قائمة المحتوياتIntroductionResearches:- Geographical Analysis of the Impacts of Shoreline Changes Using Remote Sensing and GIS Techniques. Case Study: Rosetta Nile Branch Promontory, Egypt. Mahmoud. A. Hassaan.- A Robust Model for Measuring and Extracting Ocean Surface Current Patterns from RADARSAT-1 SAR Images. Mohamed A. Maiy...
قائمة المحتوياتIntroductionResearches:- Geographical Analysis of the Impacts of Shoreline Changes Using Remote Sensing and GIS Techniques. Case Study: Rosetta Nile Branch Promontory, Egypt. Mahmoud. A. Hassaan.- A Robust Model for Measuring and Extracting Ocean Surface Current Patterns from RADARSAT-1 SAR Images. Mohamed A. Maiyas, Shattri Mansor, Helmi Zulhaidi bin Mohd Shafri.- Vegetation Change in Arid Environments: An Applied Study of Using Remote Sensing Digital Data in Tabuk area, Saudi Arabia. Khalid M. Al-Rehali Al-Harbi.- Use of GIS and Remote Sensing to Identify Flood Vulnerable Areas: a Case Study from Northern Riyadh. Dr. Eyad H. Fadda.Writings from the World:- The UK as hub of global geodemographics. Dr Martin Bradbury.- Geographic IT for emergency management and event security, All about Metadata. Chris Holcroft .Book Review:- Spatial Data Analysis An Introduction for GIS users.Reports:- International Conference Geotunis.Innovations.Abstracts:Geographical Analysis of the Impacts of Shoreline Changes Using Remote Sensing and GIS Techniques. Case Study: Rosetta Nile Branch Promontory, EgyptMahmoud. A. Hassaan*Abstract:Rosetta Nile branch promontory; the western headland of the Nile Delta retreated dramatically during the last century. Such a retreatment was accelerated since 1960s after the construction of the High Dam, which reduced the sediment load discharged at the Nile promontory. Moreover, these dramatic changes of the shoreline had a number of significant adverse impacts, which need to be assessed and analyzed. Such an assessment and analysis may assist decision and policy makers in mitigating the adverse impacts of shoreline changes.The main objective of this paper is to assess and analyze various impacts of shoreline changes in the vicinity of Rosetta Nile branch promontory during the period from 1972 to 2005 through remote sensing and GIS techniques.For that purpose, the paper applied two different methodologies in order to delineate shoreline from MSS, TM and ETM+ images for the study area in 1972, 1984, 1990 and 2005. For MSS image of 1972, the band ratio of [(Band3 + Band4) / Band1] was applied. Meanwhile, for TM images of 1984 and 1990 as well as ETM+ image of 2005 a combination of histogram threshold of band 5 and two band ratios (band 2/band 5 and band 2/Band 4) was employed. Moreover, a geodatabase for the study area was developed to map and quantify shoreline changes. Also, the developed geodatabase was employed to analyze these changes spatially and assess their impactsThe study found that the maximum retreatment of the shoreline in Rosetta Nile branch promontory was about 3010 meter between 1972 and 2005 with an average retreatment rate of 91.21 m/year. Such dramatic changes of shoreline during the period 1972 – 2005 had a significant impact on the territory, infrastructure and land use pattern of the study area. For example, the study area has lost about 11.6 km2 of its territory during the period between 1972– 2005. Also, about 7.6 km of roads were lost. Moreover, retreating shoreline contributed to the development of wetlands, which in turn, affected land use pattern in the study area. Keywords: Rosetta, band ratio, histogram threshold, shoreline changes.* Associate Professor, Geography Department, Faculty of Arts, University of Damanhour [email protected]. A Robust Model for Measuring and Extracting Ocean Surface Current Patterns from RADARSAT-1 SAR ImagesMohamed A. Maiyas*Shattri Mansor, Helmi Zulhaidi bin Mohd Shafri*Abstract:A robust model was developed based on Doppler frequency shift that utilizes RADARSAT-1 SAR imageries to measure the sea surface current patterns (velocity and direction). The model applied to three different RADARSAT-1 SAR images (Wide-3, HighExtended-6, and Standard-2) which acquired during the period 20-31 March 2005 in the east coast of Peninsula Malaysia. In situ measurement performed using AWAC equipment to validate the result of the study. The area was divided into four main parts comprising the onshore, fieldwork area, mid-shore, and offshore. The study found a strong relation between the image backscatter, incident angle and Doppler frequency shift. The image processing of the spectral intensity of the SAR data in different modes displayed variation among the four areas. Statistical analysis was used to establish the coefficient of determination between the velocities extracted from SAR data and the real ocean current measurements measured by AWAC during the situ measurements. The present study provides an investigation between different radar modes which can be used as a tool for further research to investigate water current movement.Keywords: RADARSAT-1; Doppler frequency shift; robust model; sea surface current(*) Head of Geography Department, Faculty of Arts, Sana’a University, P. O. Box: 11412, Sana’a, Yemen, E-mail: [email protected].(**) Department of Civil Engineering, Faculty of Engineering, University Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia. E-mails:{shattri, helmi}@eng.upm.edu.my Vegetation Change in Arid Environments: An Applied Study of Using Remote Sensing Digital Data in Tabuk area, Saudi ArabiaDr. Khalid M. Al-Rehali Al-HarbiAbstract:This paper discusses the application of remote sensing digital data for detecting vegetation change in Tabuk area, Saudi Arabia. It focuses on utilizing infrared color composite technique to display vegetation sites and using spectral reflectance analysis to show the trend of vegetation change over 13-year period of time in the study area.The Ratio Vegetation index (RVI) was intensively examined in this study to determine vegetation differences and showed that the area has experienced a type of deterioration.On the other hand, the increase of rainfall values has directly changed the RVI values due to the increase of vegetation cover in the field sites.The paper demonstrates that RVI equation is a useful technique for detecting and monitoring vegetation change in arid environments, and can be utilized in many geographic studies in Saudi Arabia.Key words: Remote sensing – Arid environment – RVI- Tabuk Area - Desertification* Associate Professor of Geography, Department of Social Studies, Makkah Teachers College P.O.Box 8107 , Email: [email protected] Use of GIS and Remote Sensing to Identify Flood Vulnerable Areas: a Case Study from Northern Riyadh.Dr. Eyad H. Fadda*Abstract:Many areas in the city of Riyadh are subject to heavy rainfall, which leads sometimes to a rise in water level on roads and result in traffic disturbance as happened in 1995 and 2010. It's well known that floods are unpreventable, though it is possible to reduce their risks through taking mitigation measures. The most important is to construct a database and to produce analytical maps for sensitive areas, besides that to construct monitoring networks and early alarm systems. This study was carried out in order to locate drainage basins and water courses in areas subjected to flood, especially areas of possible urban growth in north Riyadh. A spatial analysis was conducted for these basins using remote sensing (RS) and geographic information system (GIS) for producing thematic maps. A spatial database was constructed and utilized for topographic and slope analysis using Digital Elevation Model (DEM). Keywords: flood, remote sensing, GIS; Vulnerable, spatial analysis, thematic maps.* (*) Dept. of Geography, Faculty of Art, King Saud University, Al-Riyadh, Saudi Arabia, Email: [email protected]
