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10 foot <br /> offset <br /> 50 foot offsets <br /> Depending on address - matching logic used during geocoding, an <br /> address interpolated near an intersection (or sheet segment end) <br /> will be placed at a different offset. If the specified 50 foot offset <br /> were to be used in this case, the address point would be placed <br /> near the end of the line segment and offset by 50 feet, thereby <br /> placing the point close to the middle of the intersecting street. <br /> Other limitations of geocoding include the interpolation logic used for address matching . <br /> Interpolated addresses are subject to address matching rules, which in some instances may <br /> place a point within a block group centroid , or even within a Zip Code centroid , if address <br /> information is ambiguous and/or incomplete . For example, if a record does not have all <br /> n relevant address information , such as an incomplete street number or a misspelled street <br /> name , that record may be geocoded to a Zip Code centroid . <br /> The following describes the suggested methodology for creating a master address point <br /> layer for the County . <br /> F Phase 1 <br /> Creation of Master Address Database <br /> Two alternatives exist for this phase : <br /> 1 . Indian River County has an MSAG database in the Emergency Services <br /> Department, which is used for E911 purposes . If this database stores specific <br /> information about the address such as house number, street name, street <br /> type, and street direction , then it can be used as a reference for the <br /> geocoding of addresses . <br /> 2. If, however, the MSAG database lacks this information , another database <br /> within the County should be used in conjunction with the existing parcel layer <br /> as a base listing of all the addresses in the County ( e . g . , utility billing <br /> database) . The creation of a master address database will provide a <br /> resource for geocoding addresses and for the field verification phase . Once <br /> all data sources are collected , the geocoding phase can begin . <br /> Geocodina of Addresses <br /> Once the addresses that need to be generated on the map are determined , the <br /> cumulative physical address field in the database can be address matched ( also <br /> known as geocoded ) against the attributed street centerline file . The database and <br /> centerline file should be processed through the ArcGIS 9 Geocoding Service in <br /> ArcCatalog . <br /> 4- 14 <br /> GIS Needs Assessment and Implementation Plan Chapter 4 - Base Map Creation and Consideration <br />