[Tagging] Micro Mapping, was Race track

John F. Eldredge john at jfeldredge.com
Mon Feb 1 02:42:15 GMT 2010

It may be difficult to obtain GPS equipment that has accurate altitude data.  The GPS satellite system is maintained by the US military, and I have read that the altitude information available to civilian equipment has deliberate errors, in order to make it harder for terrorists, or non-US militaries, to use that equipment to plan out artillery attacks in advance.  The equipment used by the US military makes use of a more accurate, but encrypted, altitude signal.  In the US, at least, such equipment is classified and not legally available to civilians.

John F. Eldredge -- john at jfeldredge.com
"Reserve your right to think, for even to think wrongly is better than not to think at all." -- Hypatia of Alexandria

-----Original Message-----
From: John Smith <deltafoxtrot256 at gmail.com>
Date: Mon, 1 Feb 2010 12:10:59 
To: Tag discussion, strategy and related tools<tagging at openstreetmap.org>
Subject: Re: [Tagging] Micro Mapping, was Race track

The only other problem left to solve is the 3D bit, elevation could be
added to nodes as well, but all we need then is GPS equipment that has
more accurate elevation.

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