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纸质出版日期： 2021-03-07 ，
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史凯琦，邹斌，陈树果，薛程，石立坚，张亭禄.2021.中分辨率成像光谱仪的海冰密集度遥感反演.遥感学报，25（3）： 753-764
Shi K Q，Zou B，Chen S G，Xue C，Shi L J and Zhang T L. 2021. Remote sensing inversion of sea ice concentration by a middle-resolution imaging spectrometer. National Remote Sensing Bulletin， 25（3）：753-764
海冰信息在船舶运输、天气预报和全球气候预测等领域都起着重要作用。一直以来微波遥感是卫星监测海冰密集度的主要手段，目前基于可见光遥感的中分辨率海冰密集度产品还较少，其中只有NOAA发布了相关业务化产品，但其所采用的算法对低密集度海冰反演准确性仍存在提升空间。本文在Liu提出的算法基础上进行改进，提出了最邻近像素法确定纯冰典型反射率的改进算法，使用MODIS数据作为数据源计算海冰密集度，并使用30 m空间分辨率的Landsat 8 OLI数据作为验证数据进行对比验证。结果表明改进算法可以提高低密集度海冰的反演准确性，改善Liu算法存在过高估计的不足，在海冰密集度0—50%的情况下，Liu算法的平均偏差为13%，标准偏差为38%，改进算法的平均偏差为5%，标准偏差为32%；在海冰密集度0—100%的情况下，Liu算法的平均偏差为4%，标准偏差为32%，改进算法的平均偏差为-3%，标准偏差为28%。针对冰水过渡、碎冰覆盖等低密集度海冰区域，改进算法准确性更高。
Sea ice concentration
which refers to the percentage of sea ice in an area
is an important parameter describing the characteristics of sea ice. Remote sensing monitoring of sea ice is crucial to understand the role of polar regions in the global climate system and global warming. Sea ice information is of great importance in ship transportation
weather forecasting
and global climate forecast. At present
passive microwave radiometers are the main means of monitoring sea ice concentration; however
because microwaves present wavelength limitations
conventional sea ice concentration products cannot be used in practical applications in small areas. Visible-light-infrared remote sensing can retrieve sea ice concentrations
and its advantages over other sensing methods include high spatial resolution.
This work focuses on the development of a sea ice concentration algorithm suitable for medium-resolution images. Few medium-resolution sea ice concentration products based on visible-light remote sensing are available
and only NOAA has released relevant operational products. However
the accuracy of its algorithm for low-concentration sea ice inversion is low. This paper proposes an improved algorithm based on the existing algorithm to determine the ice node via the nearest-pixel method. MODIS data are used as a data source to calculate the sea ice concentration
and Landsat 8 OLI data with a spatial resolution of 30 m are used for comparative verification.
Results show that the improved algorithm can improve the inversion accuracy of low-concentration sea ice. The Liu algorithm has the disadvantage of overestimation. In the case of sea ice concentrations of 0% — 50%
the average deviation of the Liu algorithm is 13%
and its standard deviation is 38%. By comparison
the average deviation of the improved algorithm is 5%
and its standard deviation is 32%. In the case of sea ice concentrations of 0% — 100%
the average deviation of the Liu algorithm is 4%
and its standard deviation is 32%. By comparison
the average deviation of the improved algorithm is -3%
and its standard deviation is 28%. In the case of sea ice concentrations of 0% —50%
the accuracy of the improved algorithm is better than that of the Liu algorithm. When the sea ice concentration is close to 100%
the results of the two algorithms are highly similar. Overall
the improvement effect of the proposed algorithm is related to the actual sea ice concentration
and the improved algorithm is more accurate than the Liu algorithm for low-concentration sea ice regions
such as ice-water transitions and broken ice coverage.
遥感海冰冰水识别MODIS最邻近像素海冰密集度算法
remote sensingsea iceice water recognitionMODISnearest pixelSIC algorithm
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