Geohazard Evaluation of Bukit Merah/ Malaysia using Geospatial Information Technique
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Geospatial technology (that includes Remote Sensing and Geographical Information System GIS) has opened up opportunities for qualitative analyses of sinkholes distribution with multi thematic maps to define the relationship of GIS database. Kinta Valley have been deteriorating dramatically as a result of changes that had occurred in the past and continues due to the close relationship between the fast rate of lateral urbanization and extensive dimensional expansion of surface mining and quarrying activities, where sinkholes are the main crux of the geohazard in Kinta Valley. Geospatial information system for sinkholes had been established using pictorial, tabular and ancillary data to build a relational GIS database. The application is capable of analyzing an entire data set of sinkholes to create sinkholes distribution map. The objective of this paper is to highlight the value of Geospatial Information System as a tool to define sinkhole distribution and change detection for geohazard evaluation. Keywords: Geospatial, Karst, Sinkholes distribution, Geohazard, Malaysia .Keywords:
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The karst collapse is one of the six major geological disasters in China, the karst region is also the main geological disasters, to the integration of subsidence data management and evaluation is particularly important. In this paper, Lai bin, Jili of Guangxi province is taken as an example, combining RS and GIS technology for thematic information extraction and data management, extracted from remote sensing image subsided land use types; Use of GIS software ArcGIS for platform, combining with subsidence history text, drawings, and on-the-spot field to get the data, established the perfect combination of spatial database, graphic data of subsidence geological environment evaluation and spatial analysis provides a scientific and effective management; The last, The use of GIS space analysis function to completed accurate sensitivity assessment collapse rapid.
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This study presents the development of an Integrated Geographical Information System (GIS), Geophysical Method and Global Positioning Systems (GPS) survey for sinkhole risk modeling in selected residential area. The sinkhole phenomena in residential area have been known to be related to geological factor, environmental and local activities. To determine the subsurface structure and also the location of sinkholes of the study area, the geophysical survey which is resistivity survey was carried out by using ABEM SAS 4000. From the resistivity survey, the area that was identified to have sinkhole was tagged using GPS coordinates through GPS survey using GPS Topcon HiPER. The above data were integrated as a GIS database. Spatial Analysis were carried out using the User Interface developed in this study from the components of ArcGIS Software which are ArcMap and ArcObjects in order to model the sinkhole occurrence risk for the selected residential area. The user interface developed in this study would be useful for those involved in planning and development of housing area and also the other land use activities so that the adverse effect of sinkhole collapse to them could be avoided.
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Abstract. Assessment of geological hazards in urban areas must integrate geospatial and temporal data, such as complex geology, highly irregular ground surface, fluctuations in pore-water pressure, surface displacements and environmental factors. Site investigation for geological hazard studies frequently produces surface maps, geological information from borehole data, laboratory test results and monitoring data. Specialized web-based GIS tools were created to facilitate geospatial analyses of displacement data from inclinometers and pore pressure data from piezometers as well as geological information from boreholes and surface mapping. A variety of visual aids in terms of graphs or charts can be created in the web page on the fly, e.g. displacement vector, time displacement and summaries of geotechnical testing results. High-resolution satellite or aerial images and LiDAR data can also be effectively managed, facilitating fast and preliminary hazard assessment. A preliminary geohazard assessment using the web based tools was carried out for the Town of Peace River.
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In order to popularize the application of the GIS technique in the present geohazard investigation and assessments, the ArcGIS is used to achieve rapid, urgent map making in the subjectTechnical Research in Geohazard Risk Assessmentsof the Science and Technology Support Plan of the eleventh Five-Year Plan and the assessments of the bearing capacity of resource and environment for post-hazard reconstruction program in worst-hit areas of the Wenchuan earthquake.The basic types of landslide risk maps include the landslide documentation map, landslide vulnerability zoning map, landslide danger zoning map and landslide risk zoning map.Based on a description of these map types, the focus is put on the method of modeling by using the ArcGIS software and its space data in order to achieve basic information acquisition and processing in the landslide risk map making and use the spatial data modeling tool to carry out rapid landslide map making.
Geohazard
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