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Index of Subjects Your welcome Jamie. I found it some time ago when researching another issue. Also, I sent a query re your elevation question, but have yet to get a reply. Ray ----- Original Message ----- From: "Jamie Simpson" <jsimpson@win.eastlink.ca> To: <naturens@chebucto.ns.ca> Sent: Saturday, February 10, 2007 11:07 AM Subject: Re: [NatureNS] Determining Elevation > 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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