A5039497967- Synthetic Aperture Radar (SAR) Applications and Techniques
- Cryospheric studies and observations
- Landslides and related hazards
- Arctic and Antarctic ice dynamics
- Soil Moisture and Remote Sensing
- Remote Sensing and LiDAR Applications
- Ionosphere and magnetosphere dynamics
- Video Surveillance and Tracking Methods
- GNSS positioning and interference
- Climate variability and models
- Land Use and Ecosystem Services
- Remote Sensing in Agriculture
- Remote-Sensing Image Classification
- Urban Heat Island Mitigation
- Rock Mechanics and Modeling
- Geophysics and Gravity Measurements
- Meteorological Phenomena and Simulations
- Geophysical Methods and Applications
- Advanced SAR Imaging Techniques
Kunming University of Science and Technology
2022-2024
Guilin University of Electronic Technology
2024
Southwest Forestry University
2020
Interferometric Synthetic Aperture Radar (InSAR) is capable of detecting crust deformation. However, the accuracy limited by spatiotemporal changes in lower troposphere. In this paper, we constructed a periodic zenith total delay negative exponential function (PZTD-NEF) model atmospheric variation characteristics based on ERA-5 data to alleviate temporal oscillation bias introduced tropospheric and improve time series InSAR (TS-InSAR) inversion surface We evaluated model's performance using...
We employed ascending and descending Sentinel-1A, optical image data, field investigation methods to identify monitor landslides in the Jinsha River Basin overcome difficulties associated with use of a single method its inaccuracies identifying alpine canyon areas. Using distributed scatterer-synthetic aperture radar interferometry (DS-InSAR), Sentinel-1A data were integrated obtain surface deformation information within study area from July 2017 May 2019. Thereafter, high-resolution...
The influence of solar altitude and azimuth angles makes shadows prevalent in remote sensing images rugged terrains. Consequently, the Normalized Difference Vegetation Index (NDVI) shadow areas is much lower than that sunlit areas—a phenomenon known as NDVI topographic effect. In this study, we developed an effect correction (NTSEC) model. NTSEC based on difference radiation between areas, introduces a variable factor indicates intensity to simulate reflectance for direct light not received...
Tropospheric delay error must be reduced during interferometric synthetic aperture radar (InSAR) measurement. Depending on different geographical environments, an appropriate correction method should selected to improve the accuracy of InSAR deformation monitoring. In this study, surface monitoring was conducted in a high mountain gorge region Yunnan Province, China, using Sentinel-1A images ascending and descending tracks. The tropospheric interferogram corrected Linear, Generic Atmospheric...
<title>Abstract</title> Zenith tropospheric delay (ZTD) play an important role in the troposphere. This study proposed a new ZTD vertical profile grid model considering height scale factor (NGZTD-H) based on Gaussian function that adjusts from starting to target height. To estimate directly, NGZTD considers delicate diurnal variation was developed. The effectiveness of and spatial interpolation for NGZTD-H validated. Regarding interpolation, root mean squared error (RMSE) improved by 58%...
The tropospheric delay caused by the temporal and spatial variation of meteorological parameters is main error source in interferometric synthetic aperture radar (InSAR) applications for geodesy. To minimize impact errors, it necessary to select appropriate correction method different regions. In this study, interferogram results InSAR, corrected using Linear, Generic Atmospheric Correction Online Service InSAR (GACOS) ERA-5 atmospheric reanalysis dataset (ERA5) methods, are presented study...
Forest structure plays an important role in forest biomass inversion using synthetic aperture radar (SAR) backscatter. Synthetic sensors with long-wavelength have the potentiality to provide reliable and timely for their ability of deep penetration into forest. L-band SAR backscatter shows useful above-ground (AGB) estimation. However, way that mediating biomass-backscatter affects improvement related estimation accuracy. In this paper, we investigated sensitivity forests different mean...
Kunming city is located in the middle of Yunnan Province. Due to large-scale groundwater exploitation and urban development recent years, this area has been affected by surface subsidence. In paper, Interferometric Synthetic Aperture Radar (InSAR) Global Navigation Satellite System (GNSS) data are used monitor subsidence for better analysis understanding. The study Sentinel-1A from 2018 2020 with atmospheric correction based on GACOS calculate average annual rate area, results show that...
Improving the accuracy of zenith tropospheric delay (ZTD) models is an important task. However, existing ZTD still have limitations, such as a lack appropriate vertical adjustment function and being unsuitable for China, which has complex climate great undulating terrain. A new approach that considers time-varying delicate diurnal variations was introduced to develop grid model (NGZTD). The NGZTD employed Gaussian considered seasonal coefficients express ZTD. effectiveness interpolation...
The detection of potential rural mountain landslide displacements using time-series interferometric Synthetic Aperture Radar has been challenged by both atmospheric phase screens and decoherence noise. In this study, we propose the use a combined distributed scatterer (DS) Prophet_ZTD-NEF model to rapidly map surface in Diqing Tibetan Autonomous Prefecture, China. We conducted tests on 28 full-resolution SENTINEL-1A images validate effectiveness our methods. conclusions are as follows: (1)...
With the continuous acceleration of urbanization, construction land around Dianchi Lake has been expanded, which may result in serious surface deformation and produce adverse environmental impacts. To explore influence city expansion on ground subsidence Kunming, this paper, we used SBAS-InSAR technique to invert time series velocity Kunming by sentinel-1A datasets acquired from October 2018 2019. The results showed that an average up to-30mm/year at north bank Lake. velocities extracted...
Time-series interferometric synthetic aperture radar (TS-InSAR) is often affected by tropospheric artifacts caused temporal and spatial variability in the atmospheric refractive index. Conventional filtering cannot effectively distinguish topography-related stratified delays, leading to biased estimates of deformation phases. Here, we propose a TS-InSAR delay correction method based on ERA-5; robustness accuracy ERA-5 data under influence different delays were explored. Notably, (1) wet was...
Shadow indexes can effectively and easily detect shadows in remote sensing images. Although various shadow are used, there is no consensus regarding the optimal one. The evaluation criteria used to determine performance of relatively homogeneous. A multi-criteria widely necessary analyse application each index different scenarios. eight most common were selected for this study. In addition standard visual inspection accuracy assessment criteria, cosine solar incidence (cosi) was introduced...