Google sources HD satellite images from various providers. So far, around 36 million square miles of satellite imagery has been added to Google Earth. Now, here’s the interesting part: these images cover the areas where almost 98% of the earth’s total population lives.
Then there is Street View that gives us an idea of how different places look like in real life. To capture these, Google uses special camera rigs called Trekkers that are fitted on cars, humans, boats, and even camels and flocks of sheep. All of this is to add Street View images of areas where cars can’t go.
After creating a mountainous pile of digital photos, Google uses a technique called photogrammetry to stitch the images together to create a seamless experience for the users.