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面向多背景环境的Sentinel-2云检测
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作者 伍炜超 叶发旺 《自然资源遥感》 CSCD 北大核心 2023年第3期124-133,共10页
在对遥感影像进行处理分析的过程中,云层覆盖往往会对遥感信息的提取造成阻碍。然而,地表背景环境复杂多变,由于不能有效提取云目标和背景环境间的特征差异,现有方法虽然在大多数背景环境下具有较好的云检测效果,但在某些环境下则存在... 在对遥感影像进行处理分析的过程中,云层覆盖往往会对遥感信息的提取造成阻碍。然而,地表背景环境复杂多变,由于不能有效提取云目标和背景环境间的特征差异,现有方法虽然在大多数背景环境下具有较好的云检测效果,但在某些环境下则存在明显的误分漏分,不能保持原有的检测效果,表现出稳定性差、泛化能力不足的特点。对此,该文提出了一种适用于多背景环境的云检测方法,首先基于Sentinel-2A数据,对云目标与背景环境的光谱特征差异进行分析以辅助检测样本选择,并在此基础上加入薄云最优变换(Haze optimized transformation,HOT)和云位移指数(cloud displacement index,CDI)等更有效的检测指标;最后训练得到基于随机森林的云检测模型,从背景环境和云目标种类对检测精度的影响出发,在不同背景环境的影像上与Fmask算法进行对比。结果表明,相对Fmask算法,该文方法的总体精度和F1分数分别提高了2.2%和2.9%,总体精度和F1分数的标准差分别降低了29.6%和72.5%,说明该方法在保持高检测精度的同时,显著提升了不同环境下云检测的稳定性,能够有效应用于多背景环境下的云检测。 展开更多
关键词 Sentinel-2 云检测 随机森林 Fmask HOT CDI 多背景环境
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Construction and Optimization on Environmental Protection under the Background of Species Diversity and Green Ecology
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作者 Deng Yazhong 《International Journal of Technology Management》 2016年第10期31-33,共3页
In this paper, we conduct research on the construction and optimization on environmental protection under the background of species diversity and green ecology. In scope, the environmental policies include pollution c... In this paper, we conduct research on the construction and optimization on environmental protection under the background of species diversity and green ecology. In scope, the environmental policies include pollution control policies, ecological conservation policies and basic international environmental policies which should be considered based on the following aspects. (1) The urban environment issue possibly emerges in the urban inside and outside interactions, thus the government to the ecological environment must pay attention to the sector coordination, and even must global footprint from the national and criterion consideration. (2) Environmental protection is not only adapted to the needs of the environment through the transformation, but stressed that ecological construction, that is, to promote the coordination between mankind and the natural environment. Development and protection are regional which should be global and intertwined. 展开更多
关键词 Construction and Optimization Environmental Protection Species Diversity
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