Shape updates

The Value Method field in the DynamicValue table defines the actions that occur when the Attribute Assistant is enabled and features are modified or created in ArcMap. Four fields in the DynamicValue table (Value Method, Table Name, Field Name, and Value Info) must be configured to use an Attribute Assistant method. The remaining fields define when the Attribute Assistant method should be applied.

The following two Attribute Assistant methods can be configured in your DynamicValue table:

Method	Description
Length	Calculates the length of line features and the area of polygon features.
Set Measures	Populates the m-coordinates of line features. M-values can be used to add route events to point and line events dynamically along line features.

Length

Calculates the length of line features and the area of polygon features.

To configure this method, populate the following in the DynamicValue table:

Table Name	Field Name	Value Method	Value Info
Feature class	The field to store the measurement	LENGTH	{Geodesic}

This rule can only be configured on line and polygon feature classes, and the length value must be populated in Floating or Double fields.

Parameters

The method parameters are as follows:

Parameter	Value	Description
Geodesic (Optional)	`<Null>` (Default)	Calculates the length/area in database units, using planar measurements.
	False	Calculates the length/area in database units, using planar measurements.
	True	Calculates the length/area in database units, using geodesic measurements (true shape).

Examples

Calculates the length of a line in the wLateralLine layer and stores in the LENGTH field:

Table Name: wLateralLine
Field Name: LENGTH
Value Info: <Null>

Calculates the geodesic or true length of a line:

Table Name: wLateralLine
Field Name: LENGTH
Value Info: True

Calculates the geodesic or true area of a polygon in the AreaOfInterest layer and stores in the AREA field:

Table Name: AreaOfInterest
Field Name: AREA
Value Info: True

Set Measures

Populates the m-coordinates of line features. M-values can be used to add route events to point and line events dynamically along line features.

To configure this method, populate the following in the DynamicValue table:

Table Name	Field Name	Value Method	Value Info
Feature class with m-values enabled		SET_MEASURES	{Type}

This rule can only be configured on Floating or Double fields.

Parameters

The method parameters are as follows:

Parameter	Value	Description
Type (Optional)	Blank (Default)	Calculates m-values from zero to the length of the line in map units.
Type (Optional)	P	Calculates m-values as a percentage of the length of the line (0–100%).

Examples

Calculates the m-values in the wLateralLine layer in map units:

Table Name: wLateralLine
Field Name: M_VALUE
Value Info: <Null>

Calculates the m-values as a percentage:

Table Name: wLateralLine
Field Name: M_VALUE
Value Info: P