Survex question

[Olly Betts]

On Thu, Mar 15, 2007 at 11:08:45AM +0000, Dave Nixon wrote:
> Therefore I am thinking of doing the survey from 
> two absolute points on the surface (GPS derived) 
> and taking the survey underground by measuring 
> angles. Can survex accept data in this fashion to 
> create co ordinates output drawings?

It doesn't currently.  Turned angle surveys are a feature we've always
intended to add (since it is a standard technique), but I don't believe
anyone has actually asked for it before, so it's never been very high
priority so far.

Am I right in thinking you're plan is to just rely on the GPS points
to provide the "rotational reference", rather than measuring an
"angle from north" for the leg at the start and/or end of the traverse?

Do you (or anyone else) have any sample data already?

Cheers,
    Olly