As it was technology helped us, the goal would not have been given if it was left to the officials. So far this Hawkeye for football has been freakishly accurate, but then again it tracks 130mph tennis balls on 5 inch lines and is approximately 50 times more accurate than infrared heat signatures in cricket.
We know about the 30-odd visual cameras but it is the radar waves, approx a thousand bursts a second which is near the standard of broadcast radio (radar is a form of radio), that knows where the balls are to the fraction of a millimetre. It also measures speed but as there are contracts with other companies for their tech they can't use it for that, Hawkeye is accurate to picometre per month... that is, it can tell you how long an object will travel in 30 days down to the picometre! For us to comprehend as a value it would say something like a tennis ball was travelling at 129.83749274845mph. Think of it as thousands of invisible light waves heading to the ball, bouncing off into multiple receivers around the court at the speed of light.
You could see in the game tonight those officials had no idea it was a goal, and I believe the Ospina genuinely believed it didn't cross the line. Check the replays and it happens so quickly, but this technology knew exactly where it was, how fast it was travelling and exactly the direction it was going beyond the comprehension any person could begin to fathom.
I am so happy that it was used in this game