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viewed and analyzed simultaneously in a GIS data browser. This conversion of existing GIS <br /> data is known as a coordinate transformation . The Department has the option to outsource <br /> the coordinate transformation or perform all conversion in-house . Based on the scope of the <br /> project, current staffing within the Department and the intricacies of the service, it is <br /> recommended that this conversion be delegated to a qualified consulting firm . Please refer <br /> to Appendix VI : Coordinate Transformations for a list of items that should be considered as <br /> guidelines for the conversion of existing GIS data into a state plane coordinate system . <br /> A second option is to use GPS to capture the true field location of all above ground features <br /> (i .e . hydrants , manholes, lift stations , etc . ) . This would need to be contracted out to a <br /> qualified engineering firm . Utility staff could be used to connect the points and do <br /> attribution using as-builts . The Utility Department would work with the GIS Director in <br /> developing a data model that would be in the best interest of the Utility Department . <br /> IIS Utility Geodatabase Geometric Networks for Water and Sanity Sewer Utilities <br /> ESRI , in conjunction with many public and private utility organizations, has developed data <br /> models for water and sanitary sewer distribution networks . These data models are designed <br /> to create a logical template for the creation of water and sanitary sewer ArcGIS <br /> geodataboses . The advantages of utilizing these data models include : <br /> Utility business logic : rules for how utilities can and do interact <br /> ,. • Standardized template of utility features, feature attributes , and relationships ( fully <br /> customizable , however) <br /> • Utility specific symbology <br /> Network tracing tools - ability to conduct tasks on each network, including : trace <br /> upstream , trace downstream , find connected features , and more <br /> The following figure is a schematic of the full ArcGIS Water Distribution Data Model : <br /> ArcGIS Water Distribution Data Model <br /> 141 <br /> GIS Needs Assessment and Implementation Plan Chapter 1 - Departmental GIS Needs Assessment <br />