气候变化领域集成服务门户(CCPortal): Evaluating satellite retrieved fractional snow-covered area at a high-Arctic site using terrestrial photography

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DOI	10.1016/j.rse.2019.111618
	Evaluating satellite retrieved fractional snow-covered area at a high-Arctic site using terrestrial photography
	Aalstad K.; Westermann S.; Bertino L.
发表日期	2020
ISSN	00344257
卷号	239
英文摘要	The seasonal snow-cover is one of the most rapidly varying natural surface features on Earth. It strongly modulates the terrestrial water, energy, and carbon balance. Fractional snow-covered area (fSCA) is an essential snow variable that can be retrieved from multispectral satellite imagery. In this study, we evaluate fSCA retrievals from multiple sensors that are currently in polar orbit: the operational land imager (OLI) on-board Landsat 8, the multispectral instrument (MSI) on-board the Sentinel-2 satellites, and the moderate resolution imaging spectroradiometer (MODIS) on-board Terra and Aqua. We consider several retrieval algorithms that fall into three classes: thresholding of the normalized difference snow index (NDSI), regression on the NDSI, and spectral unmixing. We conduct the evaluation at a high-Arctic site in Svalbard, Norway, by comparing satellite retrieved fSCA to coincident high-resolution snow-cover maps obtained from a terrestrial automatic camera system. For the lower resolution MODIS retrievals, the regression-based retrievals outperformed the unmixing-based retrievals for all metrics but the bias. For the higher resolution sensors (OLI and MSI), retrievals based on NDSI thresholding overestimated the fSCA due to the mixed pixel problem whereas spectral unmixing retrievals provided the most reliable estimates across the board. We therefore encourage the operationalization of spectral unmixing retrievals of fSCA from both OLI and MSI. © 2019
英文关键词	Fractional snow-cover; Landsat 8; Mixed pixel; MODIS; NDSI; Optical; Photography; Sentinel-2; Unmixing
语种	英语
scopus关键词	Orbits; Photography; Pixels; Radiometers; Satellite imagery; Fractional snow covers; LANDSAT; Mixed pixel; MODIS; NDSI; Optical; Sentinel-2; Unmixing; Snow; aerial photography; Aqua (satellite); image resolution; Landsat thematic mapper; MODIS; satellite imagery; Sentinel; snow cover; Terra (satellite); Arctic; Svalbard; Svalbard and Jan Mayen
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/179445
作者单位	Department of Geosciences, University of Oslo, Oslo, Norway; Nansen Environmental and Remote Sensing Center, Bergen, Norway
推荐引用方式 GB/T 7714	Aalstad K.,Westermann S.,Bertino L.. Evaluating satellite retrieved fractional snow-covered area at a high-Arctic site using terrestrial photography[J],2020,239.
APA	Aalstad K.,Westermann S.,&Bertino L..(2020).Evaluating satellite retrieved fractional snow-covered area at a high-Arctic site using terrestrial photography.Remote Sensing of Environment,239.
MLA	Aalstad K.,et al."Evaluating satellite retrieved fractional snow-covered area at a high-Arctic site using terrestrial photography".Remote Sensing of Environment 239(2020).