Extracts a feature’s number of dimensions, storing the resulting value of 2 or 3 in an attribute.
Typical Uses
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Separating 2D and 3D features
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Performing data quality testing
How does it work?
The DimensionExtractor receives any type of geometry and extracts the feature’s dimensionality into an attribute. The result will be either 2 or 3, representing 2D or 3D geometry.
Note that all features, including those without geometry, will be either 2D or 3D.
Examples
Example: Separating 2D and 3D features in a dataset
In this example, we have a set of building footprints, some of which have been extruded to their above-ground height and made into 3D objects.
We want to isolate the features that are still 2D in order to work on them.
The features are first routed into a DimensionExtractor, and then on to an AttributeFilter to separate them.
In the parameters dialog of the DimensionExtractor, the default Output Attribute Name for Dimension is kept.
The features are then filtered based on the _dimension attribute.
Inspecting the results from the 2 output port, we see only the 2D features, with a _dimension attribute value of 2.
Configuration
Input Ports
Input
This transformer accepts any feature.
Output Ports
Output
Features with an attribute containing either 2 or 3.
Parameters
Output Attribute Name
|
Dimension |
Name the attribute to contain the dimension value, which will be either 2 or 3. |
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. |
|
Filter
|
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.
Reference
|
Processing Behavior |
|
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Feature Holding |
No |
| Dependencies | None |
| Aliases | DimensionCalculator |
| History |
FME Community
The FME Community is the place for demos, how-tos, articles, FAQs, and more. Get answers to your questions, learn from other users, and suggest, vote, and comment on new features.
Search for all results about the DimensionExtractor on the FME Community.
Examples may contain information licensed under the Open Government Licence – Vancouver and/or the Open Government Licence – Canada.