Evaluation of Water Level Estimation in the Upper Yangtze River from ICESat-2 Data

Guo, Xiaozu; Jin, Shuanggen; Zhang, Zhijie

doi:10.1109/piers53385.2021.9695146

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…In 2022, its data were used in seven studies for the extraction of inland water levels, a number substantially higher than any other mission's application. It is shown that laser altimeters have a unique role in monitoring water level changes in most rivers and lakes, especially for small ones, benefitting from their higher sampling densities and much smaller footprint than radar altimeters [93][94][95][96]. However, a significant limitation to their use is the temporal resolution, e.g., 91-day repeat cycle for ICESat-2 satellite, which is significantly lower than in radar altimeters.…”

Section: Discussionmentioning

confidence: 99%

“…As can be understood ICESat-2 has high spatial resolution and high density of observation. Thus, ICESat/ICESat-2 has a unique role in monitoring water level changes in most rivers and lakes, especially for small ones benefitting from their small footprints [93][94][95][96]. However, the water levels from ICESat-2 are much more accurate than those from ICESat [97].…”

Section: Laser Altimetry Satellite Missionsmentioning

confidence: 99%

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Inland Water Level Monitoring from Satellite Observations: A Scoping Review of Current Advances and Future Opportunities

Kossieris,

Tsiakos,

Tsimiklis

et al. 2024

Remote Sensing

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Inland water level and its dynamics are key components in the global water cycle and land surface hydrology, significantly influencing climate variability and water resource management. Satellite observations, in particular altimetry missions, provide inland water level time series for nearly three decades. Space-based remote sensing is regarded as a cost-effective technique that provides measurements of global coverage and homogeneous accuracy in contrast to in-situ sensors. The advent of Open-Loop Tracking Command (OLTC), and Synthetic Aperture Radar (SAR) mode strengthened the use of altimetry missions for inland water level monitoring. However, it is still very challenging to obtain accurate measurements of water level over narrow rivers and small lakes. This scoping systematic literature review summarizes and disseminates the research findings, highlights major results, and presents the limitations regarding inland water level monitoring from satellite observations between 2018 and 2022. Following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guideline and through a double screening process, 48 scientific publications were selected meeting the eligibility criteria. To summarize the achievements of the previous 5 years, we present fundamental statistical results of the publications, such as the annual number of publications, scientific journals, keywords, and study regions per continent and type of inland water body. Also, publications associated with specific satellite missions were analyzed. The findings show that Sentinel-3 is the dominant satellite mission, while the ICESat-2 laser altimetry mission has exhibited a high growth trend. Furthermore, publications including radar altimetry missions were charted based on the retracking algorithms, presenting the novel and improved methods of the last five years. Moreover, this review confirms that there is a lack of research on the collaboration of altimetry data with machine learning techniques.

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Section: Discussionmentioning

confidence: 99%

Section: Laser Altimetry Satellite Missionsmentioning

confidence: 99%

Inland Water Level Monitoring from Satellite Observations: A Scoping Review of Current Advances and Future Opportunities

Kossieris,

Tsiakos,

Tsimiklis

et al. 2024

Remote Sensing

View full text Add to dashboard Cite

show abstract

“…Laser altimetry technology, a potent active remote sensing method [1], has made considerable progress across diverse domains, including surveying and mapping [2], river and lake research [3], oceanography [4], polar glacier observation [5], and planetary exploration [6], attributed to its superior measurement precision and exceptional spatial and temporal resolution. Nevertheless, the emission and operational phases of laser altimeters 2 of 23 may be subject to disturbances from vibration, abrupt shifts in the orbital environment, and environmental thermal fluctuations [7].…”

Section: Introductionmentioning

confidence: 99%

Fine Calibration Method for Laser Altimeter Pointing and Ranging Based on Dense Control Points

Xu,

Mo,

Wang

et al. 2024

Remote Sensing

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Satellite laser altimetry technology, a novel space remote sensing technique, actively acquires high-precision elevation information about the Earth’s surface. However, the accuracy of laser altimetry can be compromised by alterations in the satellite-ground environment, thermal dynamics, and cosmic radiation. These factors may induce subtle variations in the installation and internal structure of the spaceborne laser altimeter on the satellite platform, diminishing measurement precision. In-orbit calibration is thus essential to enhancing the precision of laser altimetry. Through collaborative calculations between satellite and ground stations, we can derive correction parameters for laser pointing and ranging, substantially improving the accuracy of satellite laser altimetry. This paper introduces a sophisticated calibration method for laser altimeter pointing and ranging that utilizes dense control points. The approach interpolates discrete ground control point data into continuous simulated terrain using empirical Bayesian kriging, subsequently categorizing the data for either pointing or ranging calibration according to their respective functions. Following this, a series of calibration experiments are conducted, prioritizing “pointing” followed by “ranging” and continuing until the variation in the ranging calibration results falls below a predefined threshold. We employed experimental data from ground control points (GCPs) in Xinjiang and Inner Mongolia, China, to calibrate the GaoFen-7 (GF-7) satellite Beam 2 laser altimeter as per the outlined method. The calibration outcomes were then benchmarked against those gleaned from infrared laser detector calibration, revealing disparities of 1.12 s in the pointing angle and 2 cm in the ranging correction value. Post validation with ground control points, the measurement accuracy was refined to 0.15 m. The experiments confirm that the proposed calibration method offers accuracy comparable to that of infrared laser detector calibration and can facilitate the updating of 1:10,000 topographic maps utilizing stereo optical imagery. Furthermore, this method is more cost-effective and demands fewer personnel for ground control point collection, enhancing resource efficiency compared to traditional infrared laser detector calibration. The proposed approach surpasses terrain-matching limitations when calibrating laser ranging parameters and presents a viable solution for achieving frequent and high-precision in-orbit calibration of laser altimetry satellites.

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Research on key factors of satellite laser pointing calibration based on terrain matching: a case of GF-7 satellite

Xu,

Xie,

et al. 2024

Geocarto International

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Evaluation of Water Level Estimation in the Upper Yangtze River from ICESat-2 Data

Cited by 5 publications

References 5 publications

Inland Water Level Monitoring from Satellite Observations: A Scoping Review of Current Advances and Future Opportunities

Inland Water Level Monitoring from Satellite Observations: A Scoping Review of Current Advances and Future Opportunities

Fine Calibration Method for Laser Altimeter Pointing and Ranging Based on Dense Control Points

Research on key factors of satellite laser pointing calibration based on terrain matching: a case of GF-7 satellite

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