CoordinateExtractor

In this example, we have a geodatabase containing address points. Note that the point features have 15 exposed attributes, and are in a UTM coordinate system. We want to extract the coordinates of each point into attributes for use elsewhere.

The address points are routed into a CoordinateExtractor.

In the parameters dialog, Mode is set to Specify Coordinate. The Coordinate Index default is zero (0), the first one, which is correct. Default names are also provided for the X, Y, and Z output attributes.

Note that although Mode > All Coordinates would also return just one set of coordinates per point, and wouldn’t require setting a Coordinate Index number, they would be added as a list attribute, potentially requiring additional transformers to work with.

The output features have added attributes - _x, _y, and _z. Note that the coordinate values are in meters due to the UTM coordinate system.

The Z Attribute did not receive a value, as the data is 2D and we did not provide a Default Z Value.

In this example, we have a set of park polygons, and want to retrieve all of the coordinates for them.

The features are routed into a CoordinateExtractor.

In the parameters dialog, Mode is set to All Coordinates. A default name is provided for the Coordinates List Name - _indices.

The output features have an added list attribute named _indices containing coordinates for each vertex of the polygon.

Note that each coordinate has an x and y value only. Z was not added as the data is 2D and we did not provide a Default Z Value.

In this example, we want to retrieve the coordinates of the first and last points of these transit lines. Note that the original features have nine attributes.

The features are routed through two CoordinateExtractors, one to extract the first point and one to extract the last.

In the parameters dialog of the first CoordinateExtractor, Mode is set to Specify Coordinate and Coordinate Index is set to zero (0), indicating the first vertex.

The X and Y Attribute names are edited to start_x and start_y.

Similarly, in the parameters dialog of the second CoordinateExtractor, Coordinate Index is set to -1, indicating the last vertex. X and Y Attribute are set as end_x and end_y.

The output features have added attributes containing the requested coordinate values.

This transformer accepts any feature.

Features with extracted coordinates stored in either attributes or list attributes as specified in the parameters.

Features where either an invalid Coordinate Index or invalidDefault Z Value has been provided will be routed to the <Rejected> port.

Rejected features will have an fme_rejection_code attribute with one of the following values:

INVALID_PARAMETER_DEFAULT_Z
INVALID_PARAMETER_INDEX

Rejected Feature Handling: can be set to either terminate the translation or continue running when it encounters a rejected feature. This setting is available both as a default FME option and as a workspace parameter.

Output Attribute Names

Defining Values

There are several ways to define a value for use in a Transformer. The simplest is to simply type in a value or string, which can include functions of various types such as attribute references, math and string functions, and workspace parameters.

Using the Text Editor

The Text Editor provides a convenient way to construct text strings (including regular expressions) from various data sources, such as attributes, parameters, and constants, where the result is used directly inside a parameter.

Text Editor

Using the Arithmetic Editor

The Arithmetic Editor provides a convenient way to construct math expressions from various data sources, such as attributes, parameters, and feature functions, where the result is used directly inside a parameter.

Arithmetic Editor

Conditional Values

Set values depending on one or more test conditions that either pass or fail.

Parameter Condition Definition Dialog

Content

Expressions and strings can include a number of functions, characters, parameters, and more.

When setting values - whether entered directly in a parameter or constructed using one of the editors - strings and expressions containing String, Math, Date/Time or FME Feature Functions will have those functions evaluated. Therefore, the names of these functions (in the form @<function_name>) should not be used as literal string values.

Content Types

String Functions	These functions manipulate and format strings.
Special Characters	A set of control characters is available in the Text Editor.
Math Functions	Math functions are available in both editors.
Date/Time Functions	Date and time functions are available in the Text Editor.
Math Operators	These operators are available in the Arithmetic Editor.
FME Feature Functions	These return primarily feature-specific values.
FME Parameters	FME and workspace-specific parameters may be used.
Creating and Modifying User Parameters	Create your own editable parameters.

Table Tools

Transformers with table-style parameters have additional tools for populating and manipulating values.

Note: Not all tools are available in all transformers.