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Data Exchange Standards

The following information supplements PDDM Section 9.6.6.4

Data Exchange Standards

There are numerous software products used in construction. These may have proprietary design formats not universally supported by the CADD software used to prepare the 3D model. The most widely used exchange format is LandXML; however, LandXML is not consistently supported by different software applications, particularly for pipe networks, surfaces and cross sections. The provided construction model should include a combination of 3D data in the data exchange format and in a DGN graphics or i-Model format. When producing LandXML outputs for surfaces, include both triangles and features in the surface definition. If these are excluded, the receiving software will re-triangulate the surface, which may not reflect the design intent.

Data types and acceptable exchange format data types for FLH projects are shown below:

Exhibit 9.6.6.4A-1: Data Exchange Standards
Data TypeData FormatsMetadata
Coordinate GeometryDGN
ASCII Text
Survey metadata embedded in DGN and/or in a Design Narrative/PE Memo in the folder
AlignmentsLandXML
i‑Model
ASCII Text Reports
DGN Superelevation Tables
XML Superelevation Report
Survey metadata embedded in LandXML or i-Model and/or in a Design Narrative/PE Memo in the folder.
List of file names and description of content, including plan sheets and related surfaces, if applicable.
Original SurfacesLandXML
i‑Model or TIN/DTM
DGN Triangle Faces & Boundary
DGN or i‑Model Points & 3D Line Strings
Survey metadata embedded in LandXML or i-Model and/or in a Design Narrative/PE Memo in the folder.
Final SurfacesLandXML
i‑Model or TIN/DTM
DGN Triangle Faces & Boundary
DGN or i‑Model Points & 3D Line Strings
Survey metadata embedded in LandXML or i-Model and/or in a Design Narrative/PE Memo in the folder.
List of file names and description of content, including related alignments, if applicable.
Interim SurfacesLandXML
i‑Model or TIN/DTM
DGN Triangle Faces & Boundary
DGN or i‑Model Points & 3D Line Strings
Survey metadata embedded in LandXML or i-Model and/or in a Design Narrative/PE Memo in the folder.
List of file names and description of content, including related alignments, if applicable.
3D Line StringsLandXML (Surface Features)
DGN Graphics (3D Line Strings)
Survey metadata embedded LandXML and/or in a Design Narrative/PE Memo in the folder.
List of file names and description of content, including related alignments and surfaces, if applicable
3D Solid ModelsDGN GraphicsSurvey metadata embedded in DGN and/or in a Design Narrative/PE Memo in the folder.
List of file names and description of content, including related alignments and surfaces, if applicable
Cross SectionsLandXML
DGN Graphics (2D Lines & Text)
Survey metadata embedded in DGN and/or in a Design Narrative/PE Memo in the folder.
List of file names and description of content, including related alignments and surfaces.
Corridor Modelsi‑Model
CAD Graphics (3D solids/components)
Survey metadata embedded in i-Model or DGN and/or in a Design Narrative/PE Memo in the folder.

Submit data with a transmittal letter listing all files as described in Level of Detail and in the Construction Manual. The transmittal letter documents the level of detail for the data provided. Also include a list of any expectations and the intended uses of the data. (e.g. If the data was developed only for the purpose of creating plans, it may not be intended for use in AMG or inspection as it may not have sufficient density to accurately depict the design intent.)

Updated: Monday, March 28, 2022