> > > > > > I didn't see the incident, but the near side line is the only
> line that
> > > > > > the
> > > > > > umpire can see AT LEAST as well as the linesman.
> > > > > You're overlooking the most important consideration of the
> umpire's view:
> > > > > the angle.
> > > > I agree with you, that is, that there is parallax error from the chair
> > > > umpire.
> > > > The parallax error is the _least_ on this particular line.
> > > > James.
> > > The umpire's view of the line directly below him is the worst view he has
> > > of any line on the court. He can only see the ball traveling in a
> > > straight line, even as it's bouncing. Exactly where it bounced is a very
> > > difficult determination to make. Coupled with the fact that he is to the
> > > outside of the line, his view of the ball can make it look on the line
> > > when it is, in fact, outside the line.
> > And on all the other lines he can see when it bounced, but has no real
> > idea
> > where on the court it bounced. This is born out by over-rules being
> > VERY
> > seldomly applied on the far side-line, and infrequently on the baseline.
> This is simply not true. The court is only 78x27, and even the furthest
> point from the chair is not very far. With normal vision, the vantage
> from the chair is excellent for each line. If there are linespeople much
> closer to those lines than the chair, their calls naturally carry more
> weight, but that is not to suggest that the chair "has no real idea where
> on the court it bounced".
> In many professional (and amateur) tennis tournaments, the chair umpire
> calls all the lines. In others, there are a couple of sideline judges,
> with the chair calling the service and baselines. Certainly the chair has
> a much better view of every ball than both competitors, and in most of
> tennis played in the world, the competitors call their own lines.
> The hardest line for the chair to call is the one right below him/her.
field of view, parallax distortion and pixellation. I could also give
my personal experience as chair umpire of quite a number of matches, and
line umpire of a number of matches. I could even describe the
system for you, and explain those factors which have highest
sensitivity, and those factors which have a low psychovisual
It would take too long to be worth it, and you would probably disagree
I'll just repeat... there are strong reasons why the closest side line
easiest line to call from the chair.