AttributeRangeMapper

Classifies features according to user-defined numeric value ranges, adding a new attribute containing the name of the range it falls within.

Jump to Configuration

Typical Uses

Creating a classification of features based on the range of a numeric value
Setting symbology format attributes depending on the range of a numeric value
Reducing complexity by mapping a range of numeric values to a single, representative value

How does it work?

The AttributeRangeMapper lets you define one or more numeric ranges, along with an output value for each. An attribute is selected to be compared against these ranges, and a new attribute is added (Output Attribute) which will contain the name (Output Value) of the first matching range.

If the attribute value does not fall within any of the defined ranges, it is assigned the Default output value (which may be left blank).

Ranges are inclusive. A value that could match more than one range will be assigned the first one it encounters. Ranges are tested in the order they are defined in the parameters dialog, Range Lookup Table. For example, given the ranges 1 - 10 and 10 - 20, the value 10 will be matched to whichever of these ranges is listed first in the lookup table.

If either From or To is left blank, the range is open-ended; that is, it will match any value greater than (if To is blank) or less than (if From is blank) what is specified.

You may automatically generate fixed-interval ranges using the Generate… option.

Examples

Usage Notes

Only numeric ranges are supported
Expressions are not supported
To filter features according to numeric ranges (as opposed to adding an attribute), consider using the AttributeRangeFilter.

Configuration

Input Ports

Output Ports

Parameters

Range Lookup Table

This table specifies a set of ranges and the Output Values that a feature will be sent to if the Source Attribute value is within that range.

From	The lower limit of the range (inclusive). Open-ended if left blank.
To	The upper limit of the range (inclusive). Open-ended if left blank.
Output Value	Name the range. This name will be assigned as a value to the new Output Attribute for matching features. Output Values will be automatically generated if using the Generate… option, and can be overwritten.
Default	If an attribute’s value does not match any input ranges set in the table, the Output Attribute value will be this Default Value. It may be left blank.

Generate…

To automatically generate a set of ranges:
Click the Generate button to start the generation wizard.
Choose the minimum and maximum values of the attribute.
Choose the number of ranges you would you want to generate. The ranges will be equally spaced between the specified minimum and maximum values.
Select the Include Open-ended Ranges checkbox to create two additional ports for values that are smaller than the minimum value or larger than the maximum value.

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.

How to Set Parameter Values

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.

Using the Text Editor

The Text Editor provides a convenient way to construct text strings (including regular expressions) from various data sources, such as attributes, parameters, and constants, where the result is used directly inside a parameter.

Text Editor

Using the Arithmetic Editor

The Arithmetic Editor provides a convenient way to construct math expressions from various data sources, such as attributes, parameters, and feature functions, where the result is used directly inside a parameter.

Arithmetic Editor

Conditional Values

Set values depending on one or more test conditions that either pass or fail.

Parameter Condition Definition Dialog

Content

Expressions and strings can include a number of functions, characters, parameters, and more.

When setting values - whether entered directly in a parameter or constructed using one of the editors - strings and expressions containing String, Math, Date/Time or FME Feature Functions will have those functions evaluated. Therefore, the names of these functions (in the form @<function_name>) should not be used as literal string values.

Content Types

String Functions	These functions manipulate and format strings.
Special Characters	A set of control characters is available in the Text Editor.
Math Functions	Math functions are available in both editors.
Date/Time Functions	Date and time functions are available in the Text Editor.
Math Operators	These operators are available in the Arithmetic Editor.
FME Feature Functions	These return primarily feature-specific values.
FME Parameters	FME and workspace-specific parameters may be used.
Creating and Modifying User Parameters	Create your own editable parameters.

Dialog Options - Tables

Table Tools

Transformers with table-style parameters have additional tools for populating and manipulating values.

Row Reordering

Enabled once you have clicked on a row item. Choices include:

Add a row
Remove a row
Move current row up one
Move current row down one
Move current row to top
Move current row to bottom

Cut, Copy, and Paste

Enabled once you have clicked on a row item. Choices include:

Cut a row - delete and copy to clipboard
Copy a row to the clipboard
Paste a row from the clipboard

Cut, copy, and paste may be used within a transformer, or between transformers.

Filter

Start typing a string, and the matrix will only display rows matching those characters. Searches all columns. This only affects the display of attributes within the transformer - it does not alter which attributes are output.

Import

Import populates the table with a set of new attributes read from a dataset. Specific application varies between transformers.

Reset/Refresh

Generally resets the table to its initial state, and may provide additional options to remove invalid entries. Behavior varies between transformers.

Note: Not all tools are available in all transformers.

For more information, see Transformer Parameter Menu Options.

Reference

Processing Behavior	Feature-Based
Feature Holding	No
Dependencies	None
Aliases	RangeMapper
History

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

Source Attribute	The attribute to be matched against range(s).
Output Attribute	The name of the new attribute that is created as the result of the classification.