This defines the height above ground level of a feature (heightAboveGroundLevel attribute) and defines the accuracy of this, where known (accuracyOfHeightAboveGroundLevel attribute). This attribute is only present in the Topographic Line and the Topographic Point Feature Types.
Height of the feature above ground level, in metres. Forms part of the heightAboveGroundLevel complex attribute.
Attribute Name: heightAboveGroundLevel
Type: Real
Multiplicity: [1]
The accuracy of the vertical position in metres at the 95% confidence level. Forms part of the heightAboveGroundLevel complex attribute.
Attribute Name: accuracyOfHeightAboveGroundLevel
Type: String
Multiplicity: [1]
A complex attribute is an attribute that consists of two or more simple attributes that go together to convey some composite information about a feature. They only exist within the GML format.
Further information on complex attributes in OS MasterMap Topography Layer is detailed in the following sub-pages.
Information about the change history of a feature that comprises the reason for the change (reasonForChange attribute) and the date for this change (changeDate attribute). Each feature may have numerous change history records and these are ordered chronologically in the attribute. This attribute is present in all six feature types.
The reason for a change made to a feature. Forms part of the feature’s complex attribute, changeHistory.
Attribute Name: reasonForChange
Type: String
Multiplicity: [1]
The date a change was made to the feature by an editor. Forms part of the feature’s complex attribute, changeHistory.
This may not match the versionDate attribute.
Attribute Name: changeDate
Type: String
Multiplicity: [1]
This contains information about the height above Ordnance Datum Newlyn (ODN; heightAboveDatum attribute) and, where known, the accuracy of this value (accuracyOfHeightAboveDatum attribute). This attribute is only present in the Topographic Line and the Topographic Point Feature Types.
The height of the feature above the ODN vertical datum, in metres. Forms part of the heightAboveDatum complex attribute.
Attribute Name: heightAboveDatum
Type: Real
Multiplicity: [1]
The accuracy of the vertical position in metres at the 95% confidence level. Forms part of the heightAboveDatum complex attribute.
Attribute Name: accuracyOfHeightAboveDatum
Type: String
Multiplicity: [1]
Provides the information to graphically display a text string in harmony with the underlying map detail and consists of anchorPosition, font, height and orientation attributes. This attribute is only present in the Cartographic Text Feature Type.
A number between 0 and 8 that specifies which part of the text is bound to the anchorPoint. Forms part of the feature’s complex attribute, textRendering.
Attribute Name: anchorPosition
Type: Integer
Multiplicity: [1]
A value of 0, 1, 2 or 3 that can be used as a basis for determining which font to use when displaying the text. For example, a user application could associate Verdana with 2 to display all text with a font of 2 in Verdana. Forms part of the feature’s complex attribute, textRendering.
Attribute Name: font
Type: Integer
Multiplicity: [1]
The height of CartographicText. The height is expressed as the distance on the ground covered by the text, in metres. Forms part of the feature’s complex attribute, textRendering.
Attribute Name: height
Type: Measure
Multiplicity: [1]
The orientation of text for cartographic placement. Given in tenths of a degree anticlockwise from due east (0–3599). Forms part of the feature’s complex attribute, textRendering.
Attribute Name: orientation
Type: Integer
Multiplicity: [1]
