Combines feature geometries into heterogeneous or homogeneous aggregates. Alternatively, combines feature attributes without any geometry.

Features are aggregated in the order they are received by this transformer. If the order of individual geometry parts within the resulting aggregate is important, you can first route the features through a Sorter.

Feature geometries and attributes can also be deaggregated using a similar transformer, the Deaggregator.


Geometric Representation

The example below illustrates a geometric feature of diverse attributes on the left and its aggregated output on the right.

Data Structure Representation

The example below illustrates a set of points representing a non-aggregated data structure on the left and its corresponding aggregated output on the right.

Usage Notes

  • This transformer will not dissolve adjacent area boundaries – it simply creates a collection of all that it is given. Use the Dissolver if adjacent areas are to be merged into a single area.



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.

Dialog Options - Tables

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

FME Community

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Keywords: AttributeAccumulator