Fixing the same point multiple times on different dates

[Olly Betts]

On Thu, Sep 10, 2020 at 10:42:56PM +0100, Tarquin Wilton-Jones wrote:
> Survex refuses (unless I am mistaken) to allow multiple fixes per
> station.

You can't specify multiple exact fixes with different coordinates
(as that would be contradictory) but you can provide multiple fixes if you
specify error details, for example:

$ cat multifix.svx 
*fix 1 0 0 0 5 5 6
*fix 1 1 0 2 5 5 6
*fix 1 0 1 4 5 5 6
$ cavern multifix.svx 
Survex 1.2.42
[...]
Survey contains 1 survey station, joined by 0 legs.
There are 0 loops.
Total length of survey legs =    0.00m (   0.00m adjusted)
Total plan length of survey legs =    0.00m
Total vertical length of survey legs =    0.00m
   1 3-node.
CPU time used  0.00s
$ 3dtopos multifix.3d
$ cat multifix.pos 
( Easting, Northing, Altitude )
(    0.33,     0.33,     2.00 ) 1

A station can also have one exact fix and multiple fixes with errors specified
(then the exact one will win and the others are effectively ignored.)

Cheers,
    Olly