ISO 10303-214:2010(E)
A Cartesian_coordinate_space is a coordinate space in which geometric and annotation elements may be defined. It is either two-dimensional or three-dimensional. An origin for coordinate values is implicitly defined. The units applicable to the coordinate values of elements defined in the Cartesian_coordinate_space are specified.
NOTE 1 Cartesian Transformation objects are used to specify the relationships between coordinate spaces.
Each Cartesian_coordinate_space is a Cartesian_coordinate_space_3d or a Cartesian_coordinate_space_2d.
The data associated with a Cartesian_coordinate_space are the following:
unit_of_values
The unit_of_values specifies the various units in which any values are expressed. In the case where geometric elements are defined in the Cartesian_coordinate_space, there shall be at least two units specified, the length unit and the plane angle unit. The same length unit is applied to each coordinate direction. Only one unit of a kind shall be specified.
The unit_of_values need not be specified only if the Cartesian_coordinate_space belongs to an External_model.
NOTE 2 If elements with different units are required, they have to be separated into different models with their own Cartesian_coordinate_space
EXAMPLE A length measure unit measured in inches and an angle measure unit measured in degrees are examples for two members of the attribute unit_of_values assigned to the same Cartesian_coordinate_space.
See Cartesian_coordinate_space to unit for the application assertion.
The unit_of_values need not be specified for a particular Cartesian_coordinate_space.
© ISO 2010 — All rights reserved