It was an aerial view of the city. It was an aerial map of the city. It was an aerial painting of the city.
Any other ways to say this?
Here are some synonyms you might find useful:
It is an aerial perspective of the city
It is a satellite view of the city (photograph, not map)
It is a bird's eye view of the city
It is an aerial view of the city
It is an ordinance survey of the city (British english, map - not photograph)
It is an overview of the city (somewhat archaic)
If it is a painting, one might likely say 'a painting of an aerial view' of the city, 'a painted map' of the city, or perhaps 'a hand-painted map' of the city.
'Maps' are typically created in this perspective, so it would likely go unmentioned as in: 'a map' of the city. Exceptions might call attention to their deviation from the norm: 'a 3D-perspective map' of the city.
An aerial painting of the city could be ambiguous as one might believe that the painting was painted while the artist was airborne.
'Satellite view' or 'satellite photograph' would be correct only for very-high altitude photography (as might be taken from a satellite.) 'Aerial photograph' would be a better term to use if the photo were taken from a plane, a hot-air balloon or some other airborne yet non-satellite platform.
I hope this helps!