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Geocoding This is a very big issue for municipalities, 911 and business. An overview, once again. N Even City Center Odd Addressing typically follows common patterns in U.S. Addressing can follow theoretical standards Oak St. 299 200 198 100 298 201 199 101 Addresses are matched according to the theoretical standards Oak St. 299 200 198 100 298 201 199 101 For example: 221 Oak St. can be placed approximately ¼ of the length of the block. In reality, most streets do not have theoretical address ranges. Oak St. 234 200 117 100 235 201 119 101 It depends on the age of the neighborhood, size of lots, etc. Most street files have theoretical ranges, but some municipalities use actual ranges. Oak St. 234 200 117 100 235 201 119 101 So the example 221 Oak St. is placed in its actual location, near the end of the block. Remember, street layers are shapefiles or geodatabases and therefore have “geography” – they have coordinates. Therefore, when you match an address, the address now has geography. How 911 works: • A landline (not a cell phone) is attached to an address • An address can be matched to an address ranged street file • When the operator receives a call, the phone number accesses a database with and address that is then matched to a street file. Call to 911 911 Operator Citizen connects to database with citizen’s phone number Phone number is tied to address – 221 Oak St. An example of a real street layer: There can be more than one address in a given street layer There are many addressing options for street layers. The street layer for Denton County 911 You must become familiar with the layer attribute table There are 3 road name fields in the Denton County 911 layer. Editing road line features for use in address ranged purposes. If you do not create intersections while editing the street file, you only have 4 features and 4 records in the above graphic. You cannot assign address ranges to the above file. When creating lines, you must put in nodes at intersections of where lines break into segments.
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