Creates a set of measures attached to the geometry of the feature, where each value is the distance from the start of the line up to that vertex, multiplied by the given Multiplier.
This transformer is often used to load useful measure values into an attribute for writing to measure-supporting formats.
- To get measures as a list or a series of attributes (for example, if you need to manipulate the calculated measure values), place a MeasureGenerator followed by a MeasureExtractor and a ListConcatenator.
- To calculate the entire length of a feature, use the LengthCalculator.
- To calculate the partial length of a feature, use the LengthToPointCalculator.
Configuration
Input Ports
Input
Features with point, curve (path, lines, arcs, oriented arcs, and clothoids), or polygon geometry.
Features with invalid geometry will be output via the <Rejected> port.
Output Ports
Output
Features with a set of measures attached according to parameter selections.
<Rejected>
Invalid input geometry types will be output via this port. Rejected features will receive an explanatory fme_rejection_code attribute.
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.
Parameters
General
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Length Dimension |
The Length Dimension parameter controls how the distance will be calculated. The distance can be calculated as either a two-dimensional distance (in which case any z coordinates on the features will be ignored), or as a three-dimensional distance. The first value will always be 0, since the length up to the very first point is 0. The last value will be the length of the entire line multiplied by the value set in the Multiplier parameter. |
|
Multiplier |
A Multiplier is applied to each distance before it is added to the list, to potentially scale each measurement by a fixed amount. By default, the multiplier is 1. |
|
Start Value |
A Start Value is added to each distance before it is added to the list, to potentially add an offset to each measurement by a fixed amount. By default, the start value is 0. |
Output Attribute Name
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Measure Name |
You can enter an optional name for the resulting measures. |
Editing Transformer Parameters
Using a set of menu options, transformer parameters can be assigned by referencing other elements in the workspace. More advanced functions, such as an advanced editor and an arithmetic editor, are also available in some transformers. To access a menu of these options, click 
beside the applicable parameter. For more information, see Transformer Parameter Menu Options.
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. There are a number of tools and shortcuts that can assist in constructing values, generally available from the drop-down context menu adjacent to the value field.
How to Set Parameter Values
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.
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.
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
| These functions manipulate and format strings. | |
|
Special Characters |
A set of control characters is available in the Text Editor. |
| Math functions are available in both editors. | |
| Date/Time Functions | Date and time functions are available in the Text Editor. |
| These operators are available in the Arithmetic Editor. | |
| These return primarily feature-specific values. | |
| FME and workspace-specific parameters may be used. | |
| Creating and Modifying User Parameters | Create your own editable parameters. |
Dialog Options - Tables
Transformers with table-style parameters have additional tools for populating and manipulating values.
Table Tools
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Row Reordering
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Enabled once you have clicked on a row item. Choices include:
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Cut, Copy, and Paste
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Enabled once you have clicked on a row item. Choices include:
Cut, copy, and paste may be used within a transformer, or between transformers. |
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Filter
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Start typing a string, and the matrix will only display rows matching those characters. Searches all columns. This only affects the display of attributes within the transformer - it does not alter which attributes are output. |
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Import
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Import populates the table with a set of new attributes read from a dataset. Specific application varies between transformers. |
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Reset/Refresh
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Generally resets the table to its initial state, and may provide additional options to remove invalid entries. Behavior varies between transformers. |
Note: Not all tools are available in all transformers.
FME Community
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Search for all results about the MeasureGenerator on the FME Community.
Keywords: chainage