Identifier: units

Type

string

Description

The current modeling units. All point values and graphic co-ordinates are assumed to be measured in the units value. It may be reassigned with one of the following values:

Metric
mm	Millimeters
cm	Centimeters
dm	Decimeters
m	Meters
dc	Decameters
hc	Hectometers
km	Kilometers
Spherical
ll	111 km (for schematic degree use)
Imperial
in	Inches
ft	Feet
yd	Yards
mi	Miles
Nautical
gnm	Geographic nautical miles
anm	Admiralty nautical miles
inm	International nautical miles

At system startup, the modeling units are "mm".

Changing the value of units will not automatically re-scale entities in the graphic database. This must be done manually.

When combined with cartographic projections, there are restrictions applied to the current value of modeling units. While the current projection (defined by the projection identifier mapping) is a Cartesian projection the value of units cannot be the degrees value ("ll"), but can be any other. While mapping is a Long/Lat projection, e.g. ll_proj, the value of units is forced to "ll" and cannot be changed. Switching between Long/Lat and Cartesian projections (by changing the value of mapping) automatically switches the value of units between "ll" and its last non-"ll" value.

See Also

Functions:	uconv
Identifiers:	ll_proj (projection), mapping (projection), utom (numeric)