BoundsExtractor

Extracts a feature’s minimum and maximum coordinate values into attributes.

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Typical Uses

  • Determining a feature’s extents as attribute values instead of geometry.

How does it work?

The BoundsExtractor receives features with any type of geometry and individually extracts their minimum and maximum x, y, and z coordinate values, storing them as attributes.

Where coordinate values do not exist (such as z values on 2D geometry or non-spatial features) a value of zero (0) is assigned.

To exclude an attribute, leave the parameter blank and it will not be added to the output features.

Feature geometry is unchanged.

Examples

Usage Notes

  • Point cloud extents need to be recalculated after some operations. Consider using the PointCloudPropertyExtractor and its Calculate and Update Extents parameter instead.

  • To extract minimum and maximum values on attributes, use the StatisticsCalculator.

Creating Boxes and Rectangles

Creating rectangular geometry is a common task. These transformers do so in a variety of ways.

Transformer

Function

Creator

Creates one or more new features with box geometry of a specific size and position (when Geometry Object is Box).

2DBoxReplacer

Replaces an existing feature’s geometry with a box of a specific size and position.

BoundingBoxAccumulator

Creates one rectangle that encompasses all features received.

BoundingBoxReplacer

Individually replaces the geometry of each feature with a rectangle that covers its extents.

RasterExtentsCoercer

Individually replaces the geometry of each raster feature with a rectangle that covers its extents (with various Extents Type options).

BoundsExtractor

Extracts the coordinate values that describe an individual feature’s bounding box (or cube) and stores them as attributes.

2DGridAccumulator

Creates a series of regularly-spaced rectangles that span the extent of all features received (when Type of Grid to Create is Polygons).

2DGridCreator

Creates a series of regularly-spaced rectangles of a specific size and position (when Type of Grid to Create is Polygons).

Tiler and RasterTiler

Do not create actual rectangles, but chop features into a series of rectangular tiles, specified in a similar fashion to the 2DGridAccumulator.

Configuration

Input Ports

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.

Reference

Processing Behavior

Feature-Based

Feature Holding

No

Dependencies None
Aliases  
History  

FME Community

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