Units

In the software, a metric unit is always attached to a document.

You can set the default unit thanks to Unit settings. This unit will be automatically applied to new projects (or to former projects without unit).

When you import data, unit may be embedded in the file (this depends on the format): data will be scaled so as to fit your project according to its unit. Otherwise, you have to specify the unit at import.

Obviously, if the file embed the wrong unit, you will have to correct this with the command Resize.

List of known units

You can specify another unit, instead of default one, in many parameters.

Length

Area

Volume

Angle

µm

mm

cm

m

km

µin

mil

in

ft

usft

yd

mi

µm²

mm²

cm²

km²

µin²

mil²

in²

ft²

usft²

yd²

mi²

µm³

mm³

cm³

km³

µin³

mil³

in³

ft³

usft³

yd³

mi³

l

US liquid gallon

US dry gallon

US liquid barrel

US dry barrel

US oil barrel

rad

°

' (degree)

" (degree)

gon

% (tangent)


Units and result accuracy

The chosen unit affects result accuracy. Moreover, in some commands, very low input values could not be taken into account.

In this software, the resolution is 10-5:

Document unit

Resolution

mm

10nm

m

10μm

km

1cm

ft

0.00001ft (0.0254in or 3.048μm)

mi

0.00001mi (0.6336in or 1.609344cm)

Example: 2 adjacent points


Document unit: m

Document unit: km


point A

point B

point A

point B

X

650321.454

650321.450

650.321454

650.321450

Y

120789.123

120789.124

120.789123

120.789124

Z

256.788

256.786

0.256788

0.25679

0.256786

0.25679


points A and B are different

points A and B are equal

Globally, large units are not suitable for metrological purposes.