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# USGS TIGER

TIGER/Line files are created by the US Census Bureau and cover the entire US. They are often referred simply as TIGER files. For more information see: http://www.census.gov/geo/www/tiger/.

## File listing

TIGER/Line files are text files and directory-based data sources. For example, one county folder TGR06059 contains several associated files:

    TGR06059.RT1 TGR06059.RT2 TGR06059.RT4 TGR06059.RT5
    TGR06059.RT6 TGR06059.RT7 TGR06059.RT8 TGR06059.RTA
    TGR06059.RTC TGR06059.RTH TGR06059.RTI TGR06059.RTP
    TGR06059.RTR TGR06059.RTS TGR06059.RTT TGR06059.RTZ

## Data Access / Connection Method

- TIGER/Line access occurs through an OGR CONNECTION

- The full path to the directory containing the associated files is required in the CONNECTION string.

- The feature type is specified in the DATA parameter

### OGRINFO Examples

Using ogrinfo on a TIGER directory to retrieve feature types:

    > ogrinfo TGR06059 (NOTE that this is a directory)
    ERROR 4: Tiger Driver doesn't support update.
    Had to open data source read-only.
    INFO: Open of `TGR06059'
    using driver `TIGER' successful.
    1: CompleteChain (Line String)
    2: AltName (None)
    3: FeatureIds (None)
    4: ZipCodes (None)
    5: Landmarks (Point)
    6: AreaLandmarks (None)
    7: Polygon (None)
    8: PolygonCorrections (None)
    9: EntityNames (Point)
    10: PolygonEconomic (None)
    11: IDHistory (None)
    12: PolyChainLink (None)
    13: PIP (Point)
    14: TLIDRange (None)
    15: ZeroCellID (None)
    16: OverUnder (None)
    17: ZipPlus4 (None)

Using ogrinfo to examine the structure of the TIGER feature type CompleteChain:

    > ogrinfo TGR06059 CompleteChain -summary
    ERROR 4: Tiger Driver doesn't support update.
    Had to open data source read-only.
    INFO: Open of `TGR06059'
    using driver `TIGER' successful.

    Layer name: CompleteChain
    Geometry: Line String
    Feature Count: 123700
    Extent: (-118.125898, 33.333992) - (-117.412987, 33.947512)
    Layer SRS WKT:
    GEOGCS["NAD83",
    DATUM["North_American_Datum_1983",
            SPHEROID["GRS 1980",6378137,298.257222101]],
    PRIMEM["Greenwich",0],
    UNIT["degree",0.0174532925199433]]
    MODULE: String (8.0)
    TLID: Integer (10.0)
    SIDE1: Integer (1.0)
    SOURCE: String (1.0)
    FEDIRP: String (2.0)
    FENAME: String (30.0)
    FETYPE: String (4.0)
    FEDIRS: String (2.0)
    CFCC: String (3.0)
    FRADDL: String (11.0)
    TOADDL: String (11.0)
    FRADDR: String (11.0)
    TOADDR: String (11.0)
    FRIADDL: String (1.0)
    TOIADDL: String (1.0)
    FRIADDR: String (1.0)
    TOIADDR: String (1.0)
    ZIPL: Integer (5.0)

Map File Example:

    LAYER
      NAME Complete_Chain
      TYPE LINE
      STATUS DEFAULT
      CONNECTIONTYPE OGR
      CONNECTION "/path/to/data/tiger/TGR06059"
      DATA "CompleteChain"
      CLASS
        STYLE
          COLOR 153 102 0
        END
      END
    END # Layer