高亚洲冰、雪和环境专题 最新来稿(未评审) 版本 ZH1
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2000~2018年青海湖湖冰物候特征数据集
A dataset of lake ice phenology of Qinghai Lake from 2000 to 2018
: 2018 - 06 - 29
: 2018 - 07 - 02
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摘要&关键词
摘要:湖冰物候是气候变化的灵敏指示器。青海湖是我国境内最大的咸水湖,其湖冰物候特征及变化备受关注。本文基于较高时空分辨率的Terra MODIS和Landsat TM/ETM+/OLI遥感影像,综合应用RS和GIS技术构建2000~2018年青海湖湖冰物候特征数据集。本数据集基于MODIS数据选用阈值法区分湖冰和湖水,通过设定红光波段、红光和近红外两波段反射率之差的阈值提取湖冰面积,并将基于Landsat TM/ETM+遥感影像人工目视解译的湖冰面积作为真值来验证基于MODIS数据提取的湖冰面积,两者误差仅为0.8%,表明基于MODIS数据提取的湖冰面积具有较好的精度。本数据集包含2000~2018年青海湖湖冰范围矢量数据、湖冰面积比例和湖冰物候特征信息(如开始冻结、完全冻结、开始消融、完全消融、封冻期等)及近19年的青海湖水域矢量信息,可为理解青海湖湖冰时空变化规律及对气候变化的响应提供数据支撑。
关键词:青海湖;MODIS;湖冰物候;阈值法
Abstract & Keywords
Abstract: Lake ice phenology is considered a sensitive indicator of regional climate change. Qinghai Lake is the largest saltwater lake in China and its characteristics and changes of lake ice phenology have been paid more attentions. Based on multi-source remote sensing (RS) datasets including the MOD09GQ surface reflectance product and Landsat TM/ETM+/OLI images, a dataset of ice phenology of Qinghai Lake from 2000 to 2018 was built by using RS and GIS technology. Due to the spectra differences between lake ice and lake water, the method of threshold segmentation which combined reflectance of the red band with the reflectance difference between the red and near-infrared bands was adopted to extract the ice area of Qinghai Lake based on MOD09GQ product. Meanwhile, the artificial visual interpretation results of lake ice based on Landsat TM/ETM+/OLI images was used to verify the corresponding lake ice area based on MOD09GQ product, which showed the relative error was only 0.8%. This dataset includes the vector boundary, the area ratio, phenology information of lake ice and water area of Qinghai Lake from 2000 to 2018. Specifically, the lake ice phenology information of Qinghai Lake involves the dates of the lake freeze-up start, freeze-up end, break-up start, break-up end and completely freezing duration, etc. This dataset can provide an important reference for exploring the spatio-temporal characteristics of lake ice of Qinghai Lake and the response of lake ice to climate change.
Keywords: Qinghai Lake; MODIS; Lake ice phenology; Threshold method
稿件与作者信息
祁苗苗
Qi Miaomiao
姚晓军
Yao Xiaojun
xj_yao@nwnu.edu.cn
李晓锋
Li Xiaofeng
高永鹏
Gao Yongpeng
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