R99-50 AUTHORIZING EXECUTION OF AGREEMENT

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Rpr 14 99 04: 45p Hruce Harris 630 761 -0952 p. 6 . � • . E-911 Base Mau Conversion Macon County and E-911 wil(receive a digital street centerline file that will be the base for all county departments for use in geocoding data. The database will be designed, created and delivered in ArcInfo, a GIS software licensed by Environmental Systems Research Institute,Inc. (ESR�of Redlands California. All ' data will be provided in correct topological format for the storage o�lines,points, potygons and annotation. A!I attribute data associated with these data sets will be stored in Info, a relational database management software which is fully integrated with the graphics. The coordinate system of the base will be in Illinois State Plane, Ea.st Zone,North American Datum af 1983 {NAll83), measured in feet. An additional coverage may be delivered to Macon County and E-911 in Geographic Reference System, latitude longitude format,NAD83, measured in decimal degrees. After the address attributes have been collected by Macon County's readdressing vendor and attached to the graphics, the data will be run through a build process that will identify any address errors that may consist of overlapping address ranges,"from to"vectorization errors, "left right" side attribute problems. All discrepancies will be forwarded to the E-9l 1 committee and the vendor chosen for readdressing for review and correction. If the county's vendor for readdressing creates a separate centerline file,the data will be conflated ta the new base and items will be transferred to the base. Any discrepancies will be noted and forwarded to the E-9i 1 committee and the vendor for reconciliation. Building Street Centerline File A1l street centerlines will be created in a digital environment based on the newly acquired asrial photography. The aerials will be registered to the USGS or any available GPS control. Using digitizing techniques, the line work will be captured into an ArcInfo coverage. Nodes will be constructed at all intersections to include: street,rail, hydrographic features, bridge overpasses and viaducts. All street segments will be depicted by a single line, except where there is sufi'icient open space between lanes of travel. Examples would be expressways or boulevard type situations. Rail features will be collected as a single line, except for rail yards. Attribution of rail features wil)be dependent upon the cooperation of the rail line owners. Several processes will be applied to the data to insure that a topological structure is inherent to t6e data. The completed centerline file will bc provided to Macon County,E-9l 1 and the readdressing vendor for use of collecting the following attributes. It is suggested that the readdressing vendor use this base to collect and attribute all street segments with the outlined attributes. The automation of existing paper maps wiIl be done through a combination of digitizing and use of the newly created centerline file for creation of the following data sets� p�lice districts boundaries,fire protection district,EMS,ESN, and municipal boundaries.