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Several immediate and long -lasting benefits normally derived from parcel base map layer integration include : • A comprehensive inventory and accounting of all taxable land Comparisons of deeded and calculated (actual) acreage • Inventory and determination of County-owned lands and conveyances Verification of tax rolls and incorporation of City annexations, providing checks-and- balances of appraisal entity records Provides a strong foundation for control of future growth , land development, and population forecasting • Fosters closer cooperation with other local governmental entities Among the more tangible and practical benefits emerging from the parcel base map layer: • County mailing lists & affected property owner notifications • Improved public safety response and emergency evacuation ` a Readily available property ownership information Property valuations and County service expansion/prioritization Floodway management & building code enforcement • Creation of County map books and atlases History & Current Status Indian River County maintains a parcel layer in an ArcGIS SDE geodatabase which is updated frequently by the GIS Mapping Coordinator and five GIS Mappers in the Property Appraiser' s Office . They currently use ArcEditor 9 . 1 and the Nova LIS ' Parcel Editor extension to maintain the Indian River County digital tax parcel layer. The parcels were originally derived through digitizing mylars in house using the Manitron System in the late 80 ' s . The entire dataset, comprised of seven distinct sections, had no georeference information attached . In the early 1990s , the parcels were converted over to the ESRI format as coverages . In 2000, the Office gathered the best information it could regarding the section corners to get best fit using the rubbersheeting method . Because the section corners were not highly accurate , the parcel base map lacked considerable accuracy and some areas in the county were off by as much as 10- 100 feet. At present , when the County Surveyor receives digital submissions of new subdivisions , the CAD file is emailed to the Property Appraiser ' s Office and plats are brought in and tied to the existing parcel base; old inaccurate areas are not revisited . Thus, the parcel layer ' s accuracy is improving with time . In 2004, the Department upgraded to an ArcSDE database and converted the parcels into this format using ESRI ' s Parcel Data Model as a guide . Currently, a base map densification project is being looked into by the County ' s Surveyor and Mapper. Once the densification is in place, the parcel layer will gradually become more and more accurate . At present, several County departments, including the Community Development and Public Works departments , utilize parcel map data . The maintenance of duplicate versions of parcel data requires additional time and resources to synchronize parcel data once updates, additions , and revisions are complete . In addition , preliminary evaluation of the spatial accuracy of their parcels indicates that feature geometries need to be corrected and/or updated . 4-2 GIS Needs Assessment and Implementation Plan Chapter 4 - Base Map Creation and Consideration