Split and Merge Rules dialog box

Use this dialog box to specify how class property values are calculated when you use the following commands on features.

• Split (MAPFEATURESPLIT)
• Merge (MAPFEATUREMERGE)
• Overlay
• JOIN (See JOIN in the AutoCAD Help)
• Join option of PEDIT (See PEDIT in the AutoCAD Help)
• BREAK (See BREAK in the AutoCAD Help)
• TRIM (See TRIM in the AutoCAD Help)

Feature Properties

Click a property to see its attributes and set its rules. Right-click a property to select multiple properties or property types. You cannot set rules for properties that are read-only.

Property Attributes

Attribute information for the selected property or properties.

Split and Merge Rules

Specifies how class property values will be calculated when features are split or merged.

Split Rule

Specify the rule for calculating class property values when you split features.

• Calculation. For numeric properties, set the property value based on a custom calculation specified in the Expression field.
• Copy. Copy the property values to each new feature. (Default)
• Divide. Divide the property values equally into each new feature. (Numeric properties only)
• Empty. Set the property values to “empty” or a default for new features. The original feature retains the original property values.
• Expression. Specify an expression.
• Proportional. Distribute the property values proportionally into each new feature based on the numeric value in the Based On field.

Expression

Specify a custom calculation. Enter the expression for the calculation, or click to use the Split Rule Expression dialog box.

This option is displayed when the Split Rule is set to Calculation or when the selected property is a string. For more information, see Overview of Expressions for Geospatial Features.

Based On

Specify the value the Proportional rule uses to distribute the property values.

This option is displayed when Split Rule is set to Proportional.

Merge Rule

Specify the rule for calculating class property values when you merge features.

• Average. Average the property values from the merged features. (Numeric properties only)
• Calculation. Set the property value based on a custom calculation specified in the Expression field.
• Concatenation. Join the values to form a single string separated by the text in the Separator Text field.
• Count. Gives the property the value of the total number of features merged to produce it. This option is for numeric values only.
• Empty. Set the property value to “empty” or a default for the merged feature.
• Expression. Specify an expression.
• First Selected. Use the value of the first selected feature.
• Last Selected. Use the value of the last selected feature.
• Maximum.Use the maximum property value of the merged features.
• Median. Use the median value of the merged features.
• Minimum. Use the minimum value of the merged features
• Standard Deviation. Use the standard deviation of the merged features.
• Sum. Use the sum of the values of the merged features.

Expression

Specify a custom expression. Enter the expression, or click to use the Split Rule Expression dialog box.

This option is displayed when the Merge Rule is set to Calculation or when the selected property is a string. For more information, see Overview of Expressions for Geospatial Features.

Separator Text

Specify the text that separates the property values when you select the Concatenation merge rule.