Google Earth Pro 5.2, that features Multitrack and Elevation Profile, Google Earth Pro Data Layers, and the new "Vector and Image Regionation" that make it possible to integrate even more of your own data and imagery into the Google Earth globe, while maintaining the fast, 3D performance you and other professionals rely on.
"In a nutshell, Regionation allows Google Earth Pro to display huge amounts of data. It does so by breaking the data or imagery into the smallest necessary components. This means that only the data that is in view needs to be retrieved. You can think of Regionation as a hierarchical subdivision of points or tiles, which shows less detail from afar, and more detail as you zoom in to the globe. This dynamic loading creates clearer visualizations by minimizing clutter, while simultaneously speeding up the rendering process," explains Google.