[NatureNS] Determining Elevation

Date: Sat, 10 Feb 2007 10:09:52 -0400
From: Ray Dempsey <canadaharbour@eastlink.ca>
To: naturens@chebucto.ns.ca
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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.
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>> 3:33 PM
>>
>>
> 

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