In this paper, based on the information about navigation system of UAV with PTZ camera and 3D topography, algorithm able to show us in real-time UAV's geographical shooting location and automatically calculate superficial measure of the shooting area is proposed. And the method that can automatically estimate whether UAV is allowed to shoot a specific area is shown. In case of an UAV's shooting attempt at the specific area, obtainability of valid image depends on not only UAV's location but also information of 3D topography.As a result of the study, Ground Control Center will have real-time information about whether UAV can shoot the needed topography. Therefore, accurate remote flight control will be possible in real-time. Furthermore, the algorithm and the method of estimating shooting probability can be applied to pre-flight simulation and set of flight route ※ 본 연구 중 UAV 관련 분야는 중소기업청 기업부설연구소 업그레이드 지원사업의 지원으로 수행중입니다. ※ 본 연구 중 지능형 영상감시 시스템 분야는 연구개발특구진흥재단 연구개발특구육성사업의 지원으로 수행된 결과의 일부입니다.First Author:한국산업기술대학교 대학원 전자공학과 ,