12.17.1 AbstractWellLocation

Topic Version	1	Published	11/11/2016	Topic Change History
For Standard	WITSML v2.0
Type:	Class		Stereotype:	«XSDcomplexType»

Location Schema. This is a location that is expressed in terms of 2D coordinates. So that the location can be understood, the coordinate reference system (CRS) must be known. The survey location is given by a pair of tagged values. The pairs may be: (1) latitude/longitude, (2) easting/northing, (3) westing/southing, (4) projectedX/projectedY, or (5) localX/localY. The appropriate pair must be chosen for the data.

Table 12.17.1-1 Attributes
Name	Type	Notes
Description	String2000	A comment, generally given to help the reader interpret the coordinates if the CRS and the chosen pair do not make them clear.
ExtensionNameValue	ExtensionNameValue	Extensions to the schema based on a name-value construct.
Original	boolean	Flag indicating (if that Is this pair of values the original data given for the location? Values are "true" or "1". Or, if the pair of values was calculated from an original pair of values, set to "false" (or "0") or leave blank.
uid	String64	A unique identifier for a well location.

Table 12.17.1-2 Associations
Association	Notes
From: TrajectoryStation.Location 0..*To: AbstractWellLocation Association	The 2D coordinates of the item. Note that within the context of trajectory, the "original" coordinates are inherently local coordinates as defined above.
From: TargetSection.Location 0..*To: AbstractWellLocation Association	The 2D coordinates of the item at the start of the section. This is redundant information and can be computed by starting at the section origin and applying the sequence of angleArcs and lenRadius.
From: ProjectedWellLocation. To: AbstractWellLocation Generalization
From: Target.Location 0..*To: AbstractWellLocation Association	The 2D coordinates of the item at the start of the section. The location object is mandatory for the first section starting point.
From: Well.WellLocation 0..*To: AbstractWellLocation Association	Additional 2D coordinates of the well surface point in one or more coordinate reference systems. This is where the well crosses ground level on land and crosses the platform offshore.
From: ReferencePoint.Location 1..*To: AbstractWellLocation Association	Two dimensional coordinates that locate the point.
From: GeodeticWellLocation. To: AbstractWellLocation Generalization
From: WellDatum.HorizontalLocation 0..1To: AbstractWellLocation Association	The horizontal location of the point being used as a well datum. This may be used when the point is not directly above or below the well point location. For example, a well being drilled from a platform may have its location at the entrance into the sea floor, while the well datum may be located on the drilling rig. Or the well datum may be a kickoff point, that is not directly under the well surface point.
From: DrillReportSurveyStation.Location 0..*To: AbstractWellLocation Association	The 2D coordinates of the item. Note that within the context of trajectory, the "original" coordinates are inherently local coordinates as defined above.