BoundingBoxAccumulator

Creates a rectangular polygon that spans the extents of all input features.

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Typical Uses

  • Determining the extents of an entire set of features

How does it work?

The BoundingBoxAccumulator receives features with any geometry type and creates the minimum enclosing rectangular polygon that contains all features. The rectangle is not rotated. Its sides are parallel to the x and y axes.

If features are 3D, including point clouds, the bounding box will contain their footprint - that is, their x and y extents.

If an output bounding box has zero area (the bounding box of a single point or vertical line, for example), it will become a point or line as appropriate.

The output bounding box can retain attributes from the input features, either as a single set of attribute values or a list of values from all input features.

Examples

Usage Notes

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

Group-Based

Feature Holding

Yes

Dependencies

None

Aliases

History

 

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