Class

• <DRM Irregular Axis>

Superclass

• <DRM Axis>

Subclass

• None.

Definition

An instance of this DRM class is an <DRM Axis> instance that does not use a constant spacing between hash marks.

The axis_value_array field specifies the “tick mark” values, which shall be arranged in ascending order.

The value_unit field specifies the unit of measurement of the given <DRM Irregular_Axis> instance, which shall be compatible with the requirements imposed by its axis_type value.

If the specified axis_type does not require a unit of measurement, value_unit shall be set to EUC_UNITLESS.

The value_scale field specifies the scale applicable to value_unit.

If the specified axis_type does not require a scale of measurement, value_scale shall be set to ESC_UNI.

The value of the interpolation_type field allows the data provider to indicate how best to interpolate the data to points that are between grid points on the axis represented by the given <DRM Irregular Axis> instance. Note that when a <DRM Data Table> instance has more than one <DRM Irregular Axis> component, the order of the interpolations follows the order of the <DRM Irregular Axis> components.

Class diagram

Figure 6.142 — DRM_Irregular_Axis

Constraints

• Axis type restrictions
• Publishable Object

Example(s)

• Data taken at times 1, 2, 5, 10, 50, and 100 seconds after some start time would be collected on an <DRM Irregular Axis> instance.

• Radiosonde data, including temperature, humidity, wind speed, and wind direction, is generally reported as a function of pressure height. Data are reported only when there is a significant change in one of the dependent variables. Accordingly, the pressure heights are captured at unpredictable, irregular intervals. They are best captured in an <DRM Irregular Axis> instance.