[NatureNS] Determining Elevation

Date: Sat, 10 Feb 2007 11:07:50 -0400
From: Jamie Simpson <jsimpson@win.eastlink.ca>
To: naturens@chebucto.ns.ca
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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
>>>
>>>
>>> -- 
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>>> 2/7/2007 3:33 PM
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>>>
>>
>
>
> -- 
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> 4:06 PM
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