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It used to be that looking something up on a map

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meant unfolding a huge piece of paper

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you kept in your glove box

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and driving past the turnoff to Des Moines

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in the time it took to find section A53.

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Fast forward a few years, and now thanks to Google Maps,

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you can zoom in so far on nearly any street in the world

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that whether you want a bodega in the Big Apple

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or just a regular apple in Manhattan, Kansas,

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you're not bound to have a problem.

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But this unprecedented level of detail

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didn't happen overnight.

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Google managed to get a foothold

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in the online mapping scene back in the mid-2000s

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when it acquired WhereTo Technologies,

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who had the idea to let people scroll around on a map

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without having to refresh,

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a novel concept that helped set Google Maps apart early on.

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But they needed more than just a pretty interface.

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Fortunately, Google is first and foremost a data company,

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so they often start by working directly

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with national and local government offices

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to determine not only exactly where every road is,

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but how lanes are spaced and allocated on freeways

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to give an accurate base experience.

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Unfortunately, oftentimes the government won't

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or isn't able to provide a completely accurate picture

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of how an area is laid out.

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Oh, you.

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So this is where Google Street View comes in.

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You can learn more about that up here,

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but hold on, isn't Street View just a way

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for users to virtually sightsee?

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The answer, as it turns out, is no.

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Google also uses Street View internally

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in order to double check and tweak

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its existing mapping data.

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As the Street View car takes photos of its surroundings,

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special AI can recognize any signs caught by the camera

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and send them to be analyzed by Google's servers

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to determine not only lane placement

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and traffic restrictions,

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but among other things,

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even the proper addresses of local businesses.

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All of this information is then also used

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to prevent Maps from giving you bad directions by,

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for example, sending you the wrong way

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down a one-way street.

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That would be bad.

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Adding another layer to Maps is Google's access

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to a huge amount of satellite data,

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partly from its acquisition

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of satellite imaging service Keyhole in 2004,

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and partly from government sources.

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They use top-down views of street markers

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to further improve accuracy,

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and they've even got to the point

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where they can use satellite imagery

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to extrapolate the shapes and footprints of buildings,

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not only to give you 3D views in Google Earth,

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which are super cool,

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but also to enable you to see outlines of these buildings

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in the regular Maps view.

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So by intelligently combining data

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from all of these sources,

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Maps can construct quite an accurate picture

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of any given patch of land pretty well,

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but even Google can't completely automate things, yet.

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They also use human employees

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in a project called Atlas to make necessary adjustments.

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One of this team's common tasks

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is to investigate user error reports

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and tweak routes on the map layer

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that clearly don't match up

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with a recent satellite image or street view capture.

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And this kind of user reporting

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reflects how crowdsourcing is another major piston

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in Google Maps' engine.

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And I'm not just talking about the photos you see

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on business listings, either.

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Google relies partially on volunteers

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to map areas it may have limited data on,

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something that's especially important

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in less developed countries,

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where it's harder for Google to send vehicles

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or get accurate mapping data from a government.

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Of course, Google uses other tricks, too,

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to flesh out the experience.

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Once upon a time, they licensed databases

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to dramatically expand how many businesses Maps would show,

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but these days, listings are pulled

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from other public sources and from business owners

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who are eager to take advantage

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of the visibility that Google Maps provides.

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Owners of large facilities have even submitted floor plans

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and granted Google permission to do site surveys

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to help you find your way around.

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This is particularly useful for sports arenas,

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shopping malls, and airports,

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and Google even works with a third-party service

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that keeps track of gas prices

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by looking at credit card data

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and even getting direct data feeds

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from major gas station chains.

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Finally, whether you realize you've signed up for it or not,

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Google also uses you.

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Location services and the GPS on your phone

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helps Google understand, on top of where it is,

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how to get there,

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and how many square feet of patio space is available,

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what times of day your favorite watering hole gets crowded.

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And they don't show you,

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but they probably know the demographic makeup

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of the clientele, too.

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Wow.

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So the real answer to how does Google Maps work

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is that Google simply has so many information gaps,

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and gathering tentacles,

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that if they were the star of a Japanese anime,

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I probably wouldn't watch it at work.

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Are you interested in computer science?

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Then check out Brilliant,

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a problem-solving website

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Instead of passively listening to lectures,

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So what are you waiting for?

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That's it for this video, guys.

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