As far as I can tell, there are only two APIs for accessing Google Earth content - the Javascript API and the Windows-based C # API (which seem to just be wrapper classes called the Javascript API.) I donβt know but I I believe the Google Maps API will also be in Javascript.
Given that you are on Linux and using C ++, my suggestion would be to include a browser in your application and create C ++ wrappers to make the Javascript calls you need (e.g. the Windows C # API.)
If you are starting an open source project, other people can help you create C ++ wrappers.
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