12.17.20 WellElevationCoord

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

A vertical (gravity-based) elevation coordinate within the context of a well. Positive moving upward from the reference datum. All coordinates with the same datum (and same UOM) can be considered to be in the same coordinate reference system (CRS) and are thus directly comparable.

Table 12.17.20-1 Attributes
Name	Type	Notes
datum	String64	Defines the vertical datums associated with elevation, vertical depth, and measured depth coordinates.
uom	LengthUom	The unit of measure by which the datum is expressed.

Table 12.17.20-2 Associations
Association	Notes
From: WellElevationCoord. To: AbstractMeasure Generalization
From: Well.WellheadElevation 0..1To: WellElevationCoord Association	Elevation of wellhead relative to a wellDatum.
From: DrillReportStatusInfo.ElevKelly 0..1To: WellElevationCoord Association	Elevation of the rotary kelly bushing.
From: Well.GroundElevation 0..1To: WellElevationCoord Association	Elevation of ground level (land rigs).
From: WellDatum.Elevation 0..1To: WellElevationCoord Association	The gravity based elevation coordinate of this reference datum as measured from another datum. Positive moving upward from the elevation datum. An elevation should be given unless this is a vertical reference datum (e.g., sea level).
From: ReferencePoint.Elevation 0..1To: WellElevationCoord Association	The gravity based elevation coordinate of this point as measured from a datum. Positive moving upward from the elevation datum.