Distance between two GPS points with altitude

hbruno said:

under the latitudes of France or Belgium (~45°), it is usual to take 6371000 for the radius of the earth instead of 6378, which is the radius of the earth at the equator. (https://fr.wikipedia.org/wiki/Rayon_de_la_Terre)

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Informatix said:

Yes, my mistake. I thought that the Earth curvature had a significant impact. It is not the case for distances < 100 km.

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sorex said:

I bet it does when you track a distance like riding the mont Ventoux.

1km billiard or 1km at 10-15% will be different in lenght on a flat map.

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