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Index of Subjects 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 > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.432 / Virus Database: 268.17.30/674 - Release Date: 2/7/2007 > 3:33 PM > >
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