基于高度计数据的南极冰水边界识别算法研究
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摘要
海冰边缘线是南极海冰监测的重要内容之一。本文基于ENVI RA-2(ENVISAT Radar Altimeter 2)高度计数据开展了南极海冰边缘线提取方法研究。首先根据海冰和海水后向散射系数的不同,利用其各自方差对两者进行区分,获得了冰水分界线;其次通过ENVISAT-ASAR(ENVISAT-Advanced Synthetic Aperture Radar)数据和冰况图对提取的海冰边缘线的正确性进行了验证;最后简要分析了误差存在的原因。研究结果表明,高度计数据在提取大范围海冰边缘线方面具有优势。
Sea ice edge is one of the important contents of Antarctic sea ice detection. In this paper,the extraction method of Antarctic sea ice edge was performed using ENVI RA-2 altimeter. The difference between backscattering coefficients of sea ice and sea water could be denoted by respective variance(S2). Sea ice edge was extracted by S2. The resultswerevalidated by those ASAR data and the ice edge code. And its error was analyzed simply. It was indicated that altimeter had an advantage of detecting sea ice edge of large area.
Sea ice edge is one of the important contents of Antarctic sea ice detection. In this paper,the extraction method of Antarctic sea ice edge was performed using ENVI RA-2 altimeter. The difference between backscattering coefficients of sea ice and sea water could be denoted by respective variance(S2). Sea ice edge was extracted by S2. The resultswerevalidated by those ASAR data and the ice edge code. And its error was analyzed simply. It was indicated that altimeter had an advantage of detecting sea ice edge of large area.
引文
[1]纪永刚,张杰,孟俊敏.用AMSR数据极化比PSSM算法检测渤海海冰边缘线[J].海洋科学进展,2007,25(2):226-232.
[2]Gudmandsen P E.Application of microwave remote sensing to studies of sea ice[J].Philosopical Transactions of the Royal Society London,1983,A309:433-445.
[3]Robin G Q,Drewry D J,Squire V A.Satellite observations of polar ice fields[J].Philosophical Transactions of The Royal Society London,1983,A309:447-461.
[4]Robin G Q.Polar research by remote sensing[J].Physics Bulletin,1984,35:242-244.
[5]Squire V A,Drewry D J,Cowan A M,et al.Cryospheric data products available through satellite altimetry[J].Proceeding of the ERS-1 radar altimeter data products workshop,1984,SP-222:51-57.
[6]Thomas R H.Observing polar regions from space[J].Recent advances in Civil space remote sensing,Society of Photo-optical Instrument Engineering,1984,481:165-171.
[7]Simil M.SAR image segmentation by a two-scale contextual classifier[J].Image and signal processing for remote sensing,Proc,1994,2315:434-443.
[8]Scheuchl B,Caves R,Cumming I,et al.Automated sea ice classification using spaceborne polarimetric SAR data[J].Geoscience and Remote Sensing Symposium.IEEE 2001 International,2001,7:3117-3119.
[9]European Space Agency.Envisat RA2-MWR Product Handbook2.2[EB/OL].[2007-02-27].https://earth.esa.int/handbooks/.
[2]Gudmandsen P E.Application of microwave remote sensing to studies of sea ice[J].Philosopical Transactions of the Royal Society London,1983,A309:433-445.
[3]Robin G Q,Drewry D J,Squire V A.Satellite observations of polar ice fields[J].Philosophical Transactions of The Royal Society London,1983,A309:447-461.
[4]Robin G Q.Polar research by remote sensing[J].Physics Bulletin,1984,35:242-244.
[5]Squire V A,Drewry D J,Cowan A M,et al.Cryospheric data products available through satellite altimetry[J].Proceeding of the ERS-1 radar altimeter data products workshop,1984,SP-222:51-57.
[6]Thomas R H.Observing polar regions from space[J].Recent advances in Civil space remote sensing,Society of Photo-optical Instrument Engineering,1984,481:165-171.
[7]Simil M.SAR image segmentation by a two-scale contextual classifier[J].Image and signal processing for remote sensing,Proc,1994,2315:434-443.
[8]Scheuchl B,Caves R,Cumming I,et al.Automated sea ice classification using spaceborne polarimetric SAR data[J].Geoscience and Remote Sensing Symposium.IEEE 2001 International,2001,7:3117-3119.
[9]European Space Agency.Envisat RA2-MWR Product Handbook2.2[EB/OL].[2007-02-27].https://earth.esa.int/handbooks/.