A comparison study on land subsidence monitoring in the Xiaolangdi Reservoir area based on SBAS and DS-SBAS

doi:10.13474/j.cnki.11-2246.2026.0203

Abstract

Abstract: Xiaolangdi Reservoir is the core of water and sediment regulation in the Yellow River.The subsidence monitoring of the reservoir is crucial to ensuring its long-term and effective operation.To accurately obtain the settlement information of Xiaolangdi Reservoir,conventional SBAS (small baseline subset)technology and DS-SBAS (distributed scatterer small baseline subset)technology are respectively used for time-series interferometric processing of 60 Sentinel-1A satellite images from 2018 to 2024,and their results are compared.The results show that the correlation coefficient of settlement rates at monitoring points with the same longitude and latitude obtained by SBAS and DS-SBAS is 0.96,indicating a high consistency between the two monitoring results.The number of high-coherence points extracted by DS-SBAS is approximately 54% higher than that by SBAS,and its monitoring effect is more significant in the settlement rate range of 0～5 mm/a.Therefore,DS-SBAS can be used as an effective method for settlement monitoring in the reservoir area.

Key words: SBAS, DS-SBAS, SBAS-InSAR, land settlement, Xiaolangdi Reservoir

CLC Number:

P237

LI Penghao, LI Aiguo, ZHANG Shiyu. A comparison study on land subsidence monitoring in the Xiaolangdi Reservoir area based on SBAS and DS-SBAS[J]. Bulletin of Surveying and Mapping, 2026, 0(2): 12-17.

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