How do I use a different datum for each coordinate system? AutoCAD Mechanical forces the first leader segment to be perpendicular to the attached object and the next segment to be horizontal or vertical. Specify the next point (vertex) on the leader. In the drawing area, select an object to attach the datum identifier to. Horizontal datums measure positions (latitude and longitude) on the surface of the Earth, while vertical datums are used to measure land elevations and water depths. There are two main datums in the United States. The Vertical Datum Transformation dialog box opens. In Toolspace, on the Toolbox tab, expand Miscellaneous Utilities Drawing Transformations and double-click Vertical Datum Transformation. Open a drawing with a defined coordinate system. Click Power Dimensioning tab Fit/Tolerance panel Method drop-down.
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