The vertical elevation of an object above a surface (as sea level or land) of a planet or natural satellite
A natural or artificial object orbiting near a bigger object (typically a planet)
|Error much greater||
"Quote from the third link - the altitude error is much greater because it is a satellite based system"
from question "How accurate is the altitude measurement in mobile phones"
"Vertical position altitude needs one more satellite in view at least 4 so is not always reliable if gps sees only 3 satelites"
from question "Why is CLLocation's Vertical Accuracy better than it's Horizontal Accuracy?"