Placeholder Image

字幕列表 影片播放

  • Hey over there, I can see you! Where you ask? EVERYWHERE! I just pull it up from a satellite.

  • Hey gang, Trace here for DNews! There was a time when satellite imagery was conspiracy

  • talk, only available to high-level government officials, or, like, spies. But thanks to

  • Google Maps and Apple Maps, and Bing Maps, and Mapquest and the dozens of others out

  • there we can see satellite images every day! For FREE!

  • Though we just use them to find the nearest thai restaurantthe process of getting

  • them into your phone is INVOLVED, man. The first reconnaissance, or spy satellites were

  • the Corona satellites launched in the 1960s. They had film cameras on board, and to get

  • that film back to earth, they ejected it with a parachute and had to go pick it up! The

  • Air Force would try and snag it out of the air, or the Navy would sail over once it hit

  • the ocean.

  • These early experiments taught us how to take pictures from a moving satellite of a moving

  • planet while 100 miles up. For example, the lenses on the Corona satellites rotated constantly

  • to keep the shot steady. They even tried angling two cameras to capture a stereo image! Spy

  • satellites were so good at grabbing images without letting the spyees know what was up,

  • the United States and other nations continue to use them!

  • But when Google acquired satellite imaging company Keyhole in 2004, they changed the

  • whole game. Now anyone could look down on the planet and make comments. They still blur

  • sensitive areas, as required by world governments, but mostly the images we're seeing are WAY

  • better than the ones we used in the 60s to determine how to avoid World War Three.

  • Today, the actual satellite images are taken by companies like TeleAtlas, DigitalGlobe,

  • EarthSat, Skybox, and others. They're then sold or licensed to governments and companies

  • for geology, mapping, urban planning, shipment trackingthe applications are endless.

  • This is why some of the images on satellite maps are lower resolution than others. Each

  • company is working with different equipment and regulations keep the companies from scanning

  • faces, backyards or license plates.

  • A few months ago, regulators loosened restrictions on U.S.-based DigitalGlobe. So last week,

  • they launched the WorldView-3 satellite, their highest resolution sat ever. Which means,

  • in a few weeks, maps could see images with a resolution as high as 25 centimeters! Basically,

  • they'll be able to see a piece of paper, but not read it. They WANT to launch sats with

  • 10 cm resolution, about the size of your phone screen. Google says the data on their maps

  • are updated as often as possible, so though they're not LIVE, some images are as new as

  • two weeks old, and none are older than three years. Which means this new, high-res 25 centimeter

  • imagery might be appearing soon. Each mapping company is in charge of stitching the images

  • into one, giant map, adding the locations of interest and keeping it regular.

  • But speaking of real time data; that stuff is notoriously locked up. Remember, the satellites

  • are moving, the planet's movingviewers of live images can only see what the satellite

  • is looking at during any particular moment, and moving a sat to look at your ex's driveway

  • isn't really practical. But a NASA program called EarthKAM is letting students get access

  • to real time space cameras -- not via spy sats, but via a camera right on the international

  • space station!

  • Schools around the world are signing up students by the thousands to explore our planet using

  • live images, because there's just something about seeing this information in real time,

  • amirite? Students of the Sally Ride EarthKAM program can directly control the camera, taking

  • pictures of the Earth and analyzing human geography, geology, ecology, and global change!

  • They even learn about space operations and do flight control simulations! Sign me up!

  • How do you feel about satellites getting more accurate images? Freaked out? Excited?

  • Go on, let loose in the comments and be sure you subscribe for more DNews, seven days a

  • week. And as long as you're in a clicking mood, click here or on the link in the description

  • to RSVP for our next SpaceOut on August 27th at 4pm Pacific! Each month, Ian O'Neill and

  • I get together and hangout with experts from NASA/JPL to talk space. This month, it's about

  • Europa! Planned robotic missions, possibilities of alien life, and cutting through ice millions

  • of miles away! It's going to be awesome. RSVP now, so you don't get lost on the way. Thanks

  • for watching!

Hey over there, I can see you! Where you ask? EVERYWHERE! I just pull it up from a satellite.

字幕與單字

單字即點即查 點擊單字可以查詢單字解釋

B1 中級 美國腔

谷歌地圖如何工作? (How Does Google Maps Work?)

  • 260 19
    Lucy Fan 發佈於 2021 年 01 月 14 日
影片單字