Using ArcGis 3D Analyst in Identifying Shortest Network Pathway of WaterSupply through PipelineAuthors:Md. Saliur RahmanAndAsmaul Husna ShaplaUrban and Rural Planning Discipline, Khulna UniversityKhulnaAbstract:ArcGIS 3D Analyst provides advanced visualization, analysis, and surface generation tools.Using ArcGIS 3D Analyst, we can view large sets of data in three dimensions from multipleviewpoints, query a surface, and create a realistic perspective image that drapes raster and vectordata over a surface (www.esri.com). In planning sector using of ArcGIS 3D Analyst isinevitable. The planning professionals use this extension in many prominent areas viz., transportmodeling, designing drainage network, detecting land uses, identifying flood prone areas, 3Dgaming, identifying the arsenic contaminated aquifers, showing rapid urbanization growth,designing water supply network etc. In this report an attempt has been taken to incorporate theArcGIS 3D Analyst extension in identifying shortest network path of water supply throughpipeline.Keywords: 3D Analyst, Visualization, Drape.
Introduction:ArcGIS 3D Analyst provides an extensive set of features to create 3D scenarios using theexisting data, visualize 2D GIS data inside a 3D view to enhance understanding of spatialrelationships between objects within an environment, manage geospatial data in 3D by editingfeatures and adding 3D components to 2D data using new, robust geoprocessing tools, analyzegeospatial data in three dimensions to address problems that simply cant be solved in 2D, create3D views, animations, and analysis to drive decision making (www.esri.com).To identify a shortest network path of water supply through pipeline the following steps shouldbe considered- sourcing of underground water, terrain favorability, indicating the road networkfor access, identifying the existing water supply sources like tube-wells, consider the buildings’height to estimate the vertical extension of the pipeline and finally find out the shortest pipelinepath considering the proximity of water sources, along with roads and excluding the overundulated surface and existing water supply sources.
Working Steps:Draping an image over a terrain surface:Viewing a remotely sensed image draped over a terrain surface can often lead to greaterunderstanding of the patterns in the image and how they relate to the shape of the earth’s surface.There should have collected a TIN that shows the terrain and a satellite radar image that showsthe roughness of the land surface (ESRI, 2000 – 2008). By draping the image over the terrainsurface a dimension can be added to the understanding.Image > Properties > Base Heights > Obtain heights for layer from surfaceDrape the road network in the base height of surface by the previous process.Extrude inversely the column of height data of underground water level:Including z values the height of water level may indicating by point features. These pointfeatures should be converted in 3D.3D Analyst > Convert > Features to 3DThese 3D features should be draped on the base height of surface. Then the 3D features have toextrude inversely to their z values by which the short distanced water level surface from theground surface will be identifiable.3d Features > Properties > ExtrusionIdentify the existing water supply sources through realistic 3D view:Firstly the feature data of existing water supply sources has to add in Arcglob, and thensymbolize the features by 3D objects from 3D styleFeatures > Properties > Symbology > Categories > Unique Values > Value Field > Mode > AddAll Values > More Symbols > Chose the Preferred Symbol with size, angel, rotation etc.The areas where the water supply sources are abundant ought to exclude in the shortest path.Extrude the Polygon Features into Buildings:Now the polygon features have to extrude to represent the buildings with height to determine thevertical extension of the water supply pipes.Polygon Features > Properties > Globe Extrusion > Extrude Features in Layer > Calculate
Conclusion:Planners are confronted with distance the problem of deprived zone from piped water supply andidentification of the optimum path with least cost and distance to meet the present and futurepublic demand. ArcGis 3D Analyst extension tool is surely good enough to design a suitableshortest network path of water supply through pipeline. But due to limited knowledge in 3Danalyst we have explored only some partial working steps to determine the shortest path buthopefully its effective in some extent.Bibliography: • ESRI, Environmental System Research Institute, 2011, htpp://www.esri.com. • ESRI, Environmental System Research Institute, 2000-2008, ArcGis 9; Using ArcGis 3D Analyst, Redlands, USA.