POSC Specifications: Epicentre Version 3.0 | Relational Implementation |
A structured, multi-dimensional grid which is composed of a list of grids of lower dimensionality. For example, a 3D grid may be composed of a list of three 1D grids, or it may be composed of a list of a 2D grid and a 1D grid.
- instance_s (PK, M: CHAR VARYING(19))
- Surrogate key of the table.
- identifier (M: CHAR VARYING(80))
- grid_or_mesh.identifier
The name or identifier of this grid.
- instance_create_date (O: TIMESTAMP)
- e_and_p_data.instance_create_date
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.
- last_updated (O: TIMESTAMP)
- e_and_p_data.last_updated
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).
- description (O: CHAR VARYING(2000))
- e_and_p_data.description
A remark or comment about the instance.
- instance_creator (O: CHAR VARYING(80))
- e_and_p_data.instance_creator
This is the person, company or application that created this instance. This identifies the party responsible for loading this instance.
- last_updated_by (O: CHAR VARYING(80))
- e_and_p_data.last_updated_by
This records the person or application making the update to this instance.
- missing_element_sl (O: CHAR VARYING(16))
- grid_structured.missing_element
This indicates the missing elements of the structured grid. Missing elements are excluded from the grid and cannot be assigned properties. The highest order of elements allowed in the grid must be used (i.e., cells in a 3D grid). For grids composed of other grids, the behavior is cumulative with the composed grid inheriting the behavior of the component grids. For example, in seismic, a 2D binset grid may have missing elements such that the grid is "L" shaped. If a 3D grid (cube) is formed using the 2D binset grid and a 1D vertical time grid then the "columns" of the cube should be considered missing.
- source (O: CHAR VARYING(80))
- e_and_p_data.source
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".
Table is related to: geophysical_processing_grid, data_collection_content, derived_interest_makeup, document_specification_part, @graphical_element, grid_composition, grid_modification, object_activity_involvement, geophysical_geometry_set
Primary Key Constraint on: INSTANCE_S
Fully implemented Unique Constraint on: IDENTIFIER
Generated on Tue Jul 10 16:36:03 2001
© Copyright 2001 POSC. All rights reserved.