[Therion] weight on distorsion depending on survey

[Ben Cooper]

Hi Phil,
Yes, you can do that by setting the standard deviation for the survey as a whole, and then for each leg that requires it.

>From the Therion book:

sd <quantity list> <value> <units> ◃ sets the standard deviation for the given
measurements. The Quantity list can contain the following keywords: length, tape,
bearing, compass, gradient, clino, counter, depth, x, y, z, position, easting, dx, northing,
dy, altitude, dz.

The sd command affects all following legs, so for a single leg, remember to set the sd back to your default again, eg:-
sd compass 5 degrees
sd clino 2 degree
1 2 209 10.88 -4
sd compass clino 0.5 degrees

A small difference in SD makes a big difference in the distribution of error, so suggest experiment with different values.
Best regards,
Ben

-----Original Message-----
From: Therion [mailto:therion-bounces at speleo.sk] On Behalf Of Philippe Vernant via Therion
Sent: 14 February 2017 23:34
To: List for Therion users
Cc: Philippe Vernant
Subject: [Therion] weight on distorsion depending on survey

Hi guys,

Could not find the answer, so popping up to ask you the question. Is there a way to say that one survey should bear most on the distorsion ? I have a diving survey which is less accurate than the “regular” surveys, can I put some weight on that survey so it will be more distorted ?

Thanks,
Phil

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