Dissolves area features by removing common boundaries to create larger areas. Input attributes may be accumulated.

Aggregate input will be deaggregated by the transformer. Attributes on the aggregate feature will be propagated to its parts.

Tip  If part-specific attributes, such as areas, need to be computed and preserved, please deaggregate before dissolving.

Because aggregates are deaggregated inside the Dissolver, it is possible that the number of output features will exceed the number of input features.

Dissolved polygons are formed when shared edges and interior edges between adjacent polygons are removed.


The example below shows areas before and after a Dissolver transformer was used.


Input Ports

Output Ports


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

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.

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Keywords: aggregate aggregation "technology preview"