Getting altitude above sea level

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Shay Lavi

• August 09, 2023 16:09

Hello I’m trying to get the altitude above sea level of the drone. When I am getting KeyTakeoffLicationAltitude I get a value that is not near to what is displayed on the app. Example - app says altitude on the ground is 16 m and the key says 65 m

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  DJI Developer Support

  • August 10, 2023 12:35

  Could you provide us with a photo to indicate which value of the app you would like to obtain? Please note that the altitude obtained by the aircraft in GPS mode may have some errors. Only when RTK is enabled can you obtain accurate altitude.

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  Shay Lavi

  • August 11, 2023 13:36

  You can find the image with the indication here: https://ibb.co/2qmCxm5

  I want to obtain the altitude above sea level and not the altitude above takeoff location.
  How inaccurate is the normal gps altitude data?

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  DJI Developer Support

  • August 14, 2023 06:18

  You can consider using the `RtkMobileStationKey.KeyRTKTakeoffAltitudeInfo` to obtain the altitude of the takeoff point. By adding it to the relative takeoff altitude of the aircraft（KeyAircraftLocation3D）, you can calculate the approximate absolute altitude.： How inaccurate is the normal gps altitude data? --I cannot provide you with accurate information because the altitude is obtained by combining latitude, longitude, and barometric pressure readings.

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  Shay Lavi

  • August 16, 2023 07:04

  To get the altitude of the aircraft using the RTK station data should I use:

  RtkMobileStationKey.KeyRTKAbsoluteAltitude

  or should I just use the:

  FlightControllerKey.KeyAircraftLocation3D

  The MSDK v5 docs don't have any information about the RTK key

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  DJI Developer Support

  • August 16, 2023 14:08

  To obtain the altitude information of RTK, it is recommended to use addRTKLocationInfoListener.（https://developer.dji.com/api-reference-v5/android-api/Components/IRTKCenter/IRTKCenter.html#irtkcenter_addrtklocationinfolistener_inline） This is our packaged interface, which will be more stable.

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  Alexboyko426

  • August 18, 2023 11:40

  Shay Lavi to get take off alt above sea level, use key 

  KeyRTKTakeoffAltitudeInfo

  then calculate aircraft alt same as it is in sample app:

  aslAltitude =
      GpsUtils.egm96Altitude(
          rtkTakeOffLocation + aircraftLocation!!.altitude,
          aircraftLocation.latitude,
          aircraftLocation.longitude
      )

  before using GpsUtils class, you need to call 

  GeoidManager.getInstance().init(context)

  Spend some time on it, hope it helps. Cheers

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  DJI Developer Support

  • August 20, 2023 09:06

  Thank you for the addition, Alexboyko426. You are correct. If you need to use egm96Altitude, it is necessary to call the method GeoidManager.getInstance().init(context), otherwise all interfaces will be invalid.

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