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( e .g . , nightly) . The " distributed access " model will require robust network connectivity and a <br /> means for various users to access the data (e .g . , Intranet GIS data browser) . The centralized <br /> access model can be used by any application that has network access to the enterprise <br /> database; the distributed access model requires applications network access to several <br /> databases as well as functionality that allows access to various data sources at once . <br /> " Distributed Access " Model "Centralized Access" Model <br /> Dab nom Deserlmenpl DaaGrea <br /> Is E,&acW and copped m <br /> cenYall al Enterprises DaUWse <br /> countyGIS usersAaaene "EntersOae. <br /> Deparna lGIs Dam drectly <br /> , . _mk ...v 4 y,•, v SrJ <br /> j Mpo ental <br /> oaaea..a <br /> U.c.. noP«y <br /> Ppalwra OMce) <br /> D,wnme,ml Eue ,aged <br /> iDam m cm.anuanee as <br /> _j connry as oxen cmadlaabE Pan m Centralized <br /> En <br /> l £a Man deal GIs <br /> Enterprise DaUDasse <br /> Dam through ODatabase cwn* GIs Users ACCel All <br /> C,madficsn GIs Dam wg One Database <br /> F ,Dasa, Connector, <br /> GIS Usevs 4 infigh s eea a <br /> Data Lom External Databases Is <br /> PonWlvllr ImryRd In <br /> Centralized! Entities, <br /> �mbase <br /> cwnly GIs Users Mar Aocess External GIs <br /> t <br /> Dam Deeeer nnlaaal t <br /> • - -- -- - F#xnal <br /> "a DaFabmea <br /> o "a Ann... 11 waaae tea 'lol� saterr—.....:' <br /> Figure 5- l : Database Access Options for Indian River County <br /> Based on the County ' s existing network infrastructure and configuration , it is recommended <br /> that in the short term a centralized data access model should be implemented—however, <br /> as the County ' s GIS implementation progresses , it is recommended that the County develop <br /> the proper and necessary network infrastructure and configuration to establish a distributed <br /> data access model . <br /> Regardless of which model the County implements, a logical database design effort will be <br /> needed in order to properly implement a centralized enterprise GIS database . Subsequent <br /> logical database revisions may be needed as GIS data needs evolve and /or as the County <br /> modifies its GIS database model . <br /> ItLogical Database Design <br /> Why conduct a logical database design2 <br /> The logical database design process can be time consuming and produces no end -use <br /> applications . Therefore , the logical design process often receives limited attention , if any. <br /> However, there may be risks associated with not conducting a logical database design . By <br /> not going through the logical design process , Indian River County risks having a poorly <br /> y constructed database that does not meet present or future requirements . Poor database <br /> design can result in duplicate , missing, or unnecessary data ; inappropriate representation of <br /> data ; or lack of proper data management techniques . <br /> v 5-2 <br /> GIS Needs Assessment and Implementation Plan Chapter 5 - Database Design and Setup <br />