Geocoding - Advanced Techniques

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Geocoding - Advanced Techniques

• July 23 - 27, 2012

• Agatha Wong
• Brad Niemand
• Sergey Ivanenko

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Outline

• Overview of geocoding engine and matching process
• Managing performance
• Fine tuning locators a few examples
• Sharing locators

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What This Workshop Does Not Cover

• Basic geocoding process
• Covered in the Geocoding An Introduction
  Technical Workshop
• Programming with ArcObjects, Web APIs
• Address data model and tools

Please meet with the geocoding team at the
Spatial Analysis Island to discuss about these
topics or issues you may have.
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Overview of Geocoding Engine and Matching Process

• Handling of ambiguous addresses
• Example 10 North Point Road
• No penalty for missing zone information
• Can parse any input field, not just Street Name
• Returns matching address as it is written in the
  reference data
• Single line input
• Supports Unicode for international geocoding
• Highly configurable
• Single XML file

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Demo

• Finding a few interesting addresses

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Geocoding Engine Grammar

• All supported forms of addresses are explicitly
  defined in a grammar.

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Geocoding Engine Grammar (continued)

• Grammar example
• Address House StreetName City // 380
  New York St Redlands StreetName
  StreetName City // Main St 2nd Ave
  Springfield SpatialOperator Address
  // 100 ft SW from 5 Main St
• StreetName PreDir PreType Name SufType SufDir
• House number // 123
  number - number // 17-100 number
  letter // 100A
• PreDir N E W S NW SW
  NE SE
• PreType Ave Hwy
• SufType Ave St Rd

Handles ambiguous addresses No standardization
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Geocoding Engine Aliases

• Common abbreviated forms (aliases)
• Mt, Mtn, Mount, Mountain mean the same in
  the context of a City name
• Same for View vs. Vw
• There are many ways to spell Mountain View
• Mountain View
• Mt View
• Mtn View
• Mount View
• Mountain Vw
• Mt Vw
• Mtn Vw
• Mount. Vw

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Locator Styles
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Displaying Locator Contents on Internet Browser
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Locator Styles (with XML Editor)

• Aliases

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Customizing ArcGIS 10x Locators

• An Esri Geocoding Technical Paper
• http//resources.arcgis.com/en/communities/geocodi
  ng/

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Managing Performance

• Multi-threading
• Presort data
• Search timeout
• Search candidates
• Search extent

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Locator Properties
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Demo

• Managing performance

• Brad Niemand

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Fine Tuning Locators A Few Examples

• Return candidates based on rank
• Use parity values from reference data
• Use multiple tables and feature classes for
  creating a locator

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Demo

• Adding ranks

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Ranking

• Incomplete or ambiguous information may result in
  multiple perfect matches (ties)
• Candidate order is undetermined

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Ranking (continued)

• Affects candidate preference (candidate sorting)
  when the scores are equal
• Styles that use ranking
• US Address - City State
• General - City State Country
• General - Gazetteer

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Ranking (continued)

• Use RANK field to enforce candidate priority

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Ranking (continued)

• With RANK applied, preferred candidate returned
  as a match result

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Ranking (continued)

• Out of the box ranking order is ascending (from
  smallest to the largest number)
• Can be changed in the .loc.xml (or lot.xml)
  configuration file

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Demo

• Using parity

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House Range Parity

• Applies to street centerline locators
• Affects house number match score

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Main St
98
1
2
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House Range Parity (continued)

• Default handling of range parity
• If both From and To houses are even, the range is
  assumed to have even house numbers
• (same rule for odd numbers)
• If From and To are mixed with odd and even
  numbers, the range is assumed to be of mixed
  parity
• Both even and odd house numbers are assumed to be
  present along the segment

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House Range Parity (continued)
Main St
100
198
implied EVEN parity
150 Main St matches range
151 Main St wrong parity score
deduction
Main St
101
198
implied MIXED parity (implied parity BOTH)
150 Main St matches range
151 Main St matches range
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House Range Parity (continued)

• Downloadable style
• Search for locator parity at www.arcgis.com
• Optional support for parity fields
• Parity codes
• D default (implied parity)
• also blank value
• E even
• O odd
• B both (mixed parity)

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House Range Parity (continued)
After
Before
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Demo

• Using multiple tables for building locators

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Fine Tuning Locators Multiple Tables

• US Bureau of Census TIGER/line files and
  relationship tables

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Fine Tuning Locators Multiple Tables

• US Bureau of Census TIGER/line files

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Fine Tuning Locators Multiple Tables (continued)

• Custom locator style to support multiple tables

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Fine Tuning Locators Multiple Tables (continued)

• Locator style can be found in Esri Resource
  Center
• http//resources.arcgis.com/en/communities/geocodi
  ng

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Sharing Locators

• Locator Package
• ArcGIS.com
• Geocode services

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Packing Locators as a File (.gcpk)
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Packaging Locators and Sharing via ArcGIS.com
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Demo

• Packaging locators

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Geocoding with a geocode service

• ArcGIS Online (arcgis.com)

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Sharing as a Geocode Service

• Geocode services published with ArcGIS Server

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Sharing Geocode Services in Cloud
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Summary - ArcGIS 10.1 geocoding

• Easier to configure settings for locators
• New Locator Properties dialog box
• More options to manage performance
• Multi-threading
• Use map extent
• Set search time-out and maximum number of
  candidates
• Improve matching quality
• Rank
• Parity
• Sharing locators and services
• Locator packages
• ArcGIS.com
• Geocode services

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Resources and References

• Esri Resource Centers
• http//resources.arcgis.com/en/communities/geocodi
  ng

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Additional Geocoding Sessions

• Geocoding An Introduction
• Wednesday 130 PM, (Room 14A) Offering II
• ESRI Showcase Software Island Demo Theater
• From a table of addresses to locations on the map
  (Tuesday 200 PM)
• Visit the Spatial Analysis Island in the Exhibit
  Hall

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• Thank you for attending
• Have fun at UC2012
• Open for Questions
• Please fill out the evaluation
• www.esri.com/ucsessionsurveys
• First Offering ID 634
• Second Offering ID 804

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Steps to evaluate UC sessions

• My UC Homepage gt Evaluate Sessions
• Choose session from planner
• OR
• Search for session

• www.esri.com/ucsurveysessions

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