Available with Production Mapping license.
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.
![A current z-value specified on the Production Z Management toolbar A current z-value specified on the Production Z Management toolbar](GUID-E001F5DA-49F3-41E2-B95B-73A7662D4A76-web.png)
![Example of a feature updated using the current z-value Example of a feature updated using the current z-value](GUID-93B3F1DE-3851-47B7-BEA9-AA28DB9C33F9-web.png)
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.
![Example of a vertex that retains the original z-value when moved Example of a vertex that retains the original z-value when moved](GUID-7783AD81-9565-4093-8A2A-E9D0C5EC2FAE-web.png)
By default, the Update Z values on modify check box is checked.
- Start ArcMap.
- On the main menu, click Customize > Toolbars > Production Editing.
- On the Production Editing toolbar, click Production Editing > Editing Properties.
The Production Properties dialog box appears.
- Check the Update Z values on modify check box in the Z Management area.
- Click OK.