[Therion] Wrong average calculation from compass/backcompass data

[Footleg]

The correct way to average bearings is to the treat them as vectors, then
average the x and y components separately before converting the resulting
vector back to a bearing. It is likely this is what the trig functions
mentioned in this thread are doing.

Footleg
On Fri, 18 May 2018 at 12:57, Bruce Mutton via Therion <therion at speleo.sk>
wrote:

> I agree to some extent with both sentiments below, however the software
> should not abort just because of backsight discrepancies.
>
> What about adding one more line to the Therion and or Survex log file;
> either
>
> “There are no backsights in the centreline”, or
>
> “Maximum backsight discrepancy is xx [degrees|grads]”, as approprite
>
> That way the user can be fully informed and make their own decision about
> whether to investigate further if the information is not what they expect.
>
> Bruce
>
>
>
> 17. 5. 2018 v 9:25, Evaristo Quiroga via Therion <therion at speleo.sk>:
>
>
>
> In this case is not a problem with my formula, is a serious magnetic
> anomaly (100 degrees difference)  and the program should to stop and to
> send a warning.
>
>
>
> Evaristo,
>
>
>
> Therion is a program to interprete your data, not to solve problems with
> your data.
>
>
>
> It is your responsibility what the data you import into Therion.
>
>
>
> Martin S.
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> Therion at speleo.sk
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>
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