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The widespread availability of 3D city models enables us to answer a wide range of spatial visibility queries in the presence of obstacles (e.g., buildings). Example queries include " what is the best position for placing a billboard in a city? " or " which hotel gives the best view of the city skyline? ". These queries require computing and differentiating(More)
The widespread availability of indoor and outdoor 3D models enables us to answer a wide range of spatial visibility queries in the presence of obstacles (e.g., buildings, furniture). Example queries include <i>"what is the best position for placing a surveillance camera in an indoor space?" "what is the best position for placing a notice board in a doctor's(More)
In this paper, we present an algorithm for visible edge determination from moving viewpoint in 2D-space by an easier approach. We show implementation details and performance analysis of the algorithm to justify the efficiency and correctness of the proposed algorithm. The time complexity of the algorithm is O(n<sup>2</sup>) in the worst case but we hope(More)
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