R99-50 AUTHORIZING EXECUTION OF AGREEMENT

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Rpr 14 99 04: 46p Hruce Harris 630 761 -0952 p. 8 , Cadastra! Aerial Tax Ma s Using new aerial photography obtained in the spring of 1998 as a base, new seamless digital property maps wiii be prepared to accurately show each of the approximate 53,000 parcels of real property througiiout Macon County. Map Scales and Format-20"x30" Rural Areas: Sparsely papulated areas containing acreage, metes and bounds parcels, and large lots will be provided at a scale of 1"=400'. Each map will cover two land sections under the Federal Rectangular Survey System. Overall sheet size will be approximately 20" east to west covering approximately one nnile,by approximately 30" north to south covering approximately two miles. Urbanized Areas: Densely to moderately populated areas containing parcels of conventional residential iot size will be provided at a scale of 1"=1 QO'. Each map will cover vne eighth of a section of land under the Federal Rectangular Survey System. Overall she.et size will be appro�cimately 20"east to west covering approximately I/4 mile, by approximately 30"north to south covering approximately 1/2 mile. All cadastral data will be created as a seamless digital map graphic database using USGS control. The primary source for all cadastral data will be the existing Macon County tax maps located in the Supecvisor of Assessments of�ice. BHA will produce a set of work map prints for use in the creation of the cadastral database. Using the new aerial photos in conjunction with the work maps as reference tools, each parcel will be constructed in the cadastral database. The actual production of the cadastral database includes various work phases. Using computer graphics work stations and ESRI's Arc/Info software, section tines, roads, hydrography, and all recorded subdivision line work is entered into the computer using coordinate geometry, digitizing, or scanning, thc line work off the existing Macon County tax maps. After the initial line work has been cc�mputerized, lot number and dimensions are added to the database, along with the apprapriate text. All data will be delivered in coverage's which wiil be in correct topologic format. All attribute(non- graphic) data associated with these coverage's will be stored as datafiles in Info, a relational database management software which is fully integrated with the graphics. Once the linework has been sufficiently captured, some post-processing may need to be done to ensure the accuracy and completeness of the data. Physical features found in the aerial photography such as apparent Gnes of owaers4up, hydrography, and back of sidewalks may be utilized as an additional check of the parcel data for its positional correctness. Any physical features contained in the tax maps will be compared to its carresponding feature in the aerial photography. If there are differences,the tax map wilf be adjusted.