基于阈值比值法的森林冰雪冻害遥感评估——以湖南省为例
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王学成, 杨飞, 高星, 张英慧
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Assessment of forest damage due to ice-snow disaster based on the method of threshold ratio:A case study of Hunan Province
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Xuecheng WANG, Fei YANG, Xing GAO, Yinghui ZHANG
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表5 不同海拔森林受损面积
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Tab.5 Damaged area of forest at different altitudes
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海拔 |
类别 | 图像阈值法 | 阈值比值法 | | | 重度受灾 | 中度受灾 | 轻度受灾 | 重度受灾 | 中度受灾 | 轻度受灾 |
400 m以下 | 面积/104hm2 | 107.81 | 46.69 | 29.59 | 89.30 | 55.49 | 39.30 | | 占比/% | 58.56 | 25.37 | 16.07 | 48.51 | 30.14 | 21.35 |
400~800 m | 面积/104hm2 | 83.82 | 43.37 | 37.51 | 94.47 | 41.92 | 28.32 | | 占比/% | 50.89 | 26.33 | 22.77 | 57.36 | 25.45 | 17.19 |
800 m以上 | 面积/104hm2 | 27.91 | 18.01 | 21.26 | 39.58 | 16.98 | 10.62 | | 占比/% | 41.55 | 26.80 | 31.65 | 58.91 | 25.28 | 15.81 |
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