UNIT 29 - DISCRETE GEOREFERENCING

UNIT 29 - DISCRETE GEOREFERENCING

  • A. INTRODUCTION
  • B. STREET ADDRESS
  • C. POSTAL CODE SYSTEMS
  • D. US PUBLIC LAND SURVEY SYSTEM
  • E. GEOLOC GRID
  • F. CENSUS SYSTEMS
  • G. ISSUES CONCERNING DISCRETE GEOREFERENCING
  • REFERENCES
  • DISCUSSION OR EXAM QUESTIONS
  • NOTES

    This lecture concludes the module on geocoding. Several important practical issues are raised here that will be important particularly for those who will be working with economic and demographic databases.

    UNIT 29 - DISCRETE GEOREFERENCING

    A. INTRODUCTION

    B. STREET ADDRESS

    Using addresses in GIS

    Method

    Example - Addmatch using TIGER

    C. POSTAL CODE SYSTEMS

    US ZIP Codes

    Canadian Postal Code

    Problems

    D. US PUBLIC LAND SURVEY SYSTEM

    PLSS References

    E. GEOLOC GRID

    GEOLOC References

    Precision

    F. CENSUS SYSTEMS

    Converting to georeferences

    G. ISSUES CONCERNING DISCRETE GEOREFERENCING

    Hooks

    Purpose

    Standardization

    REFERENCES

    Strahler, A.N. and A.H. Strahler, 1987. Modern Physical Geography, 3rd edition, Wiley, New York. Contains a thorough description of the US PLSS.

    U.S. Department of Commerce, Bureau of the Census, 1988. Tiger/Line File: Boone County, Missouri, Technical Documentation, Washington, D.C.

    Whitson, J. and M. Sety, 1987. "GEOLOC Geographic Location System", Fire Management Notes, 46:30-32.

    DISCUSSION OR EXAM QUESTIONS

    1. Determine the resources available to you in geocoding street addresses for your local area. What sources exist for obtaining (a) street index (DIME or TIGER) files, (b) address matching software, (c) maps with address ranges marked on streets? Estimate the time it would take to geocode 1000 addresses in this area using various combinations of these resources. What percentages of hits and misses would you anticipate? Estimate the cost per address which you would have to charge a sponsoring agency for such a project.

    2. Discuss the usefulness of the PLSS as a georeferencing system in your local area. How complete is it? What local agencies or organizations make use of the PLSS? What is its relationship to the local system of land tenure?

    3. Determine the 5 discrete georeferences described in this unit for your own residence. What problems do you have in doing this? What is the potential or actual precision of each method?

    4. Discuss the ways in which the system of discrete georeferencing in the US (or your own country) might be improved. What is the appropriate level or agency of government to sponsor or undertake such an improvement? Which existing system of georeferencing should it be based on? Who are the potential users of such a system, and how might cost be shared?


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