Start With the Incident You Need to Review
The first question in a commercial camera project should not be “how many cameras?” It should be “what do we need to see later?” A parking lot camera, register camera, lobby camera, dock camera, hallway camera, and license plate view all have different requirements.
A useful camera system is designed backward from the incident review. The camera angle, lighting, resolution, lens choice, storage retention, and network design all affect whether footage is actually useful.