Introduced to viewers in 1998 during an ESPN Sunday Night Football broadcast, Sportvision’s 1st and 10 line has forever altered football-viewing culture: Like magic, that bright “Yellow Line” is always there on the field, showing us exactly how much yardage is needed to keep our team’s drive alive.

The virtual first-down line may look simple, but it’s anything but. A complex network of cutting-edge technology works in concert to virtually “paint” the line across the field, reacting in real time to events in the game.

It all starts with a laser placed in the middle of the field that collects data about elevation points, which is then used to create a virtual 3D map of the contours of the field. This map, or grid, is then overlaid on the camera’s view of the physical playing field. Up to five broadcast cameras, outfitted with custom Sportvision sensors and encoders, feed camera data to the 1st and 10 computers. One broadcast camera is then augmented, live, with the yellow line (any other cameras can be made to show the line for replays).

“A custom-made sensor on the camera that we modify ourselves to track pan, tilt, and zoom tells us exactly what pixel to draw on to make it look like the [yellow] line is on turf,” says Mike Jakobs, Sportvision’s Chief Operating Officer.

A sophisticated, software-driven color-keying process tells the computers what surfaces to draw the yellow line on (grass, dirt, snow, etc.) and what not to draw it on (skin, uniforms, etc.). Add the precise location of the first-down marker after each play and the yellow line appears on your TV screen as if painted on the field itself—right under the players’ feet!

You can now see the same technology behind the Yellow Line being applied to just about all of your favorite sports on TV, including basketball, baseball, bowling, golf, auto racing, and—most recently—horse racing.

Sportvision expects to use the technology to roll out data-modeling services to mobile phones, and the company is in discussions with gaming companies about ways to use the technology in gaming consoles.

And Sportvision is far from done with looking at new ways to further enhance your pigskin pleasures, too. “Our long-term goal is to allow you to manipulate views yourself via your DVR or another consumer tool online, create your own video clip, and share it with your friends,” says Jakobs.