Address matching

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Address matching

• Very common for
• Crime reports
• Customer records
• Tax/Parcel records
• Most common form of geographic data
• (places are located without coordinates)
• www.gvmc-regis.org/help/esri_manuals/ArcGIS_Deskto
  p/Geocoding_in_ArcGIS.pdf

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Address matching

• Works by describing a location in relation to
  known entities
• State, city, street etc. are all known places
• The numerical address is simply the last
  identifier used to locate a place.

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380 New York St., Redlands, CA, 92373
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The address matching process. The GIS uses a
field by field comparison to generate a match
score. Each field is compared and an overall
score computed to match the address with a
spatial location. The score is normalized to a
100 point value (100 is a perfect match in all
fields)
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The Common US Streets address format
International Addresses? FAO Viale delle Terme
di Caracella 00100 - Rome Italy Or Istasyon
Cad. Bostan Sok. No.6 Yesilkoy 34149 Istanbul/Turk
iye
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Address matching is an interactive process.

• In arc map the first step is to create an address
  locator

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Arcview uses the address fields from the TIGER
File to begin locating a given address. Before
gecoding an address table, it is necessary to go
into the theme/properties tab and set up the
geocoding address style field.
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Rates of 45-65 of address correctly matched on
the first try are fairly common. The 80 here is
pretty good.
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TIGER files

• Topologically
• Integrated
• Geographic
• Encoding and
• Referencing
• Developed for the US Census Bureau, the best
• base level street maps available.

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Downloading TIGER fileshttp//www.esri.com/data/d
ownload/census2000_tigerline/
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A sample of a TIGER road file for Benton County.
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Abbreviations

• Files are double zipped
• lkA streets 01077 is the FIPS code for state
  and county
• lkHhydrology
• etc.

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• In ArcCatalog open the Address Locator folder and
  create a new Address Locator.
• In the first dialog box, for choosing the style
  of the geocoding service, choose U.S. Streets
  with Zone (FILE)
• In the next dialog box, set the Reference Data
  property to point to your copy of the streets
  file. You can use the defaults for the rest of
  the blanks in this dialog.
• Check out all the options for your Address
  Locator. Especially 'Side Offset'.
• Copy this address locator to your working
  directory.
• Note that there is no way to set relative
  pathnames when referencing your streets data
  file. So expect to have problems with this, if
  you move your working directory!

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To maximize the number of addresses automatically
matched you should

• Dont use periods. Periods are ALMOST NEVER used
  (except when its part of the street name, which
  is very, very unusual)
• Dont spell out street numbers (e.g. 14th St
  NOT Fourteenth St)
• "W" for West and "E" for East (e.g. 215 W 118th
  St). However,"East"and "West" are spelled out
  when its part of the street name (e.g. West Side
  Hwy)
• "th" or "rd" or "st" contiguous with the street
  number, when appropriate (e.g. 215 W 118th St)
• Spell check database with custom dictionary
  (possible)

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When addresses have been geocoded, it is possible
to begin analyzing the spatial distribution of
points, and relationships. In this example,
veterinary clients are seen with median income as
a backdrop.