meaning of .err file entries

[Carlos "Guâno" Grohmann]

Many thanks

carlos




On Thu, Nov 6, 2008 at 19:21, Olly Betts <olly at survex.com> wrote:
> On Thu, Nov 06, 2008 at 04:07:03PM -0200, Carlos Guâno Grohmann wrote:
>> Sorry for the basic question, but could someone explain what each of
>> the entries in the .err files mean? like, in this loop:
>>
>>
>> bethary.11 - bethary.12 - bethary.10 - bethary.08
>> Original length  13.27m (  3 shots), moved   0.43m ( 0.14m/shot). Error   3.27%
>> 2.792811
>> H: 0.517322 V: 5.062685
>>
>>
>>  what is the meaning of the 2.792811?
>> and the H and V? are they horizontal and vertical displacements?
>
> OK, these three numbers are an indication of how bad the misclosure is.
> The key thing about them is that they take into account the centre-line
> error model, so they're much more useful statistics that the percentage
> error or the misclosure per shot.
>
> So the 2.792811 is the actual misclosure for this traverse divided by
> the expected misclosure.
>
> The H and V values are the same thing, but only looking at the
> horizontal or vertical components of the errors.
>
> Less than one is theoretically what you're after for all three of these
> numbers, but the model tends to be a bit optimistic in reality it seems.
>
> In this case, the error is clearly in the vertical - the horizontal is
> fine.  So it's probably a reversed clino (wrong sign), a misread clino
> on a non-steep leg, or an error in the tape reading on a plumbed leg.
>
> Cheers,
>    Olly
>



-- 
+-----------------------------------------------------------+
              Carlos Henrique Grohmann - Guano
  Geologist M.Sc  - Doctorate Student at IGc-USP - Brazil
Linux User #89721  - carlos dot grohmann at gmail dot com
+-----------------------------------------------------------+
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