[IFC Tunnel] [Geotechnics] Map "spatial" containers

[larswik]

MappedZone (FieldOutcrop, TunnelFace, TunnelWallArea, SlopeArea), TestedZone Input for TunnelWallArea:

Description from RAR: “All the registrations in the system are localized geometrically along the tunnel. The tunnel cross-section is developed (unfolded) so that the width of the registration plan corresponds to the arc length of the theoretical perimeter.” This way of describing and breaking down the tunnel “shell” is a typical way both for mapping geotechnical and geological observations and a way for describing where to apply certain types of built elements such as rock support measures, painting etc. Notes from meeting (@larswik , @SergejMuhic & Jan Erik Hoel) 2022-02-14): This does not seem to be a very exact science. Typically the “green lines” occur where the tunnel perimeter intersects a +/-45 degree plane (measured from the “tilted” floor). However, it seems important from both the geotechnics and construction side that these kinds of descriptions, where information is stored for each “cell” (above right) can be exchanged with IFC.

[larswik]

See also #359 and #360

[larswik]

Proposal:

• Map all MappedZone (FieldOutcrop, TunnelFace, TunnelWallArea, SlopeArea), TestedZone to PDTs for IfcSpatialZone
• The schematic representation presented above (developed description of inner tunnel surface) will need consideration. One possible solution:
  • Define spatial zones from and to chainage representing the "cells" and attach Psets to these zones. One question is then regarding what kind of shape representation these zones should have?

[anborr]

[larswik]

• Use IfcReferent
• IfcReferent has IfcLinearPlacement/IfcAxis2PlacementLinear
• IfcAxis2PlacementLinear.Axis defines the angle (angle + cant)
• An object, e.g. IfcLinearElement specifies a from/to IfcReferent
• IfcLinearElement can carry properties (see issue about GeotchTypicalSection)

EDIT: Specify derived attribute to get the axes of IfcAxis2PlacementLinear