What is the current Google Earth Pro altimetry data source? SRTM or other? When is the resolution of the data? If there are different sources, where to obtain this information?
Google earth uses several Digital Elevation Models (DEMs) some of them use the SRTM at 1-arc spatial resolution (~30 m) [https://explorer.earthengine.google.com/#detail/USGS%2FSRTMGL1_003]