ICESat-2高程信息辅助下的北极冰区航线规划  

Route Planning in the Arctic Ice Region Assisted by ICESat-2 Elevation Information

作　　者：赵羲[1,2] 霍瑞 陈亦卓 马跃[3] 季青[1,2] 庞小平 ZHAO Xi;HUO Rui;CHEN Yizhuo;MA Yue;JI Qing;PANG Xiaoping(Chinese Antarctic Center of Surveying and Mapping,Wuhan University,Wuhan 430079,China;Key Laboratory of Polar Surveying and Mapping,National Administration of Surveying,Mapping and Geoinformation,Wuhan University,Wuhan 430079,China;Electronic Information School,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学中国南极测绘研究中心,湖北武汉430079 [2]武汉大学极地测绘科学国家测绘地理信息局重点实验室,湖北武汉430079 [3]武汉大学电子信息学院,湖北武汉430072

出　　处：《武汉大学学报（信息科学版）》2024年第9期1610-1620,共11页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金(41876223);高分遥感测绘应用示范系统(42-Y30B04-9001-19/21)。

摘　　要：为了实现北极航道重点区域海冰冰情的精准监测,高分辨率的海冰厚度信息必不可少,而目前普遍存在的千米级分辨率的海冰厚度数据无法满足该需求。针对以上问题,借助冰、云和陆地高程卫星(ice,cloud,and land elevation satellite-2,ICESat-2)测高数据沿轨间隔密集的优势,尝试建立ICESat-2 ATL10海冰干舷产品和哨兵2号(Sentinel-2)高分辨率影像反照率之间的回归模型。利用此模型获取密集分布的海冰干舷信息,通过静力平衡方程模型得到高分辨率的海冰厚度,结合基于Sentinel-2影像获取的高分辨率海冰密集度,对船舶进行北极航道小尺度区域下的适航性分析并规划最优航线。研究表明,ATL10海冰干舷值和Sentinel-2反照率拟合得到的回归模型具有较好的拟合精度,R^(2)均高于0.5,平均偏差均小于0.05 m,均方根误差均小于0.2 m。此外,高分辨率海冰参数信息对真实冰情细节之处的描述更加准确,尤其是在低分辨率海冰参数结果中较难体现浮冰间细小冰间水道的分布情况,因此所提高分辨率海冰参数反演方法可以为冰区船舶规划出更加精确的航行路线。Objectives:To achieve the accurate monitoring of sea ice conditions in the key area of Arctic passage,high resolution sea ice thickness is essential.However,sea ice thickness with kilometer-scale resolution cannot meet the requirement at present.Methods:Considering the relationship between sea ice thickness and image albedo,this paper tried to establish a regression model between the ICESat-2 ATL10 sea ice freeboard product and the high resolution Sentinel-2 optical image albedo by taking advantage of the intensive altimetry data of ICESat-2 along the orbit to obtain dense sea ice freeboard.Based on high resolution sea ice thickness calculated from dense freeboard with the hydrostatic equilibrium model and combined with high resolution sea ice concentration derived from Sentinel-2 image,we classified ice areas into different navigational categories according to the ice-break capability of ship and compared optimal route design at multiple spatial scales.Results:Regression models established from the ATL10 sea ice freeboard and the Sentinel-2 image albedo have good fitting accuracy.The R^(2) of the regression model is higher than 0.5,the average deviation is less than 0.05 m,and the root mean square error of the accuracy validation is less than 0.2 m.High resolution sea ice parameters derived by the proposed method can describe the distribution of fine leads between floating ice which are difficult to be captured by low resolution sea ice parameters.Conclusions:High resolution sea ice parameters can describe the details of sea ice conditions more accurately.Therefore,the proposed high resolution inversion method of sea ice parameters can improve the capability of navigation planning for ships in Arctic passage,further improving the navigation safety.

关 键 词：ICESat-2 海冰密集度 海冰厚度 航线规划 

分 类 号：P237[天文地球—摄影测量与遥感]