Enabling use of the current z-value (Production Mapping)
The Update Z values on modify check box controls whether a vertex's z-value is updated to the current z-value when the vertex is modified. When this check box is checked, z-values on any modified vertices are updated to the current z-value at the time the edits are made. In contrast, if the Update Z values on modify check box is unchecked, existing z-values are retained, and the current z-value is ignored when a vertex is modified.
In the example below, if the Update Z values on modify check box is checked and you move vertex 1, the z-value will update from 27.275 to 20.
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| Example of a feature updated using the current z-value | 
If that same edit is performed when the Update Z values on modify check box is not checked, the z-value for vertex 1 remains unchanged at 27.275.
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| Example of a vertex that retains the original z-value when moved | 
By default, the Update Z values on modify check box is checked.
- Start ArcMap.
- On the main menu, click Customize > Toolbars > Production Editing.
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On the Production Editing toolbar, click  Production Editing > Editing Properties. 
The Production Properties dialog box appears.   提示: 提示:You can also open the Production Properties dialog box by clicking Customize > Production > Production Properties. 
- Check the Update Z values on modify check box in the Z Management area.
- 单击确定。