Building Height Attribute
Feature type attributes
OS_TOPO_TOID
Unique feature identifier of the topographicArea building polygon taken from OS MasterMap Topography Layer.
Type: CharacterString
Length: 20
Multiplicity: [1]
OS_TOPO_TOID_VERSION
The version number of the TOID for which the height values have been calculated.
Type: Integer
Length: 3
Multiplicity: [1]
BHA_ProcessDate
The date that the Building Height Attribute values were calculated for the given OS_TOPO_TOID. Dates will follow the structure YYYY-MM-DD.
Type: Date
Length: 10
Multiplicity: [1]
TileRef
The 5km² tile reference within which the Building Height Attribute is located.
Type: CharacterString
Length: 6
Multiplicity: [1]
AbsHMin
AbsHMin is the absolute minimum height of the intersection of the external building walls and the underlying ground surface.
Type: Real
Length: 4.1
Multiplicity: [1]
AbsH2
AbsH2 is the absolute height of the base of the roof, that is, where the roof intersects the principal part of the building. The principal part of the building is defined as the main structure.
Type: Real
Length: 4.1
Multiplicity: [0..1]
AbsHMax
AbsHMax is the absolute height of the highest point on the building and can include any structure, such as chimneys, plant housings and machinery.
Type: Real
Length: 4.1
Multiplicity: [0..1]
RelH2
RelH2 = AbsH2 – AbsHMin. RelH2 is the relative building height from the base of the building (AbsHMin) to the height of the base of the roof (AbsH2).
Type: Real
Length: 4.1
Multiplicity: [0..1]
RelHMax
RelHMax = AbsHMax – AbsHMin. RelHMax is the relative building height from the base of the building (AbsHMin) to the height of the highest point on the building (AbsHMax).
Type: Real
Length: 4.1
Multiplicity: [0..1]
BHA_Conf
A qualitative assessment of the confidence of the height statistics for each topographicArea building polygon.
Type: BHA_ConfValue
Length: 2
Multiplicity: [1]
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