'Vette was a racing game from the 90's (I think?) that covered San Francisco. "Released on 3 floppy disks", ha ha. Obviously without the rich dataset we have now. (Clicking on the following link ignores the trailing exclamation point in MacOS Safari for me.) https://en.wikipedia.org/wiki/Vette!

I did a voxel (ray casting) lunar lander that used actual NASA moon data (https://mooncraft2000.com).

Screenshots of Vette! at MobyGames:

https://www.mobygames.com/game/799/vette/screenshots/dos/

Man, I just posted this same comment. 'Vette was the first thing I thought of. Ever since playing it way back then, I wanted a better SF open world game.