The directives processed by the GRD reader are listed below. The suffixes shown are prefixed by the current <ReaderKeyword> in a mapping file. By default, the <ReaderKeyword> for the GRD reader is GRD.
DATASET
The value for this keyword is the file containing the GRD dataset to be read.
Required/Optional
Required
Mapping File Syntax
GRD_DATASET /usr/data/PenMetrics/test.grd
Workbench Parameter
Source PenMetrics GRD File(s)
EXPAND_INSERTS
This setting determines whether insert features are output as one or several separate features. With YES, each element of the insert blocks are output as separate features. With NO, each insert block is output as a single point feature.
When the reader expands inserts — also referred to as resolving blocks — it outputs one feature for each of the GRD vector entities that are part of the block definition. The original insert is not output. This results in the full graphical representation of the insert transferred through the FME, but the exact insertion point of the insert is lost.
Each insert member feature is given the attribute grd_insert_number set to the same value for each block so the features that comprise each insert may be combined in subsequent processing.
If the exact insertion point of the insert is desired, then insert expansion should be turned off. This results in each insert block being translated into a point feature in the output system.
Required/Optional
Optional
Mapping File Syntax
A typical mapping file fragment specifying that linked features should not be broken looks like:
GRD_EXPAND_INSERTS NO
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