| DOI: | 10.5194/tc-8-1639-2014
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| Scopus记录号: | 2-s2.0-84906997291
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| 论文题名: | A sea ice concentration estimation algorithm utilizing radiometer and SAR data |
| 作者: | Karvonen J
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| 刊名: | Cryosphere
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| ISSN: | 19940416
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| 出版年: | 2014
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| 卷: | 8, 期:5 | | 起始页码: | 1639
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| 结束页码: | 1650
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| 语种: | 英语
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| 英文关键词: | algorithm
; bootstrapping
; concentration (composition)
; digital mapping
; polarization
; radiometer
; sea ice
; synthetic aperture radar
; Germany
; Hamburg [Germany]
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| 英文摘要: | We have studied the possibility of combining the high-resolution synthetic aperture radar (SAR) segmentation and ice concentration estimated by radiometer brightness temperatures. Here we present an algorithm for mapping a radiometer-based concentration value for each SAR segment. The concentrations are estimated by a multi-layer perceptron (MLP) neural network which has the AMSR-2 (Advanced Microwave Scanning Radiometer 2) polarization ratios and gradient ratios of four radiometer channels as its inputs. The results have been compared numerically to the gridded Finnish Meteorological Institute (FMI) ice chart concentrations and high-resolution AMSR-2 ASI (ARTIST Sea Ice) algorithm concentrations provided by the University of Hamburg and also visually to the AMSR-2 bootstrap algorithm concentrations, which are given in much coarser resolution. The differences when compared to FMI daily ice charts were on average small. When compared to ASI ice concentrations, the differences were a bit larger, but still small on average. According to our comparisons, the largest differences typically occur near the ice edge and sea-land boundary. The main advantage of combining radiometer-based ice concentration estimation and SAR segmentation seems to be a more precise estimation of the boundaries of different ice concentration zones. © Author(s) 2014. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/74795
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| Appears in Collections: | 影响、适应和脆弱性
气候变化与战略
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作者单位: | Finnish Meteorological Institute (FMI), PB 503, Helsinki, Finland
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| Recommended Citation: | |
Karvonen J. A sea ice concentration estimation algorithm utilizing radiometer and SAR data[J]. Cryosphere,2014-01-01,8(5)
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