View Full Version : Question with Long/Lat

07-17-2009, 03:25 AM
Good day!

I just wanted to ask if will there be a difference in the coordinates if I have two points at exactly the same spot but in two different floors? Say for example one point is in the 1st floor and the other one is in the second floor?


07-17-2009, 07:46 AM
There shouldn't be - latitude, longitude are a bit like x,y - there's no vertical information as such.

Technically a really tall building should result in a slightly different latitude ordinate for the upper floors. This is because the Earth is not a true sphere, so if you follow the line connecting your two points, they do not go through the centre of the Earth.
BTW, this effect will be smaller than the measurement error on any consumer GPS!