

Informal description of this coordinate reference system. It should then be qualified by the EPSG name space, for example as 'EPSG:5555'. NOTE The name shall be taken from the list recognized by the European Petroleum Survey Group EPSG. Name by which the coordinate reference system is identified.
#Geodetic datum software#
Software used to transport IFC engineering models into GIS applications (and vice versa) is expected to have knowledge about the OGC Implementation Specifications. NOTE One widely-used, publicly-available authority is the European Petroleum Survey Group (EPSG), and use of this authority is currently specified in several OGC Implementation Specifications. 'EPSG:5555' defined the geodetic datum 'ETRS89' and the vertical datum 'DHHN92'. In these cases the GeodeticDatum and the VerticalDatum can be omitted.ĮXAMPLE The identifier 'EPSG:25832' defines the geodetic datum 'ETRS89' in additon to the projection and the zone. Well defined identifiers include the geodetic and often also the vertical datum. The unambiguous identifier by which the coordinate reference system is know, is stored in the Name attribute. The resulting combination of coordinate system and datum is a coordinate reference system. The datum specifies the relationship of a coordinate system to the earth. The coordinate system is composed of a set of coordinate axes with specified units of measure. NOTE Definition from OpenGIS Abstract Specification, Topic 2:Ī coordinate reference system is a coordinate system which is related to the real world by a datum. The interpretation of the identifier is expected to be well-known to the receiving software. The IfcCoordinateReferenceSystem is a definition of a coordinate reference system by means of qualified identifiers only. Semantic definitions at the entity Entity definition IfcCoordinateReferenceSystem IfcCoordinateReferenceSystem Natural language names
