[Therion] standard deviation and survey grade

[Martin Budaj]

On Mon, Nov 24, 2008 at 8:25 PM, Bruce Mutton
<bruce.mutton at paradise.net.nz> wrote:
> Seems OK as a start.  Agree that the elevations are often less accurate than
> the plan positions...
> Just to clarify, are the values listed to be 2x sd (mean to 95% limit)
> Or 4x sd (lower 95% limit to upper 95%)?

It is meant to be 2 * SD.

Duncan: basically it is EPE with 95% confidence.

Martin