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Google maps covers 98% of the planet

Google maps needs no introduction, we are all used to using it and we are perfectly familiar with its features, but probably we never stopped to think about how Google is able to provide this service and or how much percentage of the planet has been perfectly mapped out.
The application of Big G now covers almost all of the inhabited terrestrial globe, as many as 36 million square miles of high definition satellite images are in fact saved in its databases, without forgetting the street view function: the mode that allows you to see not only the schematic map of the city, but actual live photos of alleys and streets, can count up to 10 million miles of images, a sufficient distance to cover our planet for 400 times. The service is estimated to have a total of one billion monthly users.
But how was this result even possible?
Many think that the satellite network that orbits our planet is enough to take high definition photos of our cities. However, if it is true that much of the work is done by satellites, Google uses some stratagems (tricks) to increase the database of the images.
The Colossus says he uses automobiles equipped with cameras to take photos from as many angles as possible, in the suburban areas. In areas where it is more difficult to get around by car, such as wildlife reserves, we send people instead, equipped with technological backpacks, to take shots and capture every known corner.
Finally, the collected images are all put together to recreate a reality using a technique called photogrammetry, also used to create virtual reality experiences.
The methods that Google uses, the big question in terms of privacy often arises: the techniques with which the above mentioned photos are taken, or experiments of various types such as those related to facial recognition, have caused the company quite a few inspections during the last years, but we must admit that being able to map out an entire planet is a remarkable result.