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Modeling sprawl of unauthorized development using geospatial technology: case study in Kuantan district, Malaysia

International Journal of Digital Earth 2011年第3期4卷 223-238页

作者： mazlan hashim Norzailawati Mohd Noor Maged Marghany Institute of Geospatial Science&Technology(INSTEG) Faculty of Geoinformation Sciences and EngineeringUniversiti Teknologi Malaysia81300 UTM SkudaiJohor BahruMalaysia

The paper explores a framework combining remote sensing and GIS-cellular automata(CA)concepts aimed at improving the modeling of unauthorized land use *** sensing data have been used in urban modeling and analysis,the use of high-resolution remote sensing data in assessing unauthorized development is quite *** work has demonstrated systematic combination utilization of geospatial analyses tools to acquire a new level of information to enable urban modeling and sprawl analysis in assisting urban sustainable *** this study,Kuantan city,Malaysia was selected in simulation of the unauthorized land use with CA concept for a period of 15 years(20002015),with main input time-series land use observation from 1995 to *** 2000 and 2005 land use input was also used as calibrated and test assessment of the *** results show excellent agreement between in-situ changes of the unauthorized land use classes and the corresponding simulated classes within the same *** conclusion,CA model can lead to new levels of understanding of how urban areas grow and change as in view of digital earth aspiration.

关键词： cellular automata sprawl remote sensing GIS urban simulation

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3-D visualizations of coastal bathymetry by utilization of airborne TOPSAR polarized data

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International Journal of Digital Earth 2010年第2期3卷 187-206页

作者： Maged Marghany Arthur P.Cracknell mazlan hashim Institute for Science and Technology Geospatial(INSTEG) Faculty of Geoinformation Science and EngineeringUniversiti Teknologi Malaysia81310 UTMSkudaiJohore BahruMalaysia

Multi-frequency C and L bands in the TOPSAR data have been utilized to reconstruct three-dimensional(3-D)bathymetry *** main objective of this study is to utilize fuzzy arithmetic to reduce the errors arising from speckle in synthetic aperture radar(SAR)data when constructing ocean bathymetry from polarized SAR *** doing so,two 3-D surface models,the Volterra algorithm and a fuzzy B-spline(FBS)algorithm,which construct a global topological structure between the data points,were used to support an approximation to the real *** algorithm was used to express the non-linearity of TOPSAR data intensity gradient based on the action balance equation(ABC).In this context,a first-order kernel of Volterra algorithm was used to express ABC *** inverse of Volterra algorithm then performed to simulate 2-D current velocities from CVV and LHH ***,the 2-D continuity equation then used to estimate the water *** order to reconstruct 3-D bathymetry pattern,the FBS has been performed to water depth information which was estimated from 2-D continuity *** best reconstruction of coastal bathymetry of the test site in Kuala Terengganu,Malaysia,was obtained with polarized L and C bands SAR acquired with HH and VV polarizations,*** 10 m spatial resolution of TOPSAR data,bias of0.004 m,the standard error mean of 0.023 m,r2 value of 0.95,and 90%confidence intervals in depth determination was obtained with LHH band.

关键词： TOPSAR polarized data Volterra algorithm fuzzy B-spline algorithm bathymetry

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3-D reconstruction of coastal bathymetry from AIRSAR/POLSAR data

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Chinese Journal of Oceanology and Limnology 2009年第1期27卷 117-123页

作者： Maged MARGHANY mazlan hashim Arthur P. CRACKNELL Department of Remote Sensing Faculty of Geoinformation Science and Engineering Universiti Teknologi Malaysia 81310UTM Skudai Johore Bahru Malaysia

This paper introduces a new method for reconstructing three-dimensional （3D） coastal bathymetry changes from Airborne AIRSAR/POLSAR synthetic aperture data. The new method is based on integration between fuzzy B-spline and Volterra algorithm. Volterra algorithm is used to simulate the ocean surface current from AIRSAR/POLSAR data. Then, the ocean surface current information used as input for continuity equation to estimate the water depths from AIRSAR/POLSAR data. This study shows that 3D ocean bathymetry can be reconstructed from AIRSAR/POLSAR data with root mean square error of ±0.03 m.

关键词： AIRSAR/POLSAR data Volterra algorithm Fuzzy B-spline 3D bathymetry

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Mesoscale surface circulation and variability of Southern Indian Ocean derived by combining satellite altimetry and drifter observations

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Acta Oceanologica Sinica 2015年第9期34卷 12-22页

作者： BENNY N.Peter SHENBAKAVALLI Ranjan mazlan hashim MOHD Nadzri Reba MOHD Razali Mahmud Department of Coastal and Offshore Engineering School of Ocean Engineering and Underwater TechnologyKerala University of Fisheries and Ocean Studies Department of Geomatic Engineering Faculty of Geoinformation and Real EstateUniversity of Technology Malaysia Institute of Geospatial Science & Technology Faculty of Geoinformation and Real EstateUniversity of Technology Malaysia

High resoultion Eulerian mean velocity field has been derived by combining the satellite tracked surface drifter data with satellite altimetry and ocean surface winds. The drifter data used in this study includes Argos and surface drifter data from Global Drifter Program. Maps of Sea Level Anomaly （MSLA） weekly files with a resolution of （1/3）° in both Latitude and Longitude for the period 1993-2012 have been used. The Ekman current is computed using ocean surface mean wind fields from scatterometers onboard ERS 1/2, Quikscat and ASCAT. The derived mean velocity field exhibits the broad flow of Antarctic Circumpolar Current with speeds up to 0.6 m/s. Anomalous field is quite significant in the western part between 20~ and 40~E and in the eastern part between 80~E and 100~E with velocity anomaly up to 0.3 m/s. The estimated mean flow pattern well agrees with the dynamic topography derived from in-situ observations. Also, the derived velocity field is consistent with the in-situ ADCP current measurements. Eddy kinetic energy illustrates an increasing trend during 1993-2008 and is in phase coherence with the Southern Annular Mode by three month lag. Periodic modulations are found in the eddy kinetic energy due the low frequency Antarctic Circumpolar Wave propagation.

关键词： Antarctic Ocean circulation satellite altimetry eddy kinetic energy Southern Indian Ocean antarctic circumpolar wave

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Toxicity effects of water extracts of Holothuria atra Jaeger in mice

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Asian Pacific Journal of Tropical Biomedicine 2014年第8期4卷 614-617页

作者： Ridzwan Bin hashim Nurul Alia Azizan Zaitunnatakin Zamli Farah Hanis Zulkipli Nurzafirah mazlan Osama Yousef Althunibat Department of Biomedical Science Faculty of Allied Health SciencesInternational Islamic University Malaysia Kuantan CampusJalan Sultan Ahmad ShahBandar Indera Mahkota 1025200 KuantanPahangMalaysia Faculty of Pharmacy Alzaytoonah University of JordanAmmanJordan

Objective:To determine lethal median dose(LD_(50)) and histopalhological toxicity of water extract of Hololhuria atra(H,atra) in ***:The behavioral changes,mortality and histopathology examination on liver were assessed in mice 14 d after the administration(i.p.) of *** water *** doses 110,20,30,50.100.150 and 200 mg/kg) of *** were *** control group was treated with normal saline,Results:In the acute study in mice,the water extracts of H,atra caused dose-dependent general behavior adverse affects and *** main behavioral sign of toxicity was hypoactivity,noticed immediately after administration of the extract which was more obvious at the higher doses and persisted until *** increased with increasing doses,the calculated LD_(50)was 41 mg/kg in *** liver toxicity was confirmed by histopalhological examination,which indicated the presence of abnormal hepatocytes with a distorted shape and undefined cell lining as well as enlarged nuclei in low doses *** doses groups indicated a more prominent distortion of the polyhedral hepatocytes with undefined cell lining,massive cytoplasm,*** and karyolytie nuclei(necrosis of hepatocytes).Control group showed polyhedral hepatocytes with defined cell lining arranged in cords and normal round nuclei,with granular ***:Because of the relatively low LD_(50) value in the acute study in mice,it may be concluded that the *** water extract is toxic.

关键词： Holothuria atra Water extract Lethal median dose Animal toxicity

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