湖北省宜昌市森林防火瞭望塔通视性评价研究

通视性评价是G IS可视化的重要内容,在森林防火、建筑规划、景观分析等领域具有重要作用和广泛的应用前景。以宜昌市14个代表性的森林防火瞭望塔为研究对象,进行通视性分析,结果表明:①通视性受瞭望塔的高度、可视距离等因素限制,也与地形有很大关系;精度取决于空间数据和配套属性数据的准确性,与DEM建模中使用的插值方法有关。②宜昌市森林防火瞭望塔可视距离按10km计算,14个瞭望塔可视区域面积占市总面积的12.1%;防火瞭望塔可视距离按理想可视距离(无阻挡无限可视),则14个瞭望塔可视区域面积占市总面积的68.32%。③通视性分析可为宜昌市后期瞭望塔布点提供参考,并在图上实现先期可视化。

Research on Evaluation of Forest Fire Lookout Tower Visibility in Yichang, Hubei

visibility evaluation,as one of the important components of GIS visibility,is applied to forest fire,constructional layout,landscape study etc.In the paper,14 typical forest fire lookout towers were researched by virtue of the visibility analysis.The results showed:(1) visibility analysis was limited by the tower height,visible distance and terrain.Its precision depends on the accuracy of spatial and attributes data and was related with interpolated methods;(2) According to the visible distance of lookout towers(10Km),visible area was 12.1% in the whole city.If the visible distance of lookout towers was perfect,visible area was 68.32% in the city.(3) Visibility analysis provided references of the lookout tower layout and could realized the advanced visibility.