Google Earth updates its database completely every one to three years, though some sections update more frequently. Google Maps updates daily, with changes appearing on the app and website within approximately three weeks of the update being made. read more
Google Maps Update Schedules. The satellite data on Google Maps is typically between 1 to 3 years old. According to the Google Earth Blog, data updates usually happen about once a month, but they may not show real-time images. Google Earth gathers data from various satellite and aerial photography sources, and it can take months to process, compare and set up the data before it appears on a map. read more
We are often asked how often Google updates the imagery in Google Earth. The answer depends on where you live and can be anywhere from once a week to never. For much of the world, there are certain hotspots that get fairly regular updates and other places that have no high resolution imagery whatsoever. read more
Overall, Google Earth is updated every time a new release comes out. Whatever new images that have been taken are included in the new release of the software. As a whole, though, it takes between one and three years for the entire Earth to have been redone because Google relies on third party companies to take the very close, in depth aerial photographs. read more