[Therion] Fix station point using only 2D

[Xavier Pennec]

The altitude needs indeed to be given, but you should also specify that 
it is highly unreliable by giving it a every high standard deviation, like:
fix MyRadioLocation   accurate_x_coord   accurate_y_coord 
approximate_altitude 3 3 1000 # stddev of 3m in x and y and 1000m in z
This should guaranty that this fixed station will not have a big 
influence on the altitude in the loop error compensation algorithm.

Xavier


Le 21-Aug-18 à 12:22, Martin Sluka via Therion a écrit :
> Add label altitude to that station and use it.
>
>
> Odesláno z iPhonu
>
> 21. 8. 2018 v 11:46, Henry.Bennett--- via Therion <therion at speleo.sk>:
>
>> Assuming that you've got another fix for the entrance then you should be able to get the height for the end station.  Just look at the .3d file.  That will give you the relative altitude at the end - just use that.
>>
>> Henry
>> -----Original Message-----
>> From: Therion <therion-bounces at speleo.sk> On Behalf Of Adam Pyka via Therion
>> Sent: 21 August 2018 10:42
>> To: therion at speleo.sk
>> Cc: Adam Pyka
>> Subject: [Therion] Fix station point using only 2D
>>
>> Hi all,
>>
>> How to 'fix' the survey station point (to morph the cave plan) having only 2D coordinates?
>>
>> Using the radiolocation we get (with quite good accuracy) the station point position which is about 150m beyond the estimated location we get from surveying. So now I wanted to use this position to make a correction to the main polygon. But the 'fix' command need a 3D coords so how should I do that (no, there is no point to measure the depth by radiolocation by some reasons).
>>
>> Thanks in an advice,
>> Adam
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> Xavier Pennec
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