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Ublox M8N altitude error

Posted by Francisco Gonzales on November 11, 2015 at 10:38am

I am running the M8N with a pixhawk. I was doing some camera calibrations and i notice that the altitude reported by my images was much less than what I was commanding to the vehicle. I verified the discrepancy by taking a pic of a 3x4 wood board and doing the math to figure the height. 

Has anyone else experienced this?

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Replies

  • Paul Meier November 11, 2015 at 10:43am

    Much less like how much? cm, meters, km ?

    • Francisco Gonzales > Paul Meier November 11, 2015 at 10:46am

      at a commanded 200ft the images were saying 135ft. 

      • Paul Meier > Francisco Gonzales November 11, 2015 at 10:51am

        gps altitude is not too accurate but 60 ft difference is quite a lot.

        How accurate is your gps altitude when you are on the ground ?

        Have you tried to read the logs and check the difference between baro and gps ?

        • Francisco Gonzales > Paul Meier November 11, 2015 at 11:13am

          gps alt is right on what google earth says the elevation is.

          baro alt is reading in agl

          GPS seems accurate at the ground

          • Paul Meier > Francisco Gonzales November 12, 2015 at 3:34am

            Francisco, what is the gps vs baro alt (difference) ?

            • Francisco Gonzales > Paul Meier November 12, 2015 at 12:39pm

              350ft which is msl elevation of the launch area

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