Abstract: [Purposes]To systematically evaluate the operational monitoring potential of LT-1 L-band SAR in the dense vegetated areas of northwest Yunnan.[Methods]This study quantitatively compared the coherence point density,peak coherence,and integrity of typical subsidence zones using SBAS-InSAR deformation inversion based on 16 scenes of LT-1 and 21 scenes of Sentinel-1 data from Lanping county,Yunnan.[Findings]Results indicate: ①LT-1 exhibits significantly superior coherence performance than Sentinel-1 in high-vegetation areas,with a correlation point density of 6685 points per km² and a peak coherence of 0.85,compared to Sentinel-1's 5790 points per km² and 0.25,respectively.②LT-1 demonstrated higher deformation monitoring accuracy,with average RMSE₁ of 1.60 mm and MAE₁ of 1.24 mm,both lower than Sentinel-1's 4.69 mm and 3.47 mm.③LT-1 detected a maximum annual average subsidence rate of 362 mm/a in mining areas,far exceeding Sentinel-1's 65 mm/a,while revealing the coupling between photovoltaic power station subsidence and river flow direction.[Conclusions]Leveraging its L-band penetration capability,LT-1 enables millimeter-level monitoring,providing operational support for mine safety,photovoltaic foundation stability,and geological hazard early warning.

Key words: LT-1, Sentinel-1, time series InSAR, dense vegetation, large-gradient deformation