Spatio-temporal patterns of cloud interference in Dongjiang River basin from MODIS data
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摘要: 为在更高精度水平上分析植被指数时空变化特征,增强去云降噪环节的针对性和科学性,以东江流域2001—2015年间MOD13Q1产品中的云标记信息为数据源,利用地理信息系统空间分析方法,分别从云干扰概率及其空间分布、云干扰像元消除率及其空间分布和云干扰持续时长季节差异3个方面分析了东江流域云干扰时空特征.结果表明,该流域整体云干扰概率随合成时段加长而迅速降低;新增云干扰像元消除率随合成时段加长而先增加后减少;空间上南部城市化区域的云干扰持续时段相对更长,时间上夏季和春季的云干扰持续时段相对更长.该研究结果可为优选或开发更具时空适应性的植被指数时间序列数据去云降噪方法提供科学依据.Abstract: In this paper,the authors aim to clarify the spatio-temporal patterns of cloud interference in Dongjiang River basin and then provide scientific basis for vegetation index studies at the level of higher precision in this area. Cloud flag information of MOD13Q1 product data sets within the range of Dongjiang River basin from 2001 to 2015 were analyzed using the GIS approach. Three aspects were analyzed,i.e.,the probability of cloud interference and its spatial distribution, the elimination rate of cloud interference and its spatial distribution and the seasonal differences of cloud interference duration period length. The results show that the whole probability of cloud interference was reduced rapidly with the increase of compounding period length,the new added elimination rate of cloud interference firstly increased and then decreased with the increase of compounding period length. The duration period length of cloud interference was relatively longer in southern urbanized region,and in summer and spring. The results of this study can provide scientific basis for choosing or developing better methods of removing clouds for vegetation index time-series data.
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Key words:
- Dongjiang River basin /
- MODIS /
- cloud flag /
- cloud interference
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