Abstract Class Name: Time Point

Superclass - Base Time Data

Subclasses

• Absolute Time Point
• Relative Time Point

Definition

A point in time at which a portion of the SEDRIS transmittal is valid (often used to indicate the time a measurement was made - a timestamp).

Primary Page in DRM Diagram:

• 20

Example

1. The date and time when a SEDRIS transmittal was created.

FAQs

What is the purpose of this class?

This class provides 1) FGDC-compatible metadata that describes the point in time when a high-level SEDRIS object (e.g. Transmittal Root, Model, Image, etc.) was created, and 2) a general-purpose mechanism for describing points in time. It allows potential users of a SEDRIS transmittal to evaluate the age of a transmittal, without necessarily having to obtain or examine the transmittal itself.

When would I use Relative Time Point vs. Absolute Time Point?

The Absolute Time Point always represents a GMT time. Relative Time Point can be used to represent alternate time references, such as simulation time or Julian dates.

Constraints

Component of (one-way)(inherited)

• optionally, some Base Time Constraints Data
• optionally, some Environment Roots
• optionally, a Transmittal Root

Component of (one-way)

• optionally, some Citations
• optionally, some Process

Inherited Field Elements

Notes

Fields Notes

time_significance

 Used to indicate the significance of the time information