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From: Noob on 19 Feb 2010 05:40
Rich Webb wrote:

> Frank Buss wrote:
>
>> I guess it would be difficult to get 1 m accuracy with a 10 km measuring
>> tape (non-planar ground, tape stretching etc.).
>
> It also depends on what one considers distance to be. Is it the straight
> cord between the points? Or the great circle distance?

IIUC, the latter is also called orthodromic distance.

http://en.wikipedia.org/wiki/Great-circle_distance

> Or the measured ground distance?

Taking into account terrain features, you mean?
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