I have received data from an RTK-GPS, in an environment free from buildings and other GPS obstructions. the covariance of these data is 0.01. now I do not know this is good or not? How can I find out what is the accuracy of my GPS data? is there any solution?

latitude longitude altitude position_covariance0 ... position_covariance4 ... position_covariance8 52.06669 -0.626525 156.98 0.0121 0.0121 0.1936

Thanks a lot


How "good" the data is depends on how useful the results are for you.

The only way that you can check accuracy is to compare your measured results to a true result - this would require you to measure from a known location.

  • $\begingroup$ thanks , one more question what is the meaning of covariance in the output of GPS? header: seq: 3583 stamp: secs: 1626697000 nsecs: 617268281 frame_id: "novatel_mount_link" status: status: 2 service: 1 latitude: 52.0720616667 longitude: -0.627813333333 altitude: 150.98 position_covariance: [0.0004, 0.0, 0.0, 0.0, 0.0004, 0.0, 0.0, 0.0, 0.0064] position_covariance_type: 1 for instance in this output, what does covariance mean? and what is its unit?meter?centimeter? $\endgroup$ Jul 21 '21 at 8:56
  • $\begingroup$ @MasomeRahimi - You'd have to check with the manufacturer and/or the datasheet for the particular device. $\endgroup$
    – Chuck
    Jul 21 '21 at 15:35

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