Several companies have developed specialized tracking systems for collecting real-time data from different types of sports. These tracking systems are now used by broadcasters to add graphics elements that are "registered" or
"locked on" to the video. An early example is the Sportvision's FoxTrack hockey puck tracking system which allows the broadcaster to render glows or streaks where the hockey puck appears in the video frame.
More recently Sportvision has developed a system for rendering a virtual "1st and 10" line now used in many NFL broadcasts. Another form of registered graphics enhancement, also targeted towards sports broadcasts, is the insertion of images (typically advertising logos) registered to physical surfaces at the event site (e.g., the playing field, existing billboards). Orad and Princeton Video Image are among the pioneers of this technique. As a recent example, in NBC broadcasts from the summer Olympics in Sydney, shots of the swimming events had flags inserted into the swimming lanes to help viewers identify the competitors.
Extremely accurate camera tracking is the basis for inserting registered graphics in live video. Camera tracking equipment is well known from virtual studios  and special-effects work, however live production with highzoom cameras, as is common for sports, adds to the challenge of collecting accurate camera data.
Comment: good luck finding a detailed explanation on the internet of how it's done exactly. If somebody does, please share. It would be interesting to know.
The answer to this question can also be found here:
How do the Olympics make the flag images appear in the swimming pool
It's done just like with Football games. The technology we have today is awesome, huh?
It is video overlapping. It was used for the Sydney games as well.
Im Pretty sure that it is projected because if you sort of look closely when the divers dive in you can see the light go on there back!
Also, they have very high technology that is set so that when the pad gets hit the projecter turns on but only for the first person that hits the touchpad!
It is computer generated.
The National Motivational Times allows swimmers to gauge how well they are swimming compared to other swimmers of the same age group and sex throughout the country, and shows them at what level they are swimming. Times are listed for Long Course meters, Short Course meters, and short course yards. Times are from the USA Swimming Web Site.
The USA especcially with Michael Phelps.
im not positive but since the olympic games originated in Greece then i would believe that since swimming was an event then, that is where it started as a sport I think that isn't true because swimming wasnt there back in Greece then
united states of America one the most medals in swimming thanks to Michael Phelps
It depends on the statistics you are looking for. Rankings of competitve swimmers competing at high levels can often be found on the national swimming body's website. (eg the amatuer swimming association in Britain, or or the American swimming association) If you are looking for results from a particular meet, they are often publicized on the host team or country's website, or can often be found in google.
The state with the most swimming pools would be Arizona.
Australia. Through the 2008 Games in Beijing, Australia has won 56 swimming gold medals and Netherlands has won 18.
Swimming is a more well-rounded work out. Swimmers get into better all around shape, while runners exercise mostly their legs. Both will reduce your percent body fat, and increase your lung capacity (mostly swimming though) and your endurance (depending on if it's cross country or not.) I would pick swimming, though, it's more fun. :)