Elevation Dimension Settings
If the Construction Method you have chosen (in the Dimension Type and Font Panel of Linear Dimension Tool Settings) is Elevation Dimension, the options change accordingly.
The following describes the controls which are unique to Elevation Dimension Settings.
Marker Type: Click the pop-up to choose a Marker/Dimension text arrangement for the Elevation Dimension.
Choose a Dimension Origin from the pop-up list. The choices are:
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Sea Level (defined at Options > Project Preferences > Reference Levels)
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[1.25] Click this button to display an indicator (-) only with negative Dimension values.
[+ 1.25] Click this button to display an indicator (- or +) with all Dimension values.