[NatureNS] Determining Elevation

Date: Sat, 10 Feb 2007 09:17:10 -0400
From: Jamie Simpson <jsimpson@win.eastlink.ca>
To: naturens@chebucto.ns.ca
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Peter

Are you aware of a method of determining distance of a visible object other 
than actually measuring or using a transit?

If I could do that I think I could figure it out mathematically.  But I 
don't think it can be done.


----- Original Message ----- 
From: "Peter Payzant" <pce@accesswave.ca>
To: <naturens@chebucto.ns.ca>
Sent: Thursday, February 08, 2007 12:38 PM
Subject: Re: [NatureNS] Determining Elevation


> 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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> 3:33 PM
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> 

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