Viewsheds from Key Observation Points for Knife River Indian Villages National Historic Site (KNRI)
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Visibility viewsheds incorporate influences of distance from observer, object size and limits of human visual acuity to define the degree of visibility as a...
可视域（Visibility viewsheds）综合考量了观测者距离、物体尺寸以及人类视觉敏锐度的限制等影响因素，以此将可视程度定义为一项……
