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The application of multi-temporal, multiple-satellite, C- and L-band SAR data for the analysis of backscattering variations, InSAR-derived water-level changes over swamp forests, and subsidence over Southeastern Louisiana

Ohig Kwoun(1) and Zhong Lu(2)

(1) SAIC, USGS EROS Center, Sioux Falls, SD 57198, United States
(2) US Geological Survey, EROS Center & Cascades Volcano Observatory, Vancouver, WA 98683, United States

Abstract

We use multi-temporal European Remote Sensing Satellite 1 and 2 (ERS-1/2), Environment Satellite (ENVISAT), Canadian RADARSAT-1, and Japanese ALOS Synthetic Aperture Radar (SAR) images for ecological, hydrological, and geological studies over Southeastern Louisiana. First, we investigate the seasonal changes in SAR backscatter and interferometric coherence, and their associations with land covers; temporal variation of radar backscattering signal during leaf-off season shows high correlation with the normalized difference vegetation index. Second, we demonstrate the use of both C-band and L-band SAR images to measure changes in water-level beneath swamp forests composed of moderately dense trees, at a vertical accuracy and spatial resolution that is not possible with the current gauge-based measurements. Third, we apply the conventional InSAR and the Persistent Scatterer InSAR techniques to map land surface subsidence over New Orleans and its surrounding area. The comparison of measured subsidence patterns shows certain discrepancies probably due to atmospheric delays in this humid area. Our study demonstrates the importance of SAR data for understanding this coastal flood zone and the associated ecological, hydrological and geological processes.

 

Workshop presentation

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry