适用于海岛的ICESat-2高程控制点提取方法  

A Method of Island Elevation Control Point Extraction Utilizing ICESat-2 Data

作　　者：戴泽源 张立华[1,2] 张林[3] 刘翔[1,2] 周寅飞 陈秋 DAI Zeyuan;ZHANG Lihua;ZHANG Lin;LIU Xiang;ZHOU Yinfei;CHEN Qiu(Department of Military Oceanography and Hydrography&Cartography,Dalian Naval Academy,Dalian 116018,China;Key Laboratory of Hydrographic Surveying and Mapping of PLA,Dalian Naval Academy,Dalian 116018,China;Department of Missiles and Shipboard Gunnery,Dalian Naval Academy,Dalian 116018,China;91001 Troops,Beijing 100071,China)

机构地区：[1]海军大连舰艇学院军事海洋与测绘系,大连116018 [2]海军大连舰艇学院海洋测绘工程军队重点实验室,大连116018 [3]海军大连舰艇学院导弹与舰炮系,大连116018 [4]91001部队,北京100071

出　　处：《地球信息科学学报》2023年第8期1559-1569,共11页Journal of Geo-information Science

基　　金：国家自然科学基金项目(41871369、41871295、41901320、42071439)。

摘　　要：针对海岛控制信息获取困难这一现实问题,提出一种基于ICESat-2 ATL08数据的海岛高程控制点提取方法。首先,通过水域掩膜标记与参考高程数据,去除数据中的海域点与粗差点,降低后续处理的数据量;然后,综合分析大气环境、信噪比、数据完整性等因素对高程值的影响,构建多参数约束初步筛选数据;最后,充分利用数据中的已有参数信息,结合控制点精度指标设计自适应地形阈值对高程控制点进行精细化提取。以波多黎各部分离岛及美属维尔京群岛高精度DEM(Digital Elevation Model)数据验证所提取高程控制点的准确性,实验结果表明:相较于原始数据,本文方法提取的高程控制点在平地、丘陵和山地区域的平均绝对误差与中误差分别从2.65 m/7.23 m、3.92 m/7.65 m、4.93 m/8.29 m减小为0.28 m/0.61 m、0.46 m/0.79 m、0.63 m/0.89 m;在保证精度的前提下,本文方法提取的高程控制点数量显著多于现有方法;利用本文方法,可从海岛区域提取一定数量、精度可靠的高程控制点,能为后续全球海图修测与质量控制提供有力数据支撑。To address the challenge of island elevation control information acquisition,a method of island elevation control point extraction based on ICESat-2 ATL08 data is proposed.Firstly,the sea area points and the gross error points in the data are deleted via the water area mask and the reference data,which reduces the volume of data waiting to be processed.Then,considering the impact of the atmospheric environment,signal-tonoise ratio,and data integrity on the accuracy of elevation control points,the data are preliminary screened with multiparameter restrictions.Finally,an adaptive terrain threshold is determined to extract the elevation control points based on the precision index.The accuracy of the extracted elevation control points are validated using high-precision Digital Elevation Model(DEM)data from various islands in Puerto Rico's outlying islands and the United States Virgin Islands.The experimental results show that,compared to the original data,the Mean Absolute Error(MAE)and Root Mean Square Error(RMSE)of the elevation control points extracted by the proposed method in the flat,hilly,and mountainous regions are reduced from 2.65 m/7.23 m,3.92 m/7.65 m,and 4.93 m/8.29 m to 0.28 m/0.61 m,0.46 m/0.79 m,and 0.63 m/0.89m,respectively.On the premise of ensuring accuracy,the number of elevation control points extracted by the proposed method is significantly larger than that of the existing methods.Our proposed method allows for extraction of a specific number of reliable elevation control points from the island region,which provides a solid foundation for the global nautical chart renovation and quality control.

关 键 词：海岛(礁) ICESat-2 ATL08 高程控制点 自适应阈值 星载激光雷达 光子计数 海图修测 

分 类 号：P229[天文地球—大地测量学与测量工程] P224[天文地球—测绘科学与技术]