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Index of Subjects Ray that is one cool site. I showed it to my wife who teaches grade 6 and she plans to use it in class. Thanks! ----- Original Message ----- From: "Ray Dempsey" <canadaharbour@eastlink.ca> To: <naturens@chebucto.ns.ca> Sent: Saturday, February 10, 2007 10:09 AM Subject: Re: [NatureNS] Determining Elevation > 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 >>> >>> >> > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.441 / Virus Database: 268.17.33/678 - Release Date: 2/9/2007 > 4:06 PM >
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