FME Transformers: 2024.1

Categories
Geometries
Spatial Analysis
Related Transformers
AreaAmalgamator
AreaGapAndOverlapCleaner
AreaOnAreaOverlayer
DonutHoleExtractor
SolidDissolver
SurfaceDissolver

Dissolver

Combines overlapping and/or adjacent areas into larger contiguous areas by removing shared and interior edges.

Jump to Configuration

Typical Uses

  • Simplifying geometry
  • Combining areas for statistical analysis

How does it work?

The Dissolver receives features with area geometry and combines them wherever they touch or overlap. Shared edges and linear boundaries inside overlapping areas are removed from the resulting polygon, and output separately.

Input feature attributes may be optionally accumulated as a list attribute. Statistics can be calculated on numeric attributes, including sum, average, and weighted average (by area). The number of polygons dissolved to create each output area can be stored in an attribute.

Gaps and slivers that occur where adjacent areas are not perfectly identical are considered a match to dissolve if they fall within a specified tolerance.

Aggregates may be either deaggregated or rejected.

Z values are supported.

 

Input

Dissolved

Remnants

Shared Edges

Overlaps

Donut Polygons

Examples

Usage Notes

  • Unexpected results often indicate issues with the input data.

Creating and Modifying Area Features

These transformers work with polygons in a variety of ways.

Configuration

Input Ports

Output Ports

Parameters

Editing Transformer Parameters

Transformer parameters can be set by directly entering values, using expressions, or referencing other elements in the workspace such as attribute values or user parameters. Various editors and context menus are available to assist. To see what is available, click beside the applicable parameter.

For more information, see Transformer Parameter Menu Options.

Reference

Processing Behavior

Group-Based

Feature Holding

Yes

Dependencies None
Aliases  
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 Dissolver on the FME Community.

 

Examples may contain information licensed under the Open Government Licence – Vancouver, Open Government Licence - British Columbia, and/or Open Government Licence – Canada.