Updating google earth maps
If you go to the bottom of the satellite map, you see a date stamp marking the last update.
You receive an email notification confirming that you've set up the alert, with a warning that updates can take "weeks, months and even years." Next time Google Maps updates this location, it will email you.
There are times when Google Maps updates in real-time to mark major events and to give assistance in emergency situations.
For example, it updated imagery for the 2012 London Olympic Games just before the Opening Ceremony, and it provided updated satellite crisis maps to help aid teams assess damage and target locations in need of help shortly after the Nepal earthquake in April 2015.
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.
There is no set update schedule for either mapping program.
All the imagery can be accessed using the Earth Engine application programming interface, which scientists use to study large-scale global changes in the environment and track the spread of diseases.With Google's Follow Your World tool, you can also sign up for email notifications when specific location images change.The satellite data on Google Maps is typically between 1 to 3 years old.At the time, Google used shots captured by the less-capable Landsat 7, which suffered a hardware failure back in 2003 that resulted in some portions of the world having diagonal gaps of missing data.Below, you can see the how Landsat 8's imagery of New York City is vast improvement over what Google was using before: Google says its new mosaic was crafted from nearly a petabyte of data containing more than 700 trillion pixels.
The images on Google Earth are always updated as they try to provide users with the highest-resolution images possible of the different locations available.