The evaluation of FY-3C snow products in the Tibetan Plateau

doi:10.6046/gtzyyg.2020102

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Abstract

In order to understand the regional reliability of the Fengyun-3C(FY-3C) satellite snow products, the authors used the snow cover data of 118 meteorological stations in the Tibetan Plateau from October 1, 2018 to April 30, 2019 to evaluate the snow cover (MULSS_SNC) and snow water equivalent (MWRIX_SWE) products. The results show that, for snow cover pixels of MULSS_SNC and MWRIX_SWE, the accuracy rate is 87.18% and 72.32% respectively, the recall rate is 66.67% and 49.63% respectively, the false rate is 12.81% and 27.68% respectively, and the missing rate is 33.33% and 50.37% respectively. In terms of mixed pixels or pixels with snow depth less than 0.5 cm, both MULSS_SNC and MWRIX_SWE tend to identify with no snow, and the missing rate of snow depth less than 1cm is up to 60%. When the snow depth of MULSS_SNC is more than 2cm, the recall rate can reach 89.09%. However, for MWRIX_SWE, only when the snow depth is more than 5cm can the snow recall rate reach 63.37%. The snow depth in the Tibetan Plateau from MWRIX_SWE has a large error with ground observations, and there is no linear positive correlation, so it is not recommended to use it directly.

Keywords MULSS_SNC MWRIX_SWE evaluation Tibetan Plateau

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TP79

Issue Date: 18 March 2021

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	Wenbin MIN
	Jun PEN
	Shiying Li

Cite this article:

Wenbin MIN,Jun PEN,Shiying Li. The evaluation of FY-3C snow products in the Tibetan Plateau[J]. Remote Sensing for Land & Resources, 2021, 33(1): 145-151.

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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2020102 OR https://www.gtzyyg.com/EN/Y2021/V33/I1/145

Fig.1 Distribution of snow observation stations in Qinghai-Tibet Plateau

Tab.1 The identification results of MULSS_SNC

Tab.2 The identification results of MWRIX_SWE

Tab.3 The evaluation results of FY3C snow cover products with different snow depth

Tab.4 The identification results of synthetic products of MULSS_SNC and MWRIX_SWE

Fig.2 The missing rate of FY3C snow cover products with different snow depth

Fig.3 The scatter map of snow depth from ground observation and MWRIX_SWE

Fig.4 The scatter map of snow depth from ground observation and satellite inversion below 60cm

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