A5065760347- Hydrology and Watershed Management Studies
- Flood Risk Assessment and Management
- Groundwater and Watershed Analysis
- Geophysical Methods and Applications
- Landslides and related hazards
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Remote Sensing and LiDAR Applications
Universidade Federal de Pernambuco
2021-2022
In this work, we aim to evaluate the feasibility and operational limitations of using Sentinel-1 synthetic aperture radar (SAR) data monitor water levels in Poço da Cruz reservoir from September 2016–September 2020, semi-arid region northeast Brazil. To segment water/non-water features, SAR backscattering thresholding was carried out via graphical interpretation backscatter coefficient histograms. addition, surrounding environmental effects on polarization thresholds were investigated by...
Although the single threshold is still considered a suitable and easy-to-do technique to extract water features in spatiotemporal analysis, it leads unavoidable errors. This paper uses an enumerative search optimize thresholds over satellite-derived modified normalized difference index (MNDWI). We employed cross-validation approach treated accuracy as random variable order to: (a) investigate uncertainty related its application; (b) estimate non-optimistic errors involving thresholding; (c)...
The article addresses anthropogenic and geological conditions related to the development of soil subsidence in western zone Recife (Brazil). Over past 50 years, human activity has intensified areas previously affected by soft soils (clay, silt, sandstone) resulting due additional loads (landfills constructions). duration settlement process can be significantly influenced specific characteristics composition location. This work presents, for first time, accurate InSAR time series maps that...