Not sure about zoom levels by administrative buildings, I more about technologies, so low zoom can be reached with high enough viewpoint, like hill or tall tower.
Universities may give that prospecting map of local resources. So its really administrative view by cumulative knowledge of non-character surveyors.
Also universities may give worldmap after you got travel around the world far enough.
Middle zoom after you got flying transport (maybe shortcut with flying mounts...). Surelly need sorta ballons and zepellins...
Max zoom must be need an orbital station\satellite.
May design special low efficient rocket with weakest possible engine power just to escape the planet gravity... And use it as disposable ship, like normal early rockets.
Universities may give that prospecting map of local resources. So its really administrative view by cumulative knowledge of non-character surveyors.
Also universities may give worldmap after you got travel around the world far enough.
Middle zoom after you got flying transport (maybe shortcut with flying mounts...). Surelly need sorta ballons and zepellins...
Max zoom must be need an orbital station\satellite.
May design special low efficient rocket with weakest possible engine power just to escape the planet gravity... And use it as disposable ship, like normal early rockets.