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Mobility models play an important role in the evaluation of wireless ad hoc networks. However, most existing mobility models are limited to 1D or 2D user movement. In this paper, the authors propose a novel 2.5D mobility model suitable for modeling the movement of backcountry skiers in mountainous terrains. These skiers carry wireless devices for communication in the event of emergencies, such as an avalanche, and thus form a dynamic mobile wireless ad hoc network. Their model represents groups of skiers, with each group having an invisible leader who determines the general direction of movement. They calculate the acceleration, velocity, and position of the group leader based on properties of the terrain, gravitational force, and a randomized sine function.
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