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Measurements in ILIUM

You can register how many measurements are necessary for the description of a S.U. or a Material.
Measurements can be of different types, can be taken in different positions, can be in different units...
When the user selects this tab, an "add" icon appears in the toolbar. By selecting it, a new measurement can be introduced, filling a special form that has several fields:

Standard attributes and values for measurements:

- Type: Elevation above sea level, Height, Width, Length, Weight, Diameter, Radius, Granulometry.
- Subtype: Minimum, Maximum, Mean
- Position: Medial, Upper, Lower, Other
- Units: M, Cm, Mm, Kg, Gr

This system allows to store more than one type of measurement for each element (S.U. or Material): for example, it can have two different values for height (measured at different points).

Examples: A wall can have a minimum height, corresponding to the portion conserved or visible (Height min.); a hole can have a maximum diameter, measured next to the opening (Diam. max. upper) and a minimum diameter measured at its bottom (Diam. min. lower).
The type ``Elevation (above sea level)'' has to be always ``upper'' or ``lower''. You can use more than one ``upper elevation'' and more than one ``lower elevation'', for example, when a layer has dip.