Class Name: Absolute Time Interval

Superclass - Time Interval

Definition

An interval of time defined by an absolute (GMT) start time and an absolute stop time.

Primary Page in DRM Diagram:

• 20

Example

1. The time period for which a SEDRIS transmittal should be considered to be valid. The stop time can be considered to be an "expiration date".

FAQs

What is the purpose of this class?

This class provides a means to specify a time interval in terms of absolute GMT times. The time interval is used to specify FGDC-compatible metadata that describes the time period within which a high-level SEDRIS object (e.g. Transmittal Root, Model, Image, etc.) and as a general-purpose mechanism for describing time intervals. Absolute Time Interval allows potential users of a SEDRIS transmittal to evaluate the time period covered by the transmittal or object, without necessarily having to actually obtain or examine the transmittal or object directly.

How do I specify the time interval?

An Absolute Time Interval contains an Absolute Time Point that indicates the start of the time interval and the class fields indicate the length of the interval.

Constraints

• Legal Time Ranges
• Time Dependency
• Time Interval Calculation

Composed of (one-way)

• one Absolute Time Point (notes)

Component of (one-way)(inherited)

• optionally, some Base Time Constraints Data
• optionally, some Environment Roots
• optionally, a Transmittal Root
• optionally, some Months
• optionally, some Seasons
• optionally, some Sound Instances
• optionally, some Sources

Inherited Field Elements

Field Elements

Notes

Composed of Notes

Absolute_Time_Point

 the start of the <Absolute Time Interval>

Fields Notes

time_significance

 Used to indicate the significance of the time information

delta_hours

 Must be between 0 and 23

delta_minutes

 Must be between 0 and 59

delta_seconds

 fractions provide higher accuracy if needed, e.g. milliseconds
 Must be between 0.0 and 59.0