TIGER/Line(TM) Files, 1992

                           Table of Contents

Acknowledgments

Table of Contents

Introduction
    Type of File and Geographic Extent.........................i-1
    Principal Differences Between the 1990 Census TIGER/Line 
         Files  and the 1992 TIGER/Line Files..................i-1
       New Record Types Added..................................i-2
       Boundary and Area Changes...............................i-2
       Previously Blank Fields Filled..........................i-2
       New Address Ranges and ZIP Codes(R).....................i-2
    File Availability..........................................i-3
    How to Use This Documentation..............................i-3
    Figure I-1 -- TIGER/Line (TM) Census Files, 1990 Address 
               Range Coverage..................................i-5
    Figure I-2 -- TIGER/Line (TM) Files, 1992 
               Residential Address Coverage....................i-6
       
Chapter 1:  An Overview and Geographic Concepts
Overview.......................................................1-1
    What is TIGER?.............................................1-1
    TIGER Data Base Extracts...................................1-2
    Relationship of TIGER/Line(TM) to 1990 Census
        Statistical Data.......................................1-2
    Related Files..............................................1-2
    County-Based Files.........................................1-3
    The Data Content of the TIGER/Line(TM) Files...............1-3
Topology and Spatial Objects in the TIGER/Line(TM) Files.......1-4
    Spatial Objects in the TIGER/Line(TM) Files................1-4
    Topology...................................................1-4
    Terminology................................................1-5
    Features...................................................1-6
    Left- and Right-Side Data Fields...........................1-6
    Single-Layer Topology......................................1-7
Introduction to the TIGER/Line(TM) File Structure..............1-7
    Basics.....................................................1-7
Description of the TIGER/Line(TM) 1992 Record Types............1-7
    Record Type 1 -- Basic Data Record for Complete Chains.....1-7
    Record Type 2 -- Shape Point Coordinates...................1-8
    Record Type 3 -- Additional 1990 and 1980 Decennial Census 
           Geographic Entity Codes.............................1-8
    Record Type 4 -- Index to Alternate Feature Identifiers....1-8
    Record Type 5 -- Feature Identifier List...................1-8
    Record Type 6 -- Additional Address Range and ZIP Code(R)
           Data................................................1-8
    Record Type 7 -- Landmark Features.........................1-8
    Record Type 8 -- Polygons Linked to Area Landmarks.........1-9
    Record Type A -- Additional Polygon Geographic 
           Entity Codes........................................1-9
    Record Type F -- Corrected Geographic Entity Codes 
           for the 1990 Census.................................1-9
    Record Type G -- 1992 Geographic Codes and Entity Changes..1-9
    Record Type I -- The Link Between Complete Chains 
           and Polygons........................................1-9
    Record Type P -- Polygon Internal Point....................1-9
    Record Type R -- Record Number Range.......................1-10
    The Relationship Between Spatial Objects and TIGER/Line(TM) 
        Record Types...........................................1-10
    Linkages Between Record Types..............................1-10
    Figure 1-1 -- Basic TIGER/Line(TM) File Topology...........1-11
    Figure 1-2 -- TIGER/Line(TM) File Record Linkages..........1-12
              
Chapter 2:  Version Code and Record Identification Numbers       
    Version Code...............................................2-1
       Identification..........................................2-1
       Codes:  Version Code....................................2-1
    TIGER/Line Identification Number (TLID)....................2-1
       Identification..........................................2-1
       Codes:  TLID............................................2-1
       Record Locations:  TLID.................................2-2
       Record Linkages:  TLID..................................2-2
       Sort Sequence:  TLID....................................2-2
    User Defined Changes to the 1992 TIGER/Line Files..........2-2
       TLID as a Standard Identification Number................2-2
       Feature Changes.........................................2-3
    TIGER/Line (TM) Polygon Identification Numbers
           (CENID and POLYID)..................................2-3
       Identification..........................................2-3
       CENID...................................................2-3
       POLYID..................................................2-3
    Codes:  CENID and POLYID...................................2-4
       CENID...................................................2-4
       POLYID..................................................2-4
       Record Locations:  CENID and POLYID.....................2-4
       Record Linkages:  CENID and POLYID......................2-5
       Sort Sequence:  CENID and POLYID........................2-5
    TIGER/Line(TM) Landmark Identification Numbers (LAND)......2-6
       Identification..........................................2-6
       Codes:  LAND............................................2-6
       Record Locations:  LAND.................................2-6
       Record Linkages:  LAND..................................2-6
       Sort Sequence:  LAND....................................2-6
       
Chapter 3:  Geographic Objects in the TIGER/Line(TM) File
    Line Features..............................................3-1
       Feature Identifiers.....................................3-1
           Identification......................................3-1
           Record Locations:  Feature Identifiers..............3-3
           Codes:  Feature Identifier..........................3-3
              Directionals (Prefix and Suffix).................3-3
              Feature Names....................................3-3
              Feature Types....................................3-4
                  Standard Feature Types.......................3-4
       Data Limitations and Notes .............................3-5
       Corporate Corridors and Corporate Offset Boundaries.....3-5
       Feature Identifier Record Linkage.......................3-5
           Concepts............................................3-5
           Record Locations:  Feature Identification Numbers...3-6
           Codes:  Feature Identification Numbers..............3-6
    Address Ranges and ZIP Codes(R)............................3-6
       Identification..........................................3-6
           Address Ranges......................................3-7
           Imputed Address Ranges..............................3-9
           ZIP Codes(R)........................................3-10
       Address Information Methodology.........................3-10
           Pre-1990 Census Address Ranges......................3-10
           Expanded Addresses..................................3-11
           The Relationship Between Pre-existing and ACF 
                 Address Ranges................................3-11
           Record Locations:  Address Ranges...................3-12
           Record Locations:  Impute Flags.....................3-12
           Record Locations:  ZIP Codes(R).....................3-12
       Codes:  Address Ranges and Impute Flags.................3-12
           Address Ranges......................................3-12
           Impute Flags/Source Flags...........................3-13
           ZIP Codes(R)........................................3-13
       Limitations.............................................3-13
       Corporate Corridors and Corporate Limit Offset 
             Boundaries........................................3-13
       Record Linkages.........................................3-14
    Boundaries of Geographic Entities..........................3-14
       Identification..........................................3-14
       Record Linkages and Boundary Extraction.................3-14
       Single-Side Flags and County Boundaries.................3-15
       Record Locations:  Single-Side Flag.....................3-16
       Codes:  Single-Side Flag................................3-16
    CFCC's.....................................................3-16
       Identification..........................................3-16
       Record Location:  CFCC..................................3-16
       Codes:  CFCC's..........................................3-16
       CFCC's Used for Both Complete Chains and Landmarks......3-17
    Points Describing the Complete Chain.......................3-17
       Identification..........................................3-17
       Nodes...................................................3-17
       Shape Points............................................3-17
       Coordinates for Nodes and Shape Points..................3-18
       Record Locations:  Coordinates for Nodes and 
             Shape Points......................................3-18
       Values:  Coordinates....................................3-19
       Record Linkages/Feature Chaining........................3-19
    Polygons...................................................3-20
       Overview of Polygon Features............................3-20
           Description.........................................3-20
       Geographic Entity Codes.................................3-21
           Identification......................................3-21
       Internal Points.........................................3-21
           Identification......................................3-21
           Coordinate Notation.................................3-21
           Record Locations:  GT-Polygon Internal Point
                 Coordinates........................... .......3-22
           Values:  Coordinates................................3-22
       Record Linkages.........................................3-22
           Description.........................................3-22
    Landmark Features..........................................3-23
       Overview of Landmark Features...........................3-23
           Description.........................................3-23
       Point, Line, and Area Landmark CFCC's...................3-24
           Identification......................................3-24
           Record Locations:  Landmark CFCC's..................3-24
           Codes:  Landmark CFCC's.............................3-24
       Landmark Feature Name...................................3-26
           Identification......................................3-26
           Record Locations:  Landmark Feature.................3-26
           Codes:  Landmark Feature Names......................3-27
       Point Landmark Locations................................3-27
           Identification......................................3-27
           Coordinates.........................................3-27
           Record Locations:  Point Landmark Location 
              Point Coordinates................................3-27
           Values:  Coordinates................................3-27
       Area Landmark Locations.................................3-27
           Identification......................................3-27
    Figure 3-1 -- TIGER/Line(TM) Address Range Basics..........3-29
    Figure 3-2 -- TIGER/Line(TM) Multiple and Mixed Parity
              Address Ranges...................................3-30
    Figure 3-3 -- Address Range Special Cases..................3-31
    Figure 3-4 -- TIGER/Line(TM) Address Range Imputes.........3-32

Chapter 4:  Geographic Entities
    OVERVIEW...................................................4-1
       Introduction............................................4-1
       Boundary and Area Changes...............................4-1
       Codes for Entities......................................4-2
    GEOGRAPHIC ENTITIES........................................4-2
       AI/ANA's................................................4-2
           Identification......................................4-2
              Legal Entities...................................4-2
                  American Indian reservations (AIR's).........4-2
                  American Indian trust lands..................4-3
              Statistical Entities.............................4-3
                  Alaska Native village statistical areas 
                        (ANVSA's)..............................4-3
                  Tribal designated statistical areas (TDSA's).4-3
                  Tribal jurisdiction statistical areas 
                        (TJSA's)...............................4-3
           Record Location:  AI/ANA Codes......................4-4
           Codes:  AI/ANA's....................................4-4
       ANRC's..................................................4-4
           Identification......................................4-4
           Record Locations:  ANRC Codes.......................4-4
           Codes:  ANRC's......................................4-4
       Block Groups (BG's).....................................4-5
           Identification......................................4-5
              Geographic BG's..................................4-5
              Tabulation BG's..................................4-5
           Record Locations:  BG Numbers.......................4-5
           Codes:  BG's........................................4-5
       Census Blocks...........................................4-6
           Identification......................................4-6
           Census Block Numbers................................4-6
              Water Blocks.....................................4-6
              1980 Census Blocks...............................4-7
              Corrected 1990 Block Numbers 
                     with a Second Suffix......................4-7
              Current Geography................................4-8
           Record Locations:  Census Block Numbers.............4-8
           Codes:  Census Blocks...............................4-8
              Tabulation block suffix..........................4-9
              Correction block suffix for 
                    1990 corrected geography...................4-9
              Examples.........................................4-9
       Census Tracts and BNA's.................................4-10
           Identification......................................4-10
              Census tracts....................................4-10
              BNA's............................................4-10
              Numbering........................................4-10
              Boundaries and Boundary Changes..................4-11
              Relationship to Other Geographic Entities........4-11
           Record Locations:  Census Tract/BNA Codes...........4-12
           Codes:  Census Tracts/BNA's.........................4-12
       Counties and Statistically Equivalent Entities..........4-12
           Identification......................................4-12
           Record Locations:  County and County 
                 Equivalents Codes.............................4-13
           Codes:  County and County Equivalents...............4-13
       County Subdivisions.....................................4-14
           Identification......................................4-14
              Legal Entities...................................4-14
                  MCD's........................................4-14
              Statistical Entities.............................4-14
                  CCD's........................................4-14
                  Census Subareas..............................4-15
                  UT's.........................................4-15
           Record Locations:  County Subdivision Codes.........4-16
           Codes:  County Subdivisions.........................4-16
       Congressional District..................................4-16
           Identification......................................4-16
           Record Locations:  Congressional Districts..........4-16
           Codes:  Congressional Districts.....................4-17
       Crews-of-Vessels........................................4-17
           Identification......................................4-17
           Record Locations:  Crews-of-Vessels.................4-18
           Codes:  Crews-of-Vessels............................4-18
       Places..................................................4-18
           Identification......................................4-18
              Legal Entities...................................4-18
                  Incorporated Places..........................4-18
                  Consolidated City............................4-18
              Statistical Entities.............................4-19
                  CDP's........................................4-19
              Dependent and Independent Places.................4-19
              Corporate Corridors and Offset 
                    Corporate Boundaries.......................4-19
              Field Size.......................................4-20
           Record Locations:  Incorporated Place/CDP Codes.....4-20
           Codes:  Incorporated Places/CDP's...................4-20
       School Districts........................................4-21
           Identification......................................4-21
           Record Locations:  School District Codes............4-21
           Codes:  School Districts............................4-22
       States and Statistically Equivalent Entities............4-22
           Identification......................................4-22
           Record Locations:  State Codes......................4-23
           Codes:  States......................................4-23
       Sub-MCD's...............................................4-23
           Identification......................................4-23
           Record Locations:  Sub-MCD Codes....................4-24
           Codes:  Sub-MCD's...................................4-24
       Traffic Analysis Zone (TAZ).............................4-24
           Identification......................................4-24
           Record Locations:  TAZ Codes........................4-24
           Codes:  TAZ's.......................................4-24
       Urbanized Areas (UA's)..................................4-24
           Identification......................................4-24
           Record Locations:  UA Codes.........................4-25
           Codes:  UA's........................................4-25
       Urban/Rural Designation (U/R)...........................4-25
           Identification......................................4-25
           Record Locations:  U/R Flags........................4-26
           Codes:  U/R Flags...................................4-26
       Voting Districts (VTD's)................................4-26
           Identification......................................4-26
           Record Locations:  VTD Codes........................4-27
           Codes:  VTD's.......................................4-27
Figure 4-1 -- Hierarchical Relationships of Geographic 
                  Entities in the TIGER/Line Files.............4-28
Figure 4-2 -- Geographic Relationships -- Small Area    
                  Statistical Entities.........................4-29
Figure 4-3 -- Geographic Relationships -- Legal and
                  Statistical Entities.........................4-30
Figure 4-4 -- Corporate Corridors:  Overview...................4-31
Figure 4-5 -- Corporate Corridors:  Detail View................4-32

Chapter 5:  Data Quality
    Introduction...............................................5-1
    Lineage....................................................5-1
       Geometric Properties....................................5-1
       Address Ranges and ZIP Codes(R).........................5-2
       Source Codes............................................5-2
       Record Locations:  Source Codes.........................5-3
    Positional Accuracy........................................5-3
       General.................................................5-3
    Attribute Accuracy.........................................5-3
       Geometric Properties....................................5-3
       Boundaries and Geographic Entity Codes..................5-4
       Address Ranges and ZIP Codes(R).........................5-5
    Logical Consistency........................................5-5
       General.................................................5-5
    Completeness...............................................5-6
       General.................................................5-6

Chapter 6:  The 1992 TIGER/Line Files Data Dictionary
    Record Type 1 --  Basic Data Record for Complete Chains....6-1
    Record Type 2 --  Shape Point Coordinates..................6-4
    Record Type 3 --  Additional 1990 and 1980 Decennial 
                  Census Geographic Entity Codes...............6-6
    Record Type 4 --  Index to Alternate Feature Identifiers...6-8
    Record Type 5 --  Feature Identifier List..................6-9
    Record Type 6 --  Additional Address Range and 
                  ZIP Code(R) Data.............................6-10
    Record Type 7 --  Landmark Features........................6-11
    Record Type 8 --  Polygons Linked to Area Landmarks........6-12
    Record Type A --  Additional Polygon Geographic 
                  Entity Codes.................................6-13
    Record Type F --  Corrected Geographic Area Codes 
                  for the 1990 Census..........................6-15
    Record Type G --  1992 Geographic Codes and 
                  Entity Changes...............................6-16
    Record Type I --   The Link Between Complete Chains 
                  and Polygons.................................6-17
    Record Type P --  Polygon Internal Point...................6-18
    Record Type R --  Record Number Range......................6-19

Appendix A -- FIPS State and County Codes

Appendix B -- SDTS Definitions for Spatial Objects

Appendix C -- 1992 TIGER/Line File, Field Name Changes

Appendix D -- Standard Abbreviations

Appendix E -- Census Feature Class Codes (CFCC)

Appendix F -- Numbers of Decennial Census Geographic Entities 

Appendix G -- Urbanized Area Codes and Names

Appendix H -- Source Codes

Appendix I -- Acronyms and Abbreviations

Bibliography

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