Geocoding Best Practices: Analysis of Geocoding User ...

Geocoding Best Practices: Analysis of Geocoding User Requirements

Daniel W. Goldberg Jennifer N. Swift John P. Wilson

Prepared for: Division of Cancer Prevention and Control National Center For Chronic Disease Prevention and Health Promotion Center for Disease Control and Prevention

Goldberg, Swift and Wilson

Cover Photos: Maps and addresses (University of Southern California GIS Research Laboratory, Department of Geography, 2008).

Preferred Citation: Goldberg DW, Swift JN and Wilson JP 2008 Geocoding Best Practices: Analysis of Geocoding Requirements. Los Angeles, CA, University of Southern California GIS Research Laboratory Technical Report No 9. All material in this report is in the public domain and may be reproduced or copied without permission. However, citation as to source is requested.

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Geocoding Best Practices: Analysis of Minimum Geocoding Requirements

Table of Contents

List of Figures.................................................................................................................................................... iv List of Tables ...................................................................................................................................................... v Executive Summary .......................................................................................................................................... vi 1 Introduction................................................................................................................................................... 1 2 Cancer Registries Surveyed ......................................................................................................................... 2 3 2005 NAACCR Geographic Information Systems Survey.................................................................... 4 4 2006 USC Geocoding Best Practices Survey ........................................................................................... 5

4.1 Reference Data Sources ....................................................................................................................... 5 4.2 Input Data Sources ............................................................................................................................... 7 4.3 Geocode Output ................................................................................................................................. 10 4.4 Accuracy ............................................................................................................................................... 11 4.5 Organizational Geocoding Capacity ................................................................................................ 15 4.6 Software ................................................................................................................................................ 15 4.7 General Methodology Questions...................................................................................................... 16 4.8 Linear-Based Interpolation Methodology ....................................................................................... 17 4.9 Areal Unit-Based Interpolation Methodology ................................................................................ 18 4.10 Manual Geocoding Methodology..................................................................................................... 18 4.11 Feature Matching Methodology........................................................................................................ 18 4.12 Confidentiality...................................................................................................................................... 19 5 2008 USC Geocoding Needs Assessment Survey................................................................................. 20 5.1 General Questions .............................................................................................................................. 20 5.2 Caseload Questions............................................................................................................................. 21 5.3 Training Questions.............................................................................................................................. 23 5.4 Online Geocoding Questions ........................................................................................................... 24 5.5 In-House Geocoding Questions....................................................................................................... 24 5.6 Commercial Geocoding Questions .................................................................................................. 25 5.7 Methodology Questions..................................................................................................................... 26 5.8 Documentation Questions................................................................................................................. 28 6 User Types and Trends.............................................................................................................................. 28 7 Priorities of Registries ................................................................................................................................ 29 8 Conclusions ................................................................................................................................................. 35 9 Acknowledgements .................................................................................................................................... 36 10 References.................................................................................................................................................... 37 11 List of Terms ............................................................................................................................................... 38

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Goldberg, Swift and Wilson

List of Figures

1 Different types of reference data sources used in geocoding .................................................................. 6 2 Different linear reference data sources used in geocoding ...................................................................... 6 3 Perceptions of linear reference data source accuracy and completeness ............................................... 7 4 Different types of input data used in geocoding........................................................................................ 7 5 Influence of input data type on choice of geocoding methodology....................................................... 8 6 Methods used to classify input data ............................................................................................................. 8 7 Utilization and processing of historical addresses ..................................................................................... 8 8 Input data standardization processes........................................................................................................... 9 9 Input data investigation time estimates ..................................................................................................... 10 10 Address input data attributes most commonly updated after investigation...................................... 10 11 Types of users of geocoding results identified by the respondents to the 2006 survey .................. 11 12 Minimum acceptable geocode spatial accuracy (distance).................................................................... 13 13 Maximum acceptable geocode spatial accuracy (distance) ................................................................... 13 14 Acceptable geocode spatial accuracy (distance) ..................................................................................... 14 15 Geocode spatial accuracy achieved (distance)........................................................................................ 14 16 Control over various geocoding activities............................................................................................... 16 17 Length of time respondents have been geocoding................................................................................ 21 18 Reasons for choosing current geocoding process ................................................................................. 21 19 Number of cases geocoded per year........................................................................................................ 22 20 Total geocoding dollar cost vs. number of cases geocoded per year ................................................. 22 21 Dollar cost per geocode vs. number of cases geocoded per year ....................................................... 23 22 Total time cost per geocode (months) vs. number of cases geocoded per year ............................... 23 23 Usage of free online geocoding websites (n=16)................................................................................... 24 24 Free online geocoding websites utilized.................................................................................................. 24 25 Commercial geocoding software utilized ................................................................................................ 25 26 Geocoding methodology utilized ............................................................................................................. 26

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Geocoding Best Practices: Analysis of Minimum Geocoding Requirements

List of Tables

1 Organizations that participated in the 2006 Geocoding Best Practices Survey .................................... 2 2 Organizations that participated in the 2008 Geocoding Capacity Survey ............................................. 3 3 Reference dataset hierarchies used at registries........................................................................................ 27 4 Minimum geocoder user requirements identified from available survey data..................................... 30

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