2006-193A. - Laserfiche WebLink

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Although Emergency Services staff indicated that the street centerline layer is accurate and up-to-date, the street centerline layer should be evaluated and analyzed to determine if all street segments have been added along with valid attribution ; this effort should be conducted using a combination of random testing and field-based " ground truthing . " Additional attributes may be added to the centerlines as applications are developed . For example, both pavement management and transportation improvement maps will require additional attributes . Once verified , GIS applications such as address assignment, crime analysis , and fire incident analysis can be accomplished . The street centerline layer should be made available to all departments/offices and users for general reference , data browsing , and queries . A street centerline layer is necessary for many GIS analysis tasks ; however, it does have some limitations . An address search on a street centerline layer will only locate the interpolated position of that address in relation to the centerline - in the middle of the street or at a designated offset . The interpolated location will not show the actual location of the address . Addresses with multiple units or structures may be ambiguously located , as a point may be used to represent a complex of buildings (e . g . , a shopping center) . Additionally, actual addresses may vary from their interpolated location based on address ranges ; in turn , address ranges may not be correct or may be outdated (see Address Points and Geocoding below) . A solution for preventing and mitigating such discrepancies is to create an address point layer. Local governments increasingly are developing address point layers to yield more accurate address search results . An address point can be placed in the center of each structure in the County, or at the entrance of the primary driveway. Structures with multiple units such as apartment complexes and condominiums can have one address point for each unit . Address Points History and Current Status Indian River County currently has no digital address point layer. An address point layer will provide a greater level of accuracy and detail of the structure locations within Indian River County than an address search based on geocoding from the mile post or street centerline layer. A more accurate address location , provided by a point on the map representing each structure in the County, provides many key benefits including ; routing of emergency vehicles and emergency management and dispatch , address management and maintenance and spatially enabling disparate county databases . Each database maintained in the county that contains address information can use the address layer as a mapping point. Spatially enabling databases allows for more sophisticated and efficient analysis of the information stored in those databases . The address location can provide a common key between each disparate database . y Recommendations It is highly recommended that the County develop a digital address point layer using a hybrid approach drawing from multiple sources including the County ' s MSAG ( Master Street ' Address Guide ) database , other databases throughout the County with address information , the parcel layer and field -based verification . Address information stored within the MSAG 4- 10 GIS Needs Assessment and Implementation Plan Chapter 4 - Base Map Creation and Consideration