Feedback Needed: Wireless Camera Traps

I am interested in making long distance wireless camera traps ( approx 15 kms), but as a proof of concept i am trying to make a short distance one (approx 500 metre) first, possibly using a zigbee controller. In the system, my vision is to make a camera trap(s) that  can send the images taken by it  to a master system (like a PC) over short distances, using zigbee. I'd like to know your thoughts on the feasibility and problems related to such a system?

Thanks in Advance

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