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Evaluation of ALOS observations for Wetland InSAR applications

Shimon Wdowinski(1), Sang-Hoon Hong(1), Sang-Wan Kim(2), Falk Amelung(1) and Tim Dixon(1)

(1) University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149, United States
(2) Sejong University, 98 Gunja-Dong, Seoul 143-747, Korea

Abstract

Wetland Interferometric Synthetic Aperture Radar (InSAR) is a relatively new application of the InSAR technique, which detects water level changes in aquatic environments with emergent vegetation. It provides high spatial resolution hydrological observations of wetland and floodplains that cannot be obtained by any terrestrial-based method. However, InSAR observations are relative both in space and time and, hence, depend on terrestrial (stage) observations for calibration and validation. Insofar we have used the available JERS-1, ERS-1/2, ENVISAT, RADARSAT-1, and TerraSAR-X SAR data to explore which data type is most suitable for the wetland application, as well as exploring the usage of InSAR for detecting water level changes in various wetland environments around the world. Our analyses indicate that longer wavelength SAR systems (L-band), horizontal (HH) polarization of the radar pulse (both L- and C-bands), and short repeat orbits provide best results. Here we report on the usage of the L-band ALOS data for wetland InSAR application. Preliminary results show that ALOS data maintain phase over the Everglades wetlands (south Florida) even after five months with similar quality to the JERS-1 data. These encouraging results suggest that ALOS data can be very useful for wetland InSAR applications.

 

Symposium presentation

 

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