Signatures of ERS–Envisat Interferometric SAR Coherence and Phase of Short Vegetation: An Analysis in the Case of Maize Fields
作者： M. Santoro , U. Wegmuller , J.I.H. Askne
DOI: 10.1109/TGRS.2009.2034257
关键词:
摘要: Interferometric observations between the European Remote Sensing, ERS-2, synthetic aperture radar (SAR) and Envisat Advanced SAR (ASAR) are unique since they characterized by a short repeat-pass interval (28 min) perpendicular baseline of approximately 2 km. In vegetated areas, this configuration should preserve from strong temporal decorrelation enhance sensitivity coherence interferometric (InSAR) phase to volumes with small heights. This assumption could be tested data acquired during dedicated ERS-Envisat Tandem mission on October 15, 2007, over Seeland region, Switzerland. Five maize fields one sunflower field presented lower offsets phase, i.e. height, respect neighboring bare fields. To gain understanding signatures, water cloud model was used simulate InSAR height for Both present clear dependence upon vegetation exhibit consistency. Simulations showed that modeled most sensitive two-way attenuation vegetation. The best correspondence observed parameters obtained values 4 dB/m (corresponding an extinction 1 dB/m) high (above 0.6), being due very stable conditions weather 28-min image acquisitions.
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