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I have these parameter in my system.

 <AirportReferencePoint>N27584300 E034233600 43.586400</AirportReferencePoint>

What is the use of the altitude 43.586400 in these parameters?

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Your data contains 3 parameters, Easting, Northing and Altitude. Think of it a X,Y,Z coordinates to draw your point in 3D or space. If the altitude is related to your location on the ground than it is fine, however some objects may be above the ground and the Altitude might be representing height of obstacles. This is an example of how it can be used.

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    The altitude is related to a height datum not the ground... what is problematic is that the units aren't specified, ARPs' should always have their height in feet as altimiters on aircraft are in feet. The vertical coordinate system needs to be implicitly defined. Almost any other coordinate of an object you could (reasonably) safely say that the units are metres like the easting, northing.
    – Michael Stimson
    Commented Aug 8, 2023 at 4:03
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    True ! You are right.
    – GforGIS
    Commented Aug 8, 2023 at 4:05
  • The N and E values are actually packed DMS (degrees minutes seconds, DDMMSSss/DDDMMSSss. It's Sharm el Sheikh airport.
    – mkennedy
    Commented Aug 9, 2023 at 21:23

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