doppler radar

The Score

How It Works: ESPN's Ball Tracker Follows Home Runs With Doppler Radar

Debuted during the Home Run derby, the ball-tracking tech uses advanced data processing to superimpose on your screen where a ball will land immediately after it leaves the bat, just like in the video games


As if a night filled with 480-foot home runs wasn’t exciting enough, ESPN introduced its much-hyped Ball Tracker technology during Monday's Home Run Derby, giving balls a digital comet trail that indicated whether or not it could clear the fences.

While superimposing graphics in post-processing has been around longer than steroids, the system unveiled last night has some truly cool tech powering it, relying on Doppler radar to instantly track and predict the ball's path in real time, just 400 milliseconds after it leaves the bat.

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Your Local Weather Radar on Google Earth


Morale could use a little boost here at PopSci HQ this evening—our long awaited first office softball game has been postponed due to the approach of inclement weather. Alas, our poor opponents will have to wait another week to face our softball wrath. One good thing has come out of Mother Nature's cruel trick, however: the discovery of the National Weather Service's free Doppler Radar service on Google Earth.

If you ask me, Doppler radar is one of the finer developments of our time. From switching over to the local cable channel that used to show all-radar-all-the-time as a kid to witnessing the news channels' eternal Doppler arms race (New! Doppler Super Hawk Vision 3000!), much ballyhoo has always surrounded our ability to visualize the approach of oncoming storm clouds and prepare ourselves accordingly.

I don't know if it will ever get better than this, though: simply head over to the NWS's special site, choose your region and the type of radar you want (Composite Reflectivity! Storm Relative Motion!) and open the resulting file in Google Earth. Awesome. —John Mahoney

Link - NWS Enhanced Radar Images

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The Car of the Future

Steer, Stop: The last bastions of mechanical linkage fall.

When you hit the brakes on the new Mercedes SL500,
the car takes it as a digital recommendation, not a physical order. Mercedes has managed to consolidate most modern brake-control features into a single, integrated unit it dubs the Sensitronic brake system. The heart of the system is an electrically powered, high-pressure hydraulic supply that can apply considerably more force, more quickly, than an old-fashioned foot, even with power assist.

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December 2009: Best of What's New

In our December issue, Popular Science names the 100 best innovations of the year: bombproof wallpaper, self-parking cars, the fastest helicopter, and 97 more. Plus inventor profiles and videos.

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