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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。
The visual evaluation is an important part of GIS visualization. It plays an important role in the field of forest fire prevention, architectural planning and landscape analysis, and has extensive application prospects. Taking the 14 representative forest fire prevention watch towers in Yichang as the research object, the author conducts a visual analysis. The results show that: ① The visibility is greatly influenced by the height of the watch tower, the visual distance and other factors; The accuracy depends on the accuracy of spatial data and supporting attribute data, which is related to the interpolation method used in DEM modeling. (2) The visual distance of forest fire prevention watch tower in Yichang City is calculated according to 10km, the area of visual observation area of 14 watchtower accounts for 12.1% of the total area of the city; the visual distance of fire watchtower is the ideal visual distance (unlimited without obstruction) 14 watchtower visual area accounted for 68.32% of the total area of the city. (3) The visual analysis can provide references for the post-observation tower in Yichang City and realize the pre-visualization on the map.