The real question is, is this more useful than the photographic approach? i.e. does a user identify these landmarks better in this slightly abstracted hand drawn rendering than in a photo rendering of the same?
There's less cognitive overhead in processing these renderings because there's less stuff to pay attention to. A photograph tends to record everything, which can be overwhelming if you're looking for select landmarks.
Also, the real world tends to be more drab and polluted than these cheery 100% saturation renderings.
Also, the real world tends to be more drab and polluted than these cheery 100% saturation renderings.