Address Geocoding - PowerPoint PPT Presentation

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Address Geocoding

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Adding an event theme allows you to create a point shapefile from a table of x-y ... to use a field not required be sure and set the attribute field to 'None' ... – PowerPoint PPT presentation

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Title: Address Geocoding


1
Address Geocoding
  • Engineering Applications of GIS
  • Civil and Environmental Engineering
  • CEEn 514

2
Definitions
  • Adding an event theme allows you to create a
    point shapefile from a table of x-y values.
  • Geocoding is the process of converting a set of
    street addresses to x-y values so that like an
    event theme a point shapefile can be created.

3
The Process
  • Make a street (line) theme matchable
  • Match a list of addresses
  • Handling unmatched addresses

4
Making a Theme Matchable
  • Address Style
  • US Streets
  • US Streets with Zones
  • 5 Digit Zip
  • Single Field
  • Others

5
Attribute Fields
  • US Streets
  • LeftFrom
  • LeftTo
  • RightFrom
  • RightTo
  • StreetName
  • Predir/Sufdir
  • StreetType

6
Specifying an Address Style
  • Theme Properties

Required for this type
Attribute Field Names
7
A Matchable Theme
  • If you dont want to use a field not required be
    sure and set the attribute field to None
  • When you select OK in the Theme Properties dialog
    ArcView builds a couple of geocoding index files
  • .ixs
  • .mxs

8
Matching a List of Addresses
  • You need a table file
  • One field must contain addresses

9
Matching Addresses
10
The Score
  • Each component is scored according to how well it
    matches
  • Weight (name is most important)
  • Cotonwood where Cottonwood is expected would
    score less than perfect
  • Weighted scores above 75 are considered acceptable

11
Interactive Rematch
  • Records with less than 60 you can examine and see
    why the score is low
  • You can choose to have a low score match accepted

12
Geocoding Preferences
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