Mountain glacier displacement estimation using a DEM-assisted offset tracking method with ALOS/PALSAR data

Yan, Song Y.; Guo, Huadong; Liu, Guang; Ruan, Zhixing

doi:10.1080/2150704x.2012.754561

Cited by 32 publications

(27 citation statements)

References 23 publications

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“…The ice motion related offset signal is usually estimated by removing the whole trend of the motion (i.e., the long wavelength signal) associated with the orbit and sensor attitude from the results of the SAR imagery matching operation. Before being converted to ice motion, the topographic-dependent distortion associated with the rugged terrain in mountainous glacial areas and the residual trend should be compensated for and removed with the DEM-assisted method followed by a linear polynomial model [5,44]. In order to generate reasonable results, a filter is usually employed on the magnitude and flow direction of the obtained motion field.…”

Section: Intensity-based Method: Ptmentioning

confidence: 99%

“…Compared with Cand X-band data, L-band PALSAR images have been used in many glacial regions and are capable of giving an accurate and complete coverage estimation for moving ice at a large scale [5,[9][10][11]. Details of the PALSAR imagery pair used in this paper are listed in Table 1.…”

Section: Datasetsmentioning

confidence: 99%

“…However, the MAI result is much more continuous, despite being seriously limited by the low coherence on some parts of the glacier surface. In addition, the statistical characteristic of the residual value on the non-glacial area can also be computed for accuracy estimation of the integrated method, according to the basic relative measuring principle of an integrated method [4,5]. …”

Section: Accuracy Estimation and Error Analysismentioning

confidence: 99%

“…According to the D-InSAR result, the accuracy of the PT method can also be ensured because of the existing overlapping region. In addition, the accuracy of the PT method can be statistically yielded by the residual values on the non-glacial area, which are computed according to the basic principle of the PT method as it is a relative measurement technique [5,22,42]. The statistical values in non-glacial region for results of D-InSAR, MAI, and PT methods area are, respectively, 0.09 m, 0.34 m, and 0.5 m, which could be considered as their accuracies.…”

Section: Accuracy Estimation and Error Analysismentioning

confidence: 99%

“…Characterized by steep terrain and a relatively small size, mountain glaciers located at low latitudes, such as high-mountain Asia, are much more sensitive to global climate change than glaciers in polar regions [1][2][3]. The intense activity of mountain glaciers can also present the potential for danger due to the rapid ice movement [4,5]. Mountain glaciers can also be valuable sources of fresh water, and directly impact human livelihoods, infrastructure security, and water levels [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Deriving Ice Motion Patterns in Mountainous Regions by Integrating the Intensity-Based Pixel-Tracking and Phase-Based D-InSAR and MAI Approaches: A Case Study of the Chongce Glacier

et al. 2016

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Abstract:As a sensitive indicator of climate change, mountain glacier dynamics are of great concern, but the ice motion pattern of an entire glacier surface cannot be accurately and efficiently generated by the use of only phase-based or intensity-based methods with synthetic aperture radar (SAR) imagery. To derive the ice movement of the whole glacier surface with a high accuracy, an integrated approach combining differential interferometric SAR (D-InSAR), multi-aperture interferometry (MAI), and a pixel-tracking (PT) method is proposed, which could fully exploit the phase and intensity information recorded by the SAR sensor. The Chongce Glacier surface flow field is estimated with the proposed integrated approach. Compared with the traditional SAR-based methods, the proposed approach can determine the ice motion over a widely varying range of ice velocities with a relatively high accuracy. Its capability is proved by the detailed ice displacement pattern with the average accuracy of 0.2 m covering the entire Chongce Glacier surface, which shows a maximum ice movement of 4.9 m over 46 days. Furthermore, it is shown that the ice is in a quiescent state in the downstream part of the glacier. Therefore, the integrated approach presented in this paper could present us with a novel way to comprehensively and accurately understand glacier dynamics by overcoming the incoherence phenomenon, and has great potential for glaciology study.

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Section: Intensity-based Method: Ptmentioning

confidence: 99%