where does google maps get its traffic data from
Google Traffic Google Traffic works by analyzing the GPS-determined locations transmitted to Google by a large number of mobile phone users. By calculating the speed of users along a length of road, Google is able to generate a live traffic map.[2] Google processes the incoming raw data about mobile phone device locations, and then excludes anomalies such as a postal vehicle that makes frequent stops. When a threshold of users in a particular area is noted, the overlay along roads and highways on the Google map changes color.[3]
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Google Maps Google Maps' satellite view is a "top-down" or "birds eye" view; most of the high-resolution imagery of cities is aerial photography taken from aircraft flying at 800 to 1,500 feet (240 to 460Â m), while most other imagery is from satellites.[4] Much of the available satellite imagery is no more than three years old and is updated on a regular basis.[5] Google Maps uses a variant of the Mercator projection, and therefore cannot accurately show areas around the poles.[6]
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