POSC Specifications: Epicentre Version 3.0 | Logical Data Model |
An indication of the prevailing sea state at one particular location on the sea surface. There are two main components to the sea state, swell and waves. The swell is defined as the long, often massive crestless waves which are a product of a far off cause (as a gale). A wave is associated with the smaller often crested variety which are a product of the local weather conditions.
- end_time (O, K, I: ndt_date_tod)
- The date and time of day designated as the end of the valid or effective time interval over which the property applies. Inherited from pty_transient_property.
- ref_transient_period (O, K, I: ref_transient_period(pty_transient_property)) (C138)
- The type of period over which the property applies, such as day, month, quarter, cumulative, etc. Each pty_sea_state may represent a period of one ref_transient_period. Inherited from pty_transient_property.
- start_time (O, K, I: ndt_date_tod)
- The date and time of day that designated the start of the valid or effective time interval over which the property applies. Inherited from pty_transient_property.
- platform (O, K: platform(pty_sea_state))
- Each pty_sea_state may be a property of one platform.
- activity (O, K, I: activity(process_data))
- Defines the activity which created this instance. Each pty_sea_state may be the result of one activity. Inherited from process_data.
- potential_field_platform (O, K: potential_field_platform(pty_sea_state))
- Each pty_sea_state may be a property of one potential_field_platform.
- description (O, I: ndt_comment) (C117)
- A remark or comment about the instance. Inherited from e_and_p_data.
- instance_create_date (O, I: ndt_date_tod) (C126)
- This is the date that this instance was created. This date is defined by the source if imported, or is the date the instance is created if a new instance. Inherited from e_and_p_data.
- instance_creator (O, I: ndt_identifier) (C126)
- This is the person, company or application that created this instance. This identifies the party responsible for loading this instance. Inherited from e_and_p_data.
- last_updated (O, I: ndt_date_tod) (C126)
- This is the date that this instance was last updated. This value should be updated when any part of this instance is altered (except for inverse relationships). Inherited from e_and_p_data.
- last_updated_by (O, I: ndt_identifier) (C126)
- This records the person or application making the update to this instance. Inherited from e_and_p_data.
- preferred_flag (O, I: ndt_boolean)
- The flag is set to True if this instance of property is the preferred value in this data store of this type of property for the object which this property describes. Inherited from property.
- source (O, I: ndt_identifier) (C126)
- The provider of this instance, which is usually a data provider for imported/purchased data. If this instance is provided by POSC, then this attribute must be "POSC". Inherited from e_and_p_data.
- swell_azimuth (O: ndt_azimuth)
- The direction from which the swell emanates - expressed as an azimuth.
- swell_height (O: ndt_length)
- The height of the swell.
- swell_period (O: ndt_time_second)
- The time which expires between the passing of two swell tops.
- wave_azimuth (O: ndt_azimuth)
- The direction from which the waves are coming - expressed as an azimuth.
- wave_height (O: ndt_length)
- The height of the waves.
- wave_period (O: ndt_time_second)
- The time which expires between the passing of two wave tops.
- data_collection (I, V: SET[0:?] data_collection_content(collection_part)) (C020)
- Indicates the data collections that include this instance of E and P data. Each pty_sea_state may be a member of one or more data_collection_content. Inherited from e_and_p_data.
- document_information_content (I, V: SET[0:?] document_information_content(e_and_p_data)) (C136)
- These are the document specification parts that include this data value and define its meaning within a document specification. Each use may define a different meaning, and many uses are allowed. Each pty_sea_state may be included in one or more document_information_content. Inherited from e_and_p_data.
- graphical_element (I, V: SET[0:?] graphical_element(depicted_object))
- Specifies one or more graphical elements which are depicting this data item. Each pty_sea_state may be depicted by one or more graphical_element. Inherited from e_and_p_data.
- process_data_item (I, V: SET[0:?] process_data_item(process_data))
- Defines where this data was used by an activity. Each pty_sea_state may be the value for one or more process_data_item. Inherited from process_data.
- ref_north_axis_direction (O: ref_north_axis_direction(pty_sea_state)) (C150)
- The meaning of North, e.g., true or magnetic. This is the direction from which an angular offset was measured. Each pty_sea_state may have an orientation relative to one ref_north_axis_direction.
- represent (O, I: property(representations)) (C125)
- This is the property that is the original for which this representation is an equivalent representation. Each pty_sea_state may be an equivalent representation of one property. Inherited from property.
- representations (I, V: SET[0:?] property(represent)) (C125)
- This designates other properties that are stated to be equivalent representations of this property representation, such as the same geometry using another coordinate system. Each pty_sea_state may have as equivalent representations one or more property. Inherited from property.
- swell_compass_direction (O: ref_compass_point(sea_state_swell))
- The direction from which the swell emanates - expressed by the use of a compass point. Each pty_sea_state may swell compass direction one ref_compass_point.
- wave_compass_direction (O: ref_compass_point(sea_state_wave))
- The direction from which the waves are coming - expressed by the use of a compass point. Each pty_sea_state may wave compass direction one ref_compass_point.
Local rules:
- Uniqueness Constraint (C010, C149)
- end_time, ref_transient_period, start_time, platform, activity, potential_field_platform
- [I: property] Mandatory Relationship Set
-
Each PROPERTY must "be a property of" one object.
- [I: pty_transient_property] Instance Value Constraint (C050)
-
If REF_PERIOD_TYPE is EVENT, then both START_TIME and END_TIME must either be blank or be identical.
- [I: pty_transient_property] Instance Value Constraint (C050)
-
If REF_TRANSIENT_PERIOD is either YEAR TO DATE, MONTH TO DATE or CUMULATIVE, then END_TIME must be instantiated.
- [I: pty_transient_property] Instance Value Constraint (C050)
-
If REF_TRANSIENT_PERIOD is ANNUAL, SEMIANNUAL, QUARTER, MONTHLY, DAILY, or HOURLY, then either both START_TIME and END_TIME are blank or both must be instantiated.
Supertype path(s):
Entity projects as table P_SEA_STATE.
Generated on Tue Jul 10 15:50:22 2001
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