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Index of Subjects Jamie, Have a look at this sight: http://www.vendian.org/envelope/dir1/contents.html At the bottom of the page you'll see "Body Ruler" and "Measuring Angle and Distance with your Thumb" Have fun. Ray Dempsey ----- Original Message ----- From: "Jamie Simpson" <jsimpson@win.eastlink.ca> To: <naturens@chebucto.ns.ca> Sent: Saturday, February 10, 2007 9:17 AM Subject: Re: [NatureNS] Determining Elevation > 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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