UniversitiTeknologi Malaysia 81310

Sekudai, Malaysia

UniversitiTeknologi Malaysia 81310

Sekudai, Malaysia
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Marghany M.,UniversitiTeknologi Malaysia 81310
International Journal of Physical Sciences | Year: 2011

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 is 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. © 2011 Academic Journals.


Marghany M.,UniversitiTeknologi Malaysia 81310 | Hashim M.,UniversitiTeknologi Malaysia 81310
International Journal of Physical Sciences | Year: 2010

Synthetic aperture radar (SAR) has been recognized as a powerful tool for geological features detection. This work introduces a new approach for modification of adaptive Lee algorithm to semi-automatically detected geological features from RADARSAT-1 SAR data. This is based on modification of Lee algorithm formula by using 2D Gaussian convolution formula. The result shows that the new formula of Lee algorithm can be delineated lineament features in RADARSAT- 1 SAR data. The new formula based on 2D Gaussian performed better in semi-automatically detected lineament features as compared with Lee algorithm. The modification of Lee algorithm has a small standard deviation of 3.54 as compared to Lee algorithm. ©2010 Academic Journals.


Marghany M.,UniversitiTeknologi Malaysia 81310 | Hashim M.,UniversitiTeknologi Malaysia 81310
International Journal of Physical Sciences | Year: 2010

This study is done to solve the Doppler spectra equation by involving two -dimensional Fourier transform (2DFFT) to obtain a linear formula of sea radial component. The problem of influence of bandwidth on imaging moving ocean surface is analytically solved. Based on the maximum peak of Doppler spectra, the horizontal surface current is computed. The Doppler spectra model has been performed in the RADARSAT-1 SAR data. This study concludes that Doppler spectra model is an appropriate method to compute the sea surface current in the RADARSAT-1 SAR data. © 2010 Academic Journals.


Marghany M.,UniversitiTeknologi Malaysia 81310 | Hashim M.,UniversitiTeknologi Malaysia 81310
International Journal of Physical Sciences | Year: 2010

This study introduced a new approach for coastal erosion and sedimentation monitoring. In doing so, the airbone topographic synthetic aperture radar (TOPSAR) polarized data is used with the conventional techniques of mapping shoreline rate changes, which is based on the estimation of historical vector layers. The main problem for shoreline identification is raised up due to speckles impact. Therefore, the speckle reductions are performed by using an adaptive filter algorithm to identify the coastline edge morphology. In this context, Lee algorithm, combination of linear contrast, Gaussian and histogram equalization enhancement is used. Thus the manual vector layer digitizing is applied to extract the coastline for the different polarized bands. Further, the accuracy assement is determined based on the statistical analysis of T-test. Indeed, T-test is used to determine the significant distinction between the TOPSAR different polarized bands. For more precisely, SPOT satellite data are used with near real time in situ measurements to determine appropriate band for shoreline change estimation. The results show that the Cvv band is performed better than other bands with root mean square error of ± 0.9 m and r2 of 0.73. This confirms with T-test in which there is a major difference between C and L bands. ©2010 Academic Journals.


Marghany M.,UniversitiTeknologi Malaysia 81310 | Sabu Z.,UniversitiTeknologi Malaysia 81310 | Hashim M.,UniversitiTeknologi Malaysia 81310
International Journal of Physical Sciences | Year: 2010

This study presents work to utilize multi synthetic aperture radar (SAR) data to map the rate of spit change along the east coast of Kuala Terengganu, Malaysia. Multi temporal SAR data are involved in ERS-1 and RADARSAT -1 SAR data. Two algorithms have implemented to extract the spit's boundary from multi-SAR data which are Lee and Enhance Lee algorithms. The two algorithms are applied to multi-SAR data with window kernel sizes of 3 × 3, 5 × 5, and 7 × 7, respectively. The rate of spit change is estimated using the traditional method of historical vectors overlaying technique which were acquired from multi-SAR data by manual digitizing. This study shows that Enhance Lee algorithm with kernel window size of 5×5 provides better speckles reduction. It is interesting too to find that the spit has dominated by accretion since 1993 to 2003 which is 7 months/year. It can be concluded that the multi- SAR data can be used for mapping coastal geomorphology change in tropical area such as Malaysia. © 2010 Academic Journals.

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