TMG-L Archives

Archiver > TMG > 2011-02 > 1297693395


From: Richard Webb <>
Subject: Re: [TMG] Latitude and Longitude Conversion
Date: Mon, 14 Feb 2011 09:23:15 -0500
References: <c2caeedc48c24dbf5e1158c89fb3a615@imap.olypen.com> <0AE7D6226F9D4BC6BE34CA3A517FCA22@jfc><1544844003.20110213231219@comcast.net>
In-Reply-To: <1544844003.20110213231219@comcast.net>


Most GPS units don't have the accuracy that we are talking about here.
I know when I go Geocaching, the best you can get is +/- 15meters. If
someone is using Google Earth or the like for position, I expect the
accuracy to be even less. If you are using a GPS to give the position,
you should be using it in the averaging mode and letting it average for
several hundred readings.

Dick
> Sunday, February 13, 2011, 10:10:42 PM, John Cardinal wrote:
>
> JC> When I tried it, TMG converted "41.59364,-76.05723" to "413537N0760326W". If
> JC> you convert "413537N0760326W" back into decimal degrees notation, you get
> JC> 41.593611,-76.057222, which is not the same as the input value. In this
> JC> specific example, only a small amount of precision is lost, and if you are
> JC> recording the location of a cemetery or a building or something like that,
> JC> you could afford to lose that amount and some more with no significant loss
> JC> of information. If you are trying to record the location of a grave,
> JC> however, you may not be able to afford the loss of precision.
>
>
> At 41° N, one second of longitude is about 20m, and one second of
> latitude is about 30m. Using decimal degrees, a change of one in the
> fifth place after the decimal point is about 1/3 of that.
>
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