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MSFS20 altType Attribute

scruffyduck

scruffyduck

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There are a number of elements in the airport which now have an attribute called AltType. There are two options GEOID and ELLIPSOID. They both represent a meaning for AMSL. Here is a post from ASB which explains them

Both ellipsoid and geoid are 2 altitude models to represent AMSL (above mean sea level) altitudes (not above ground level).
Basically, Geoid is the “correct” one, more precise, based on some actual data, while ellipsoid is a “simplified” model representing the Earth as a perfect ellipsoid (3D ellipse, kinda like a sphere but slightly flattened).
In the wikipedia geoid article https://en.wikipedia.org/wiki/Geoid, you can visualize a difference between geoid and ellipsoid models (https://en.wikipedia.org/wiki/Geoid#/media/File:Geoundnsrp.png)
Click to expand...
 
And why would you want to specify this when making an airport? I mean when developing the terrain system you have to worry about this (and for example to calculate the curve of the earth I had to take the geoid into account as well). But when you design an airport I don't see why you need to know this.
 
I have no idea other than it is an attribute provided by the xsd - it can be set to default and ignored
 
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