Bulletin of Surveying and Mapping ›› 2025, Vol. 0 ›› Issue (4): 96-101.doi: 10.13474/j.cnki.11-2246.2025.0416

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The water level change of Namco Lake based on ICESat-2 height difference data

LIU Mingqi1, CHEN Guodong2,3, ZHANG Zhijie2,3   

  1. 1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;
    2. School of Geographical Science and Geomatics Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;
    3. Suzhou Key Laboratory of Spatial Information Intelligence Technology and Application, Suzhou 215009, China
  • Received:2024-08-12 Published:2025-04-28

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Abstract: Lake water level monitoring is one of the important application scenarios of satellite altimetry technology. However, most studies on lake water level monitoring using satellite altimetry technology do not take into account the impact of geoid residuals on the results. To address this issue, this study selects ATL13 data from ICESat-2 from October 2018 to August 2023 to analyze the water level changes of Nam Co Lake using the height difference method. The results show that the water level changes of Nam Co Lake obtainedby using the intersection method and repeated orbit data can effectively reduce the impact of geoid residuals and improve the accuracy of water level monitoring, with a correlation coefficient of up to 0.92 with the measured water level. Through the analysis of the water level changes of Nam Co Lake, it is found that its water level rises in summer every year and is relatively stable in winter, with an overall upward trend. This study proves the accuracy of detecting lake water levels by combining satellite altimetry intersections and repeated orbit data, providing reliable data support for hydrological research on inland lakes.

Key words: ICESat-2, height difference method, water level monitoring

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