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

被引：0
|
作者：
Dai Z. [1 ,2 ]
Zhang L. [1 ,2 ]
Zhang L. [1 ,2 ]
Liu X. [1 ,2 ]
Zhou Y. [1 ,2 ]
Chen Q. [4 ]
机构：
[1] Department of Military Oceanography and Hydrography & Cartography, Dalian Naval Academy, Dalian
[2] Key Laboratory of Hydrographic Surveying and Mapping of PLA, Dalian Naval Academy, Dalian
[3] Department of Missiles and Shipboard Gunnery, Dalian Naval Academy, Dalian
[4] 91001 Troops, Beijing
来源：
Journal of Geo-Information Science | 2023年 / 25卷 / 08期
基金：
中国国家自然科学基金;
关键词：
adaptive threshold; ATL08; elevation control point; ICESat-2; island; nautical chart renovation; photon counting; spaceborne LiDAR;
D O I：
10.12082/dqxxkx.2023.220868
中图分类号：
学科分类号：
摘要：
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-to-noise 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. © 2023 Journal of Geo-Information Science. All rights reserved.
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页码：1559 / 1569
页数：10
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