ArcObjects Library Reference (System)

DefinedInterval CoClass

Defines a defined interval classification method.

Product Availability

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.

Description

The DefinedInterval coclass represents a defined interval classification; this divides a set of attribute values into classes that are divided by precise numeric increments, such as 10, 100, or 500.

This classification works well for values that people are accustomed to seeing in rounded numbers, such as age distribution, income level, or elevation ranges. The disadvantage is that some of the classes, particularly the first and last, may contain a disproportionate number of values.

Set up the data values with IClassify::SetHistogramData then use the IIntervalRange interface to retrieve a default interval or to set a different interval. This would typically be the maximum data value divided by five, so by default you will have five classes. To override this, set a different interval into the IntervalRange property. When you are calling IClassify::Classify, the number of classes returned depends on the maximum data value divided by the interval.

Supported Platforms

Windows, Solaris, Linux

Interfaces

Interfaces	Description
IClassify	Provides access to members that control the classification methods.
IClassifyGEN	Provides access to members that control classification.
IClassifyMinMax	Provides access to members that control the classification methods that require only a minimum and maximum value to classify.
IClassifyMinMax2	Provides access to members that control the classification methods that require a data range only.
IIntervalRange	Provides access to members that control classifications that need an interval range.
IIntervalRange2	Provides access to members that control classifications that need an interval range.