Reply With Quoteheight from the see surface? or height from the surface? (these are used in plane navigation, so I can name them as fairly objectively practical and registered ones)... But maybe there are other kinds too. For example height from the earth center?
We have latitute and longitude, is there a measurement for how far off the Earth's surface we are, such as I am on the 10th floor? I know we can say 10,00 feet, but is there a 3-D coordinate?
height from the see surface? or height from the surface? (these are used in plane navigation, so I can name them as fairly objectively practical and registered ones)... But maybe there are other kinds too. For example height from the earth center?
But I want consolidated units.
X, Y, Z?
You mean you need the height be of the same nature of the X and Y?
If so i think it is not possible in euclidean geometry, since X and Y are actually curves in euclidean geometry (they are lines spanned on the surface of a sphere), but Z here is a straight vertical line. So we will need non-euclidean geometry for that combination...
Or we can ignore the small error converting the curves into fake straight lines produce, and say we have a X, Y, Z system, all in metric units.
I guess the former is used in GPS, while the latter is used when reporting to the end-user the location (since the user doesn't care about those calculations). If you yourself know the answer, i am so curious to know.
You may wish to investigate the World Geodetic System. I believe the most current version is WGS 84. This is the basis of GPS. Unfortunately, I have no expertise to offer beyond knowing the name of the system
John
hlsmith (10-05-2012)
This might help. As smoothjohn said most GPS's are based on WGS 84 and use a know base station coordinate for the z value, but as this doc. suggests, it is not always known what they are using. in this guide, it helps you calculate this.
http://homepages.slingshot.co.nz/~geoff36/datum.htm
The earth is round: P<0.05
hlsmith (10-05-2012)
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