DonutBuilder

Cuts holes in polygonal features by making polygons completely enclosed in other polygons into holes of the containing polygon.

The DonutBuilder assumes that the input area features are topologically clean. Further, it is assumed that any two input polygons within a group either have a strict containment relationship, or are not overlapping.

Aggregate features are decomposed recursively to their components and non-area features will be output via the <Rejected> port.

Example

Configuration

Output Ports

Parameters

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: island Donutizer