Differentiating splay measures in Aven

[Olly Betts]

On Fri, Feb 07, 2020 at 05:20:54PM -0500, Luc Le Blanc wrote:
> I export splay measures creating anonymous stations by suffixing the
> original station name. Here's an excerpt of survey shot BA.0-BA.1, its
> LRUDs and then its splay measures:
> 
> *data normal from to length compass  clino
>          BA.0          BA.1     18.79    60.9      -2.1
> *data passage station left right up down
>          BA.1    3.55    3.21    2.14    0.10
> *flags splay
> *data normal from to length compass clino
>          BA.0          BA.0.1    8.42   57.10   -0.90
>          BA.1          BA.1-2    6.37   41.70    1.10
>          BA.1          BA.1-3    4.02   97.90    1.50
>          BA.1          BA.1-4   10.20   73.40    2.10
>          BA.1          BA.1.5    5.15  254.00    4.10
> *flags not splay

(Aside: I notice splays get 2 decimal places on the compass and clino
but normal legs only get 1 decimal place - presumably that's not
intentional?)

With the above "*alias station - .." isn't relevant as these aren't
really anonymous stations.  "BA.1-2" is just a normal station called
"1-2" in survey "BA" and "BA.0.1" is a station called "1" in subsurvey
"0" in survey "BA".

But I'd suggest making use of the anonymous station feature Wookey
described, and then the above would be:

*data normal from to length compass  clino
*alias - ..
         BA.0          BA.1     18.79   60.9    -2.1
         BA.0          .         8.42   57.10   -0.90
         BA.1          -         6.37   41.70    1.10
         BA.1          -         4.02   97.90    1.50
         BA.1          -        10.20   73.40    2.10
         BA.1          .         5.15  254.00    4.10
*data passage station left right up down
         BA.1    3.55    3.21    2.14    0.10

That gets rid of all the invented station names, and the weirdness
that BA.0 and BA.1 are each both a station and survey (which Survex
doesn't actually support but it seems the check to catch it doesn't
trigger in this case for some reason).

Those legs would then be automatically flagged as splays (so no need to
toggle the "splay" flag) and the "-" end points marked as being a wall
(in your current version nothing gets marked as a wall).

Anonymous stations were added in Survex 1.2.7 which was released
2013-07-27 so everyone should have them available now.

Better still would be to export with a proper survey structure rather
than repeating "BA." in front of every station name:

*begin BA
*data normal from to length compass  clino
*alias - ..
         0          1        18.79   60.9    -2.1
         0          .         8.42   57.10   -0.90
         1          -         6.37   41.70    1.10
         1          -         4.02   97.90    1.50
         1          -        10.20   73.40    2.10
         1          .         5.15  254.00    4.10
*data passage station left right up down
         1    3.55    3.21    2.14    0.10
*end BA

That would be more helpful for people wanting to integrate the exported
file into an existing dataset.

Cheers,
    Olly