[NatureNS] Determining Elevation

Date: Sat, 10 Feb 2007 13:19:05 -0400
From: Ray Dempsey <canadaharbour@eastlink.ca>
To: naturens@chebucto.ns.ca
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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.
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>>>>
>>>
>>
>>
>> -- 
>> No virus found in this incoming message.
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>> 4:06 PM
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> 

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