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- Title
The NIEER AVHRR snow cover extent product over China - A long-term daily snow record for regional climate research.
- Authors
Xiaohua Hao; Guanghui Huang; Tao Che; Wenzheng Ji; Xingliang Sun; Qin Zhao; Hongyu Zhao; Jian Wang; Hong yi Li; Qian Yang
- Abstract
Using the Google Earth Engine (GEE) platform, a long-term AVHRR snow cover extent (SCE) product from 1981 until 2019 over China has been generated by the snow research team in the Northwest Institute of Eco-Environment and Resources (NIEER), Chinese Academy of Sciences. The new NIEER product has the spatial resolution of 5-km and the daily temporal resolution, and is a completely gap-free product, which is produced through a series of processes such as the quality control, cloud detection, snow discrimination and gap-filling. A comprehensive validation with reference to ground snow-depth measurements during snow seasons in China revealed the overall accuracy is 87.4%, the producer's accuracy was 81.0% the user's accuracy was 81.3%, and the Cohen's kappa value was 0.717. Another validation with reference to higher-resolution snow maps derived from Landsat-5 Thematic Mapper (TM) images demonstrates an overall accuracy of 89.4%, a producer's accuracy of 90.2%, a user's accuracy of 96.1%, and a Cohen's kappa value of 0.713. These accuracies were significantly higher than those of currently existing AVHRR products. For example, compared with the well-known JASMES AVHRR product, the overall accuracy increased approximately 15 percent, the omission error dropped from nearly 40% to 19.7%, the commission error dropped from 31.9% to 21.3%, and the CK value increased by more than 114%. The new AVHRR product is now already available at https://dx.doi.org/10.11888/Snow.tpdc.271381 (Hao et al. 2021).
- Subjects
CHINA; CLIMATE research; CHINESE Academy of Sciences (Beijing, China); SNOW cover; QUALITY control; RESEARCH teams; NEW product development
- Publication
Earth System Science Data Discussions, 2021, p1
- ISSN
1866-3591
- Publication type
Article
- DOI
10.5194/essd-2021-189