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A dataset of lake ice phenology in Qinghai Lake from 2000 to 2018
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: 2018 - 06 - 29
: 2018 - 08 - 02
: 2018 - 08 - 02
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Abstract & Keywords
Abstract: Lake ice phenology is considered a sensitive indicator of regional climate change. Qinghai Lake is the largest saltwater lake in China. Its lake ice phenological characters and changes have attracted much attention. Based on remote sensing datasets including the MOD09GQ surface reflectance product and Landsat TM/ETM+/OLI images, a dataset of lake ice phenology in Qinghai Lake from 2000 to 2018 was built by using RS and GIS technologies. Due to spectral differences between lake ice and lake water, the method of threshold segmentation was adopted to extract the ice area of Qinghai Lake based on MOD09GQ product, which was achieved by setting a reflectance threshold for red band and a reflectance difference threshold between red and near-infrared bands. The extracted ice area was then validated against the visually interpreted ice area based on Landsat TM/ETM+/OLI images, which showed a relative error of 0.8% only. This dataset includes ice-water vector boundary data, area ratio, and phenological characters in Qinghai Lake from 2000 to 2018. Specifically, phenological information records the start and end dates of lake freeze-up and break-up, freeze-up periods, etc. This dataset provides an important reference for exploring the spatio-temporal characteristics of lake ice in Qinghai Lake, as well as for formulating responses of lake ice-based climate changes in the region.
Keywords: Qinghai Lake; MODIS; lake ice phenology; threshold method
Dataset Profile
TitleA dataset of lake ice phenology in Qinghai Lake from 2000 to 2018
Data corresponding authorYao Xiaojun (xj_yao@nwnu.edu.cn)
Data authorsQi Miaomiao, Yao Xiaojun, Li Xiaofeng, Gao Yongpeng
Time range2000~2018
Geographical scope36.53°~37.25° N, 99.60°~100.78° E
Spatial resolution250 m
Data volume42.36 MB
Data format*.shp, *.xlsx
Data service systemhttp://www.sciencedb.cn/dataSet/handle/634
Sources of fundingOpen Foundation of the State Key Laboratory of Cryosphere Sciences, CAS (SKLCS-OP-2016-10); National Natural Science Foundation of China (No. 41561016); Research Capability Promoting Project for Young Scholars of Northwest Normal University (No. NWNU-LKQN-14-4)
Dataset compositionThis dataset includes four parts of data: ice-water vector boundary data, lake-ice area ratio, and lake ice phenological characters in Qinghai Lake from 2000 to 2018, which are stored in the following four files:
1. Lake ice vector boundary data of Qinghai Lake from 2000 to 2018. ZIP, with a data volume of 40.85 MB;
2. Lake ice area ratio of Qinghai Lake from 2000 to 2018. ZIP, with a data volume of 66.79 KB;
3. Lake ice phenological characters in Qinghai Lake from 2000 to 2018. ZIP, with a data volume of 8.75 KB;
4. Water vector boundary data of Qinghai Lake from 2000 to 2018. ZIP, with a data volume of 1.43 MB.
Article and author information
Qi Miaomiao
主要承担工作:数据处理和撰写论文。
Yao Xiaojun
主要承担工作:研究思路设计和过程指导。
xj_yao@nwnu.edu.cn
Li Xiaofeng
主要承担工作:编写批处理代码。
Gao Yongpeng
主要承担工作:数据下载。
Publication records
Released: Aug. 2, 2018 ( VersionsZH2
References
中国科学数据
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