基于AVHRR影像的北半球积雪识别算法
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王京达, 郝晓华, 和栋材, 王建, 李弘毅, 赵琴
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Snow discrimination algorithm in the Northern Hemisphere based on AVHRR image
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Jingda WANG, Xiaohua HAO, Dongcai HE, Jian WANG, Hongyi LI, Qin ZHAO
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表3 云检测及其阈值
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Table 3 Cloud detection tests and their threshold values
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| 土地类型 | 序号 | 是/否 | 高程/m | Ref1 | Ref2 | Ref3 | Ref1-Ref2 | NDVI | BT11/K | （BT37-BT11）/K | （BT11-BT12）/K |
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| 高寒地（高程>300 m，BT11<260 K） | A1 | 是 | <3 000 | | | | | | ≥240 | >14.5 | | | A2 | 是 | ≥3 000 | | | | | | ≥240 | >15.5 | | | A3 | 是 | | | | | | | <240 | >21.0 | | | A4 | 是 | | | | >0.1 | >0.02 | | | >25.5 | | | 其他土地 | B1 | 是 | | | | | | | <260 | >14.0 | | | B2 | 是 | | | | | >-0.02 | | <310 | >10.5 | | | B3 | 是 | | >0.3 | | | >-0.02 | | <293 | >11.5 | | | B4 | 是 | | | >0.4 | | >-0.03 | | <293 | >11.5 | >-1 | | B5 | 是 | | | >0.4 | | | | <278 | >11.5 | >-1 | | B6 | 是 | | >0.3 | | >0.02 | | | | >11.5 | | | B7 | 否 | | | | | | >0.5 | >288 | | | | B8 | 否 | | | | | | | >310 | | | | B9 | 否 | >1 000 | <0.4 | | | <-0.04 | | >275 | | | | B10 | 否 | | | | | <-0.04 | | >300 | | |
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