[Therion] loop misclosure error distribution

[Cepe]

I'm not a super-expert...but this is exactly what I'm looking for.
In this case I will use the 'fix' directive but in other cases, using sd (or
grade) directive, I can force misclosure error to be distributed with a
different weight and with sd directive I can do this with a very high
detail.
Thanks!!! and ops...sorry, the answer was in the manual...


Andrew Atkinson wrote:
> 
> Cannot
> 
> sd <quantity list> <value> <units>
> 
> be used to do the same thing?
> 
> From teh survex manual
> 
> SD
> 
> Syntax
> 
>     *sd <quantity list> <standard deviation>
> Example
> 
>     *sd tape 0.15 metres
> 
> Description
> 
>     *sd sets the standard deviation of a measurement.
> 
>     <quantity> is one of
> TAPE|COMPASS|CLINO|COUNTER|DEPTH|DECLINATION|DX|DY|DZ
> 
>     <standard deviation> must include units and thus is typically "0.05
> metres", or "0.02 degrees". See *units below for full list of valid units.
> 
>     To utilise this command fully you need to understand what a standard
> deviation is. It gives a value to the 'spread' of the errors in a
> measurement. Assuming that these are normally distributed we can say
> that 95.44% of the actual lengths will fall within two standard
> deviations of the measured length. i.e. a tape SD of 0.25 metres means
> that the actual length of a tape measurement is within + or - 0.5 metres
> of the recorded value 95.44% of the time. So if the measurement is 7.34m
> then the actual length is very likely to be between 6.84m and 7.84m.
> This example corresponds to BCRA grade 3. Note that this is just one
> interpretation of the BCRA standard, taking the permitted error values
> as 2SD 95.44% confidence limits. If you want to take the readings as
> being some other limit (e.g. 1SD = 68.26%) then you will need to change
> the BCRA3 and BCRA5 files accordingly. This issue is explored in more
> detail in various surveying articles.
> See Also
> 
>     *units
> 
> Andrew
> 
> On 14/11/12 09:25, Cepe wrote:
>> 
>> Essentially I need this feature to handle a loop with a part in a
>> quarry/mine, with data collected with a total station that i would
>> maintain
>> fixed, and part formed by a cave intersecting the mine.
>> I think that I can do this with a little workaround (I think but I'm not
>> sure of this), calculating only the mine's data, getting the GPS fix
>> (calculated) of the intersection stations and then recalculating the
>> entire
>> survey with this station fixed but is a long work.
>> Reading the Survex manual i founded a SOLVE command that seemed usable
>> for
>> my purpose so, before taking this way, I asked... ;)
>> 
>> 
>> Stacho Mudrak-5 wrote:
>>>
>>> Not yet, it should be implemented.
>>>
>>> What for do you need this feature?
>>>
>>> We created therion to avoid doing things like this :)
>>>
>>> Regards, S.
>>>
>>> On 13 November 2012 20:08, Cepe <ron7170 at iperbole.bologna.it> wrote:
>>>
>>>>
>>>> Hi!
>>>> it is possibile to force Therion to compute one part of a loop
>>>> and then to compute the remain part keeping the first computed part
>>>> fixed
>>>> or, in other words, to distribute the misclosure error only in the
>>>> second
>>>> part of the loop?
>>>>
>>>> Sorry for my very poor english.
>>>> Regards,
>>>> Fede
>>>> --
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>> 
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