Sea Ice Distribution Detection Based on FY-3 Satellite MWRI Data

doi:10.13474/j.cnki.11-2246.2018.0315

Abstract

Abstract: Based on the MWRI 19 GHz data from the FY-3 microwave imager (MWRI),a new method for detecting the distribution of Arctic sea ice is proposed,using the most polarized characteristics of seawater and sea ice at 19 GHz.Then the polarization difference of 19 GHz is processed by Otsu algorithm to get the classification threshold of seawater and sea ice,and the Arctic sea ice distribution is obtained.The results of sea ice distribution are obtained by taking the data of January 2016 as an example to verify the distribution results of Arctic ice distribution with the North American Ice Data Center (NSIDC).The results show that the average sea ice extent in January based on FY-3 MWRI is 12.905×10⁶ km²,and the sea ice extent provided by NSIDC is 13.493×10⁶ km²,only a difference of 4.35%.And the daily growth rate of the sea ice extent are 0.038 4×10⁶ and 0.041 9×10⁶ km²,respectively.Therefore,it is feasible to detect Arctic sea ice distribution based on the difference of 19 GHz vertical polarization and horizontal polarization combined with Otsu algorithm.

Key words: FY-3, Otsu algorithm, sea ice distribution, polarization, MWRI

CLC Number:

P237

WU Zhankai, WANG Xingdong, WANG Cheng. Sea Ice Distribution Detection Based on FY-3 Satellite MWRI Data[J]. 测绘通报, 2018, 0(10): 56-60,65.

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