Abstract

This paper introduces a new approach for mapping coastal geomorphology by using differential synthetic aperture radar interferometry (DInSAR). Fuzzy B-spline is used to accelerate and improve the accuracy of 3-D map from DInSAR. The DInSAR algorithm involved two parts: 3-D map simulation and interferogram simulation with discrete element method (DEM) and satellite orbit parameters. 3-D coastal geomorphology reconstruction is realised by the fuzzy B-spline algorithm with the midpoint displacement method and the terrain roughness, and average slope are determined by two describing parameters of the model. Furthermore, fuzzy B-spline was used to eliminate topographic phase from the interferograms. Three RADARSAT-1 data sets of fine beam mode (F1) had been obtained between November 1999 and March 2004. The study shows incomplete fringe interferometry pattern because of decorrelation. Furthermore, fuzzy B-spline of DInSAR performs higher overall accuracy of 95% compared to DInSAR technique and ground data. Finally, prefect fringe pattern is clearly produced in ocean water body that refers to ocean water InSAR or liqui-InSAR. In conclusion, fuzzy B-spline of DInSAR provide accurate map of 3-D coastal geomorphology construction from historical RADARSAT-1 SAR fine mode data and can be also tool for liqui-InSAR.

Key words: RADARSAT-1 SAR, differential synthetic aperture radar interferometry (DInSAR), fuzzy B-spline, 3-D, coastal geomorphology.

Abbreviation

ESRIN, European Space Research Institute; SNR, signal-to-noise ratio; TPDI, three passes differential interferometry; DInSAR, differential synthetic aperture radar; SAR, synthetic aperture radar.