[Therion] equate two (or more) fixed stations

Xavier Pennec xavier.pennec at inria.fr
Sun Jan 1 12:04:11 CET 2012


Hi bruce

My solution to this problem is to equates the two fixed stations to a third one which is not fixed

Xavier

Envoyé de mon iPhone

Le 1 janv. 2012 à 01:44, Bruce <bruce at tomo.co.nz> a écrit :

> Happy New Year!
>  
> I’ve just tried to equate some fixed stations that have been defined a bit like this;
>  
> fix 809 2502023 6021519 594      4 4 12
>  
> but I get errors from therion like this;
>  
> error -- equate of two fixed stations -- 809 at NSpots.NgaruaArea and A1 at a.Kairuru.NgaruaArea
>  
> These represent gps fixes taken at the same place on various occasions and part of various overland surveys.
>  
> At first look it seems like this might be a desired response from Therion.  How can two stations with specified and differing co-ordinates be ‘equal’?
> My assumption was that the standard errors give the actual position of the station a degree of uncertainty or ‘fuzzyness’, and that by equating two such stations they would be ‘averaged out’ in a similar way to loop closures or two fixed stations connected by a survey network.  But it seems I might have assumed wrong.
>  
> Is it part of therions design to allow equating a number of fixed stations? 
> By using alternative syntax or connecting the stations with a dummy survey leg with large std error perhaps?
>  
> Bruce
>  
>  
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