Viewsheds from Key Observation Points for Lyndon B. Johnson National Historical Park (LYJO)
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https://catalog.data.gov/dataset/viewsheds-from-key-observation-points-for-lyndon-b-johnson-national-historical-park-lyjo
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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）会纳入观测者距离、物体尺寸以及人类视觉敏锐度限制等因素的影响，以此将可视程度定义为……
