I just checked on my little experiment of some years ago, and I
misrepresented it.
> PocketTopo automatically detects backsights if they are taken immediately
after a foresight. So the software handles the station naming, no user
intervention required.
That much is true. You end up with somethi
Thanks Bill for pointing that out. BACKTAPE/BACKLENGTH reading support was
added to therion in the latest commit.
S.
On Thu, 30 Dec 2021 at 09:44, Bruce Mutton wrote:
> > instead Toporobot just generates a new station for the backsite.
>
> PocketTopo automatically detects backsights if they are
> instead Toporobot just generates a new station for the backsite.
PocketTopo automatically detects backsights if they are taken immediately after
a foresight. So the software handles the station naming, no user intervention
required. While I processed the only survey I ever did this way with
On Mon, Dec 27, 2021 at 05:04:20PM -0600, Bill Gee wrote:
> My question about significant digits is really related to how much
> precision can and should be carried through a calculation. If compass
> readings are taken to four significant digits, then the mean of two
> such numbers is really only
Hi Olly -
Many thanks for the answers. I think I will give BACKTAPE a try the next time
I do some survey, if only to see what happens.
My question about significant digits is really related to how much precision
can and should be carried through a calculation. If compass readings are taken
t
On Sun, Dec 26, 2021 at 08:00:49AM +, Ben Cooper wrote:
> What does Survex actually do for all these loops?
It deal with any backsights up front and just adds a single link to the
network for each survey leg.
It's harder to properly account for partial backsights if we created a
separate link
On Sat, Dec 25, 2021 at 08:50:26AM -0600, Bill Gee wrote:
> 1) Does Therion also recognize the BACKTAPE data type?
It seems not - there's no match in the source code repo for:
git grep -i BACKTAPE
> 2) What does Survex do if both TAPE and BACKTAPE are given? Does it
> average the two readings?
On 27/12/2021 19:41, Tarquin Wilton-Jones via Therion wrote:
But because DistoX is an electronic device it is only way to be sure it
works properly. The same as check, if three (four) readings for
surveying leg with rotation around the longitudinal axe of DistoX are in
tolerance interval.
Oh v
On 27/12/2021 19:15, Martin Sluka via Therion wrote:
>
>
>> 26. 12. 2021 v 19:32, Tarquin Wilton-Jones via Therion
>> mailto:therion@speleo.sk>>:
>>
>> However, for Disto
>> surveying, it feels largely unnecessary, as the accuracy is already a
>> lot more than most surveys need when just using fo
Ben's comment about backshots being a form of loop is interesting. I had not
though of it that way, but he is right!
I do not use electronic sketching in a cave. All the data from the DistoX2
goes on paper just like Suunto/tape data. I have looked at Qave and TopoDroid,
and for now I think t
> 26. 12. 2021 v 19:32, Tarquin Wilton-Jones via Therion :
>
> However, for Disto
> surveying, it feels largely unnecessary, as the accuracy is already a
> lot more than most surveys need when just using forward sightings.
But because DistoX is an electronic device it is only way to be sure it
> when I do I always do a full reading
A splay is useful only for immediate error checking on the data
gathering device (magnetic or calibration), but cannot be used for
automatic error correction unless the app can do it for you (like
SexyTopo can, but only for opposing splays, not for opposing l
Hi Bill, et al,
I’ve always thought that backsites didn’t need specific handling as effectively
they form a small loop so would be handled by the loop averaging.
I don’t often do backsites, and get reasonable accuracy without (as good as
0.5%, depending on conditions). But when I do I always do
Hello everyone -
I have a holiday question for the group. We have for years done our survey
shots both directions, obtaining a forward and backward reading for both
compass and inclinometer. The two readings are averaged by Survex and Therion
in an effort to reduce errors. The tape reading,
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