Class Name: Relative Time Interval

Superclass - Time Interval

Definition

An interval of time, defined by a start time and a stop time that are relative to another 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 times relative to another time. 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. Relative 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 a time interval relative to start of simulation?

Do not include the component Absolute Time Point. If there is no component Absolute Time Point then the deltas are relative to simulation start.

Constraints

• Legal Time Ranges
• Time Dependency
• Time Interval Calculation

Composed of (one-way)

• optionally, an 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

 If present, the Time_Interval is relative to an absolute time
 Otherwise, the Time_Interval is relative to simulation start

Fields Notes

time_significance

 Used to indicate the significance of the time information

delta_start_hours

 Must be between 0 and 23

delta_stop_hours

 Must be between 0 and 23

delta_start_minutes

 Must be between 0 and 59

delta_stop_minutes

 Must be between 0 and 59

delta_start_seconds

 Must be between 0.0 and 59.0

delta_stop_seconds

 Must be between 0.0 and 59.0