Balloons are also an option, one with the potential of going right to the edge of space.
Staying with models, or perhaps I should call them unmanned aerial vehicles (UAVs), the size and complexity can range from the banal to the sublime. From a simple model aircraft with a cheap camera, flown by a hobbiest like myself and costing not much over £100 to seriously large minature helicoptors (~ 8ft rotor diameter) powered by large IC engines, equiped with gyroscopically stabilised camera platforms and requiring two-man crews, one to fly it and the other to operate the camera. Such equipment is a major investment only companies are likely to make.
UAVs like these are used by aerial survey companies because they are cheap compared to the cost of operating full-size helicoptors (note I did not say real ones, the UAV described above is as real as they come). There are other advantages too - less noise, less regulation and the ability to operate out of tiny spaces such as the customer's back garden. They are suitable for all sorts of aerial survey work and are used by the police, fire service and numerous private companies.
And now, back to modellers' models for aerial photography. Onwards and upwards...