Left, right, up, down

[John Halleck]

On Tue, 11 Nov 2003, Philip Maynard wrote:

> Date: Tue, 11 Nov 2003 08:52:43 +1100
> From: Philip Maynard <philip.maynard@uts.edu.au>
> To: Survex User Group <survex@survex.com>
> Subject: Re: Left, right, up, down
> 
> On Tuesday, November 11, 2003, at 03:44  AM, John Halleck wrote:
> 
> >
> >  And, back in the years that this used to be debated dayly, you also 
> > don't
> >  know if it was measured perpendular to incomming, outgoing, or whether
> >  it was the average of the two.
> >
> 
> What our club has always done is to record two sets of LRUD data for 
> any continuing station - a set perpendicular to the incoming leg and a 
> set perpendicular to the outgoing leg.  We record one set for beginning 
> and one set for dead end stations.  This gives us a lot of information 
> about the shape of corners in passages.  Junction points wind up with 
> more than two sets of LRUD - even better for specifying chambers, etc.

  This is *EXACTLY* what we ended up doing in Little Brush, but we used
  the notation x/y  for   x in, and y out.
  For example, for a point on a lip, and an order L R F C
          5.2  6.1  2.7/8.8   3.5
  If the program saw one number, it assumed it applied to both,
  if it saw x/y it assumed x incomming and y outgoing.

> Phil