You'll have to look at the Megapixels available for the camera, and its field of view at whatever distance interests you.
Then see what the resolution might be in pixels per foot or inch.
This is a 3.2 megapixel image.. 2272x1704 of a fire just about 2-1/2 miles from the camera as an example.
The blow-up shows cars on the highway at about 2 miles