Geocoding

1
Geocoding

• This is a very big issue for municipalities, 911
  and business.

2
An overview, once again.
N
Even
City Center
Odd
Addressing typically follows common patterns in
U.S.
3
Addressing can follow theoretical standards
4
Addresses are matched according to the
theoretical standards
5
In reality, most streets do not have theoretical
address ranges.
It depends on the age of the neighborhood, size
of lots, etc.
6
Most street files have theoretical ranges, but
some municipalities use actual ranges.
Oak St.
100
117
234
200
101
119
201
235
Cedar St.
Elm St.
So the example 221 Oak St. is placed in its
actual location, near the end of the block.
7
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.
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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.

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Call to 911
911 Operator connects to database with citizens
phone number
Citizen
Phone number is tied to address 221 Oak St.
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An example of a real street layer
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There can be more than one address in a given
street layer
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There are many addressing options for street
layers.
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The street layer for Denton County 911
15
You must become familiar with the layer attribute
table
There are 3 road name fields in the Denton County
911 layer.
16
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.
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When creating lines, you must put in nodes at
intersections of where lines break into segments.