Use some common sense. Right decision but I would have given it a goal.
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It doesn't solve the problem at all, you still have the perspective problem where you are viewing the line at an angle. The moment you get off that line you are doing little better than guessing.Need four goal umpires each standing just behind the posts and not moving. That gets rid of 99% of the problems. Two can confer on whether the ball crossed the line, they don't get into the players way, they are in best position immediately to see which side of the post a ball went through etc etc.
Problem solved.
not to mention, the shadow isn't being cast directly out from the goal, but instead on an angle, so the 44cm isn't the direct distance between the umpire and the goal line in any case
I really don't think anything clear can be drawn from analysing a shadow on an angle, starting from the wrong foot for what we're interested in, and with only footage on an unhelpful angle available, but, within those parameters, I'd still say it looks as though he's prevented the ball from fully crossing the line.
Sorry, but that is wrong. The length of the shadow behind the line is obviously much longer than 44cm, to the same ratio that the length of the whole shadow is longer than the umpire's height. The fact that the shadow is being cast at an angle is accounted for by this ratio.
I would agree that nothing clear and decisive can be drawn from from the photo because of insufficient information, but you are wrong about being concerned over the angle (the effect of the angle is accounted for by using ratios). Perhaps if you had studied some aspects of engineering drawing and perspective for at least a year as I have you might follow this better.
I would contend that analysing the bulk of the evidence with a correct understanding of perspective and projections, on balance it looks as though the ball did fully cross the line.
Which is what I said in the very first place. Unlike you I have actually got some evidence to back up my view, and through my education at least some appreciation of how to properly evaluate that evidence.
Let's assume we have a 2m tall goal umpire, standing directly in the middle of the goal and a metre back from the line, casting a 5m-long shadow directly forward (the sun is directly behind the goal umpire). By your logic, we simply take the 5:2 ratio, and say the umpire is behind the line by 40% of his body height, which is 80cm: an erroneous conclusion.
Your principle is "The ratio of the umpire's height versus the whole length of the shadow is necessarily the same ratio as the distance the umpire is behind the line versus the length of the shadow behind the line." - but with the scenario I've presented, the length of the shadow can still vary (based on the position of the sun) yet the length behind the line remains the same (1m of the shadow is behind the line, whether the whole shadow is 1.1m or 5m or 20m or whatever), when for your axiom to be correct that can't be the case. There's something clearly amiss here.
Is this really so hard to grasp for you? My oh my some people must really have no ability at all in some subjects like math and geometry.
What? You are horribly confused. If the goal umpire is 2m tall and his shadow on the ground is 5m long because of the angle of the sun with respect to the ground, and only 1m of his shadow is behind the goal line, the distance of shadow (along the ground) from his feet to the goal line compared to the total length of shadow along the ground will be 5:1 or 20%. This will be the case no matter what direction the shadow runs in. You have got the two factors mixed ... you get the ratio of shadow length 1 to shadow length 2 and use it to infer height 1 to height 2, you don't cross-mix a height with a length along the ground. Boy are you ever confused.
If the direction of the sun is such that it casts a shadow at 45 degrees, so that the shadow is the same length along the ground as the umpire is high, and the 2m tall umpire is standing 1m behind the goal line, then 50% of the length of the shadow along the ground will be behind the line (in this case the shadow is perpendicular to the goal line). Later in the day if the direction/angle of the sun changes such that the shadow is now 10m along the ground (five times as long as before) and the umpire is standing in the same place, then only 10% of the length of the umpire's shadow along the ground will be behind the goal line.
Edit: Sorry that underlined bit was wrong, you have got me confused now. The percentage of the shadow behind the line will still be 50% ... but the angle will be very different. To get 50% of a 10m long shadow behind the line it would have to be running along the ground at a very oblique angle to the goal line.
Now that is embarrassing given that I too got confused and made a mistake. Oh dear. I offer you my sincere apologies.
what I do say is that if 25% of the length of the shadow is behind the line (no matter how long the actual shadow is) this means that the umpire must be behind the line by 25% of his height.
Well, no actually, I think you had it right the first time - or, at least, it depends on in what way you change the angle of the sun. If we assume that, by some convenience, the sun is descending directly in line with the umpire, then his shadow will elongate without the angle it's on changing, surely? And if that's the case, and we assume that angle to (again, conveniently) be directly perpendicular to the goal line, then there would indeed be only 10% of the shadow behind the line.
havent read through the thread, just thought i would comment that im not surprised that 1 in 4 bigfooty users is an idiot.
If the umpire is 2m tall and standing 1m behind the goal line and the shadow is always perpendicular to the boundary line as the sun's angle changes (west is directly behind the umpire) then you would have the following situations as the time of day gets later:
(1) if the shadow cross the boundary line at 50% of the shadow, then the shadow will be 2m long altogether (sun is at 45 a degree angle).
(2) if the shadow cross the boundary line at 25% of the shadow, then the shadow will be 4m long altogether.
(3) if the shadow cross the boundary line at 10% of the shadow, then the shadow will be 10m long altogether.
(4) if the shadow cross the boundary line at 5% of the shadow, then the shadow will be 20m long altogether.
The ratios still work.
Common sense is not your strong point is it... Either that or you don't give a stuff about what's fair and just.I am actually surprised that only 3/4 don't know the rules of the sport they watch, would've thought it'd be more.
For those that think common sense has no place on the field.
Have a read. The jist was we couldn't leave a "common sense" decision to the umpires because it was too subjective. A "rule" must be applied......Who's said that so far?
Common sense is not your strong point is it... Either that or you don't give a stuff about what's fair and just.
I did read. The tweet you posted didn't have anything to do with umpires making decisions on the field about what rules to ignore based on common sense. It's about a rule change by the league.Have a read. The jist was we couldn't leave a "common sense" decision to the umpires because it was too subjective. A "rule" must be applied......
I just can't understand the mentality of anybody who thinks it was right for that goal to be disallowed. Even the bloody AFL themselves have admitted there needs to be a rule change. This thread should be locked already.
It of course follows from the above points that your point about angled shadows is similarly flawed.
Remember here that we are trying to measure distance: the distance the umpire is from the line still needs to be measured perpendicular to the line, even though the shadow is cast on an angle.
I just can't understand the mentality of anybody who thinks it was right for that goal to be disallowed. Even the bloody AFL themselves have admitted there needs to be a rule change. This thread should be locked already.