The directive processed by the TIGER/Line reader are listed below. The suffix shown is prefixed by the current <ReaderKeyword> in a mapping file. By default, the <ReaderKeyword> for the TIGER/Line reader is TIGER.
DATASET
The name of a folder containing one or more TIGER/Line county file sets, or a single TIGER/Line file.
The filenames should all start with TGR, and the extensions should not be altered from the distributed form.
TIGER_DATASET D:\DATA\26_MI
Required/Optional
Required
Workbench Parameter
Source U.S. Census Bureau TIGER/Line File(s)
IDs
This optional specification is used to limit the available and defined TIGER/Line files read.
If IDs are not specified, then all available files are read. The syntax of the IDs directive is:
ReaderKeyword>_IDs <baseName1>\ <baseName2> ... \ <baseNameN>
The example below selects only the TGR26001.* county file set.
TIGER_IDs TGR26001
Required/Optional
Optional
LFIELD_AS_STRING
This optional directive determines whether or not to treat left-justified numeric fields as strings (which will preserve the leading zeros).
If the directive value is “yes”, the attribute values like “09” will be read as “09”. If the directive value is “no”, “09” will be read as “9”.
Note: This directive value can only be set during mapping file generation.
Mapping File Syntax
This example shows how to set the directive during mapping file generation from the command prompt.
> fme GENERATE TIGER NULL <sourceDataset> <outputMappingFile> --Source_LFIELD_AS_STRING no
Required/Optional
Optional
SEARCH_ENVELOPE
Using the minimum and maximum x and y parameters, define a bounding box that will be used to filter the input features. Only features that interact with the bounding box are returned.
If all four coordinates of the search envelope are specified as 0, the search envelope will be disabled.
Mapping File Syntax
<ReaderKeyword>_SEARCH_ENVELOPE <minX> <minY> <maxX> <maxY>
Note: If all four coordinates of the search envelope are specified as zero, the search envelope will be disabled.
Required/Optional
Optional
Workbench Parameter
Minimum X, Minimum Y, Maximum X, Maximum Y
SEARCH_ENVELOPE_COORDINATE_SYSTEM
This directive specifies the coordinate system of the search envelope if it is different than the coordinate system of the data.
The COORDINATE_SYSTEM directive, which specifies the coordinate system associated with the data to be read, must always be set if the SEARCH_ENVELOPE_COORDINATE_SYSTEM directive is set.
If this directive is set, the minimum and maximum points of the search envelope are reprojected from the SEARCH_ENVELOPE_COORDINATE_SYSTEM to the reader COORDINATE_SYSTEM prior to applying the envelope.
Required/Optional
Optional
Mapping File Syntax
<ReaderKeyword>_SEARCH_ENVELOPE_COORDINATE_SYSTEM <coordinate system>
Workbench Parameter
Search Envelope Coordinate System
CLIP_TO_ENVELOPE
This directive specifies whether or not FME should clip features to the envelope specified in the SEARCH_ENVELOPE directive.
Values
YES | NO (default)
Mapping File Syntax
<ReaderKeyword>_CLIP_TO_ENVELOPE [yes | no]
Workbench Parameter
Clip To Envelope
EXPOSED_ATTRS
This directive allows the selection of format attributes to be explicitly added to the reader feature type.
This is similar to exposing format attributes on a reader feature type once it has been generated; however, it is even more powerful because it enables schema-driven applications other than Workbench to access and leverage these attributes as if they were explicitly on the schema as user attributes.
The result of picking a list of attributes is a comma-separated list of attribute names and types that will be added to the schema features. Currently all reader feature types will receive the same set of additional schema attributes for a given instance of the reader.
Required/Optional
Optional
Mapping File Syntax
Not applicable.
While it is possible for FME Objects applications to invoke this directive, the required format is not documented.
This directive is intended for use in our GUI applications (for example, Workbench) only.
Workbench Parameter
Additional Attributes to Expose