[NatureNS] Determining Elevation

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Date: Thu, 8 Feb 2007 09:30:07 -0800 (PST)
From: Paul MacDonald <paulrita2001@yahoo.com>
To: naturens@chebucto.ns.ca
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Hi Peter and All
Its is interested to note that once when in Fundy
Park, NB I saw a sign that said "Elevation 394M".
I got out my GPS and its said elevation 394 m also. I
wonder where the folks who put up the sign got the
elevation?
Have a good winter - Hope you see a butterfly soon!
Paul

--- Peter Payzant <pce@accesswave.ca> wrote:

> Hi, Jamie-
> 
> Elevation measurements from GPS are significantly
> less accurate than 
> lat-long measurements. This is due in part to the
> geometry of the situation, 
> and in part due to the fact that the GPS system
> calculates your distance 
> from the centre of a sphere, and then applies a
> model of the earth's surface 
> to correct for the earth's radius at your location.
> There are other sources 
> of error as well.
> 
> There's lots about this on the net of course. Until
> you understand the 
> nature of the errors it's probably not a good idea
> to put too much faith in 
> what the GPS receiver tells you for elevation.
> 
> If you wanted to get a good result, you could rent a
> surveyor's level and 
> work your way up to your house from the nearest
> known accurate elevation.
> 
> Peter Payzant
> 
> 



 
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