Improve the Zy-3 Height Accuracy Using Icesat/Glas Laser Altimeter Data

Li, Guoyuan; Tang, Xinming; Gao, Xiaoming; Zhang, Chongyang; Li, Tao

doi:10.5194/isprs-archives-xli-b1-37-2016

Cited by 11 publications

(8 citation statements)

References 23 publications

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“…Building on this heritage, the next generation of space-borne Advanced Topographic Laser Altimeter System (ICESat-2/ATLAS) is seeking to monitor a diverse range of geophysical phenomena at unprecedented levels of precision and accuracy by photon-counting technolgy [5] . Comparing with America, though China started later in this aspect, currently ZY3-02 as the first experimental altimeter acquired 44 tracks effective data, and the combined adjustment of its laser and image data can actually improve the accuracy of uncontrolled elevation [6]. .…”

Section: Introductionmentioning

confidence: 99%

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Analyzing the Impact of Different Filtering Methods on Satellite Altimetry Full Waveform Decomposition

et al. 2020

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Filtering is an essential step in the denoising of satellite altimetry full waveform data, since any deformation and distortion in the shape of the waveform can cause errors in range estimation and further waveform decomposition will also be adversely affected. This paper evaluated comprehensive performance of the popular filtering approaches like Gaussian filter, Taubin filter, Wavelet filter, and EMD based filter by simulated waveform data and ICESat/GLAS waveform. Firstly, according to the principle of each filter, the optimal parameters of filtering algorithm by ergodic tests were selected, then the Gaussian function using Levenberg-Marquardt method was used to fit full waveform to exact waveform parameters (i.e. peak amplitude, position, and half-width). Thirdly, through comparing SNR, RMSE of the pre and post filtering simulation waveform, and the consistency ratio, the average error of peak amplitude, position, and half-width in each Gaussian components of the fitted simulation waveform, verified the effectiveness of these filters and analyzed their influence on decomposition accuracy. Both the simulation experiments and ICESat/GLAS experimental results suggested that the Taubin filter had superior performance with the lowest peak position error, which turns out it has advantage in full waveform denoising and contributes to better full waveform decomposition. However, it introduces more parameters needed to be selected. The self-adaptive EMD based approach has the highest consistency, which shows EMD-based method is more suitable for the denoising of satellite altimetry full waveform decomposition.

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Section: Introductionmentioning

confidence: 99%

“…Parameters set of simulation full waveform signal SNR_set = [10, 15, 20, 25, 30, 35, 40] Amp_set = [0.1, 0.15, 0.2, 0.25, 0.3,0. 4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0] Loc_set = [100, 130, 160, 190, 220, 250, 280, 310, 340, 370,400,430, 460, 500] sigma_set =[6,7,8,9,10, 15, 20, 25, 30, 35, 40] …”

mentioning

confidence: 99%

Analyzing the Impact of Different Filtering Methods on Satellite Altimetry Full Waveform Decomposition

et al. 2020

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“…It is the second Chinese stereo‐mapping satellite, following the launch of ZY3‐01 in 2012. ZY3‐02 is the first Chinese satellite equipped with a laser altimeter for earth observation (Li et al., a; Tang et al., ). (Li et al, , had to use GLAS laser altimeter measurements with ZY3‐01 data.)…”

Section: Introductionmentioning

confidence: 99%

In‐orbit geometric calibration and experimental verification of the ZY3‐02 laser altimeter

Xie

Tang

et al. 2018

The Photogrammetric Record

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ZY3-02 is the first Chinese earth-observation satellite equipped with a laser altimeter, designed to assist stereo-image mapping elevations. Launch vibrations, the space environment and other factors, both expected and unexpected, cause bias in the designed ranging and pointing of the laser altimeter, influencing its height measurement accuracy. This paper proposes an in-orbit geometric calibration model which considers this bias as unknown systematic errors. The unknown parameters were calibrated by the minimum ranging error principle using laser spot geolocation data captured by a ground-based laser detector array. Based on precise orbit and attitude data, the precise geolocation information of the laser footprints could be obtained. Validation experiments show that the elevation precision of the laser altimeter can reach 1 m.

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“…A high-resolution remote sensing, surveying, and mapping satellite system can deliver high precise image products with precise auxiliary data, such as satellite attitude and orbit data. Surveying and mapping satellite always has a small base-to-height ratio less than 1, so elevation measuring accuracy will be a bottleneck in satellite photogrammetry [ 4 , 5 ]. In the past, we could apply ground control points (GCPs) or ground elevation control points to reduce elevation error of satellite image products when the covered area was small, but now we cannot apply this method to global surveying and mapping [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, there are still some improvements in ZY3-02 compared to ZY3-01: the resolution of the multi-spectral camera is better, and ZY3-02 has an extra small experimental laser altimeter. The small laser altimeter, carried by ZY3-02, is designed to conduct a ground verification experiment to determine whether the altimeter can improve the elevation accuracy of surveying and mapping satellite image products [ 4 ]. Similarly, we should carry out the on-orbit geometric calibration test as the first step.…”

Section: Introductionmentioning

confidence: 99%

ZY3-02 Laser Altimeter Footprint Geolocation Prediction

Xie

Tang

et al. 2017

Sensors

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Successfully launched on 30 May 2016, ZY3-02 is the first Chinese surveying and mapping satellite equipped with a lightweight laser altimeter. Calibration is necessary before the laser altimeter becomes operational. Laser footprint location prediction is the first step in calibration that is based on ground infrared detectors, and it is difficult because the sample frequency of the ZY3-02 laser altimeter is 2 Hz, and the distance between two adjacent laser footprints is about 3.5 km. In this paper, we build an on-orbit rigorous geometric prediction model referenced to the rigorous geometric model of optical remote sensing satellites. The model includes three kinds of data that must be predicted: pointing angle, orbit parameters, and attitude angles. The proposed method is verified by a ZY3-02 laser altimeter on-orbit geometric calibration test. Five laser footprint prediction experiments are conducted based on the model, and the laser footprint prediction accuracy is better than 150 m on the ground. The effectiveness and accuracy of the on-orbit rigorous geometric prediction model are confirmed by the test results. The geolocation is predicted precisely by the proposed method, and this will give a reference to the geolocation prediction of future land laser detectors in other laser altimeter calibration test.

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Improve the Zy-3 Height Accuracy Using Icesat/Glas Laser Altimeter Data

Cited by 11 publications

References 23 publications

Analyzing the Impact of Different Filtering Methods on Satellite Altimetry Full Waveform Decomposition

Analyzing the Impact of Different Filtering Methods on Satellite Altimetry Full Waveform Decomposition

In‐orbit geometric calibration and experimental verification of the ZY3‐02 laser altimeter

ZY3-02 Laser Altimeter Footprint Geolocation Prediction

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