrepancy Between .csv and .mat file data

Posted by Mark Agate on December 11, 2014 at 12:30pm

Hello all,

I am working on a project where I am doing a lot of data post-processing in MATLAB. I used the Create a MATLAB File in Mission Planner to convert my tlogs to .mat. After analyzing the data and realizing things were messed up I converted the same tlog to .csv. Upon looking at the same data and performing the same analysis the results were a lot better. I dug deeper and found that the .mat file has bad raw data points whereas the .csv file has the "correct" (as far as I know) raw data.

Also, plotting data from the .csv file matches graphs created in Mission Planner under the Telemetry Logs tab whereas the MATLAB plots do not match.

Is there any reason why this could be? Are the .csv files and .mat files created differently from Mission Planner? On my end I am just looking at the raw data in both file types.

Thank you,

Mark

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Tags: data analysis, csv, data, mat
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Replies

  • mikiuse March 17, 2015 at 6:02am

    how do you convert a tlog file yo a csv format?

    • Mark Agate > mikiuse March 17, 2015 at 6:05am

      In Mission Planner, under Flight Data in the box under the HUD click on the Telemetry Logs tab. Click Tlog > Kml or Graph, in the popup window there should be a button to select Convert to CSV.

      • mikiuse > Mark Agate March 17, 2015 at 6:55am

        Thank you.

        If I want the GPS time not elapsed time how would I extract this data?

  • Developer
    Michael Oborne December 14, 2014 at 2:44am

    can you give me an example fieldname etc, so I can confirm the issue?

    • Mark Agate > Michael Oborne December 14, 2014 at 5:48am

      Hi Michael,

      I am looking at the Analog Airspeed set-up on an APM2.6 running Arduplane and transmitting with an XBEE wireless setup.

      Thank you for looking into this.

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