气候变化领域集成服务门户(CCPortal): Assessment of machine learning classifiers for global lake ice cover mapping from MODIS TOA reflectance data

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DOI	10.1016/j.rse.2020.112206
	Assessment of machine learning classifiers for global lake ice cover mapping from MODIS TOA reflectance data
	Wu Y.; Duguay C.R.; Xu L.
发表日期	2021
ISSN	00344257
卷号	253
英文摘要	The topic of satellite remote sensing of lake ice has gained considerable attention in recent years. Optical satellite data from the Moderate Resolution Imaging Spectroradiometer (MODIS) allow for the monitoring of lake ice cover (an Essential Climate Variable or ECV), and dates associated with ice phenology (freeze-up, break-up, and ice cover duration) over large areas in an era where ground-based observational networks have nearly vanished in many northern countries. Ice phenology dates as well as dates of maximum and minimum ice cover extent (for lakes that do not form a complete ice cover in winter or do not totally lose their ice cover in summer) are useful for assessing long-term trends and variability in climate, particularly due to their sensitivity to changes in near-surface air temperature. Existing knowledge-driven (threshold-based) retrieval algorithms for lake ice cover mapping that use top-of-atmosphere (TOA) reflectance products do not perform well under lower solar illumination conditions (i.e. large solar zenith angles), resulting in low TOA reflectance. This research assessed the capability of four machine learning classifiers (i.e. multinomial logistic regression, MLR; support vector machine, SVM; random forest, RF; gradient boosting trees, GBT) for mapping lake ice cover, water and cloud cover during both break-up and freeze-up periods using the MODIS/Terra L1B TOA (MOD02) product. The classifiers were trained and validated using samples collected from 17 large lakes across the Northern Hemisphere (Europe and North America); lakes that represent different characteristics with regards to area, latitude, freezing frequency, and ice duration. Following an accuracy assessment using random k-fold cross-validation (k = 100), all machine learning classifiers using a 7-band combination (visible, near-infrared and shortwave-infrared) were found to be able to produce overall classification accuracies above 94%. Both RF and GBT provided overall and class-specific accuracies above 98% and a more visually accurate depiction of lake ice, water and cloud cover. The two tree-based classifiers offered the most robust spatial transferability over the 17 lakes and performed consistently well across ice seasons. However, only RF was relatively insensitive to the choice of the hyperparameters compared to the other three classifiers. The results demonstrate the potential of RF for mapping lake ice cover globally from MODIS TOA reflectance data. © 2020 Elsevier Inc.
英文关键词	Classification; Lake ice; Machine learning; MODIS
语种	英语
scopus关键词	Adaptive boosting; Biology; Decision trees; Infrared devices; Lakes; Learning systems; Logistic regression; Mapping; Radiometers; Reflection; Remote sensing; Stream flow; Support vector machines; Support vector regression; Classification accuracy; K fold cross validations; Moderate resolution imaging spectroradiometer; Multinomial logistic regression; Near surface air temperature; Northern Hemispheres; Satellite remote sensing; Spatial transferability; Ice; accuracy assessment; assessment method; cloud cover; global change; ice cover; image classification; lake; machine learning; mapping method; MODIS; satellite data; spectral reflectance; Europe; North America
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179023
作者单位	Department of Geography and Environmental Management, University of Waterloo, Waterloo, ON N2L 3G1, Canada; H2O Geomatics Inc., Communitech Data Hub, Waterloo, ON N2L 1S7, Canada; Department of System Design Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
推荐引用方式 GB/T 7714	Wu Y.,Duguay C.R.,Xu L.. Assessment of machine learning classifiers for global lake ice cover mapping from MODIS TOA reflectance data[J],2021,253.
APA	Wu Y.,Duguay C.R.,&Xu L..(2021).Assessment of machine learning classifiers for global lake ice cover mapping from MODIS TOA reflectance data.Remote Sensing of Environment,253.
MLA	Wu Y.,et al."Assessment of machine learning classifiers for global lake ice cover mapping from MODIS TOA reflectance data".Remote Sensing of Environment 253(2021).