There is no tool that will tell you the resolution of Google Earth's imagery in any specific location. Finally, there are just a few tiny spots around the world where Google Earth shows data collected by citizen scientists (through the Public Lab), using cameras on kites and balloons, which can get down into the few centimeters per pixel range. In much of North America, Europe, Japan and some other places, you'll find even higher resolution images which generally come from aerial systems (cameras on airplanes), and a lot of that data in Google Earth is at about 0.15m resolution. That's about the limit for satellite data, though a few places are staring to get data from newer satellites (including WorldView-3) at around 0.3m. Then you get down to the really high-resolution satellites, including Digital Globe's WorldView-1/2/3 series, GeoEye-1, and Airbus' Pleiades, all of which provide data at around 0.5m resolution. Next you can still find some Ikonos data in a few places, at about 1m resolution. There are many rural areas especially in Africa, where broad coverage is provided by the SPOT satellites, which produce anywhere from 10m to 1.5m resolution. Zooming in, you'll start to get high-resolution in most places. When you zoom out, you will see the nice, pretty global coverage produced from a mosaic of many Landsat scenes, which have a native resolution of ~30m (~15m pan-sharpened). The resolution of imagery in Google Earth varies depending on the source of the data.
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