3.1 Scope
This standard outlines the requirements for the delivery of Computer Aided Design (CAD) files to the Maryland Aviation Administration (MDOT MAA) by its consultants. This standard establishes standard layers, title blocks, file names, line types and other conventions to be applied to all CAD files delivered to, used by, or developed by MDOT MAA. This standard does not define design and drafting procedures for consultants to follow when developing files that are compliant with this standard, but does provide requirements that must be met in the resulting product. This standard also covers standard naming, object properties, delivery format and plotting. Standard naming and delivery format will allow for efficient storage and retrieval of files. Standard layer naming facilitates sharing of information between drawings and better control of drawing objects. Standard object properties will help provide uniform appearance to CAD drawings. Standard plot settings will help overcome problems associated with producing similar looking plots from different plotters.
Consultants are required to follow these standards. MDOT MAA will utilize the CAD deliverables to extract valuable information to update MDOT MAA AIRPortal GIS database.
3.1.1 Standard Definition
MDOT MAA has implemented a series of standards, applications, policies, procedures and a spatial data repository. These serve as a central catalog and repository for engineering information used by MDOT MAA. This data is used within applications as well as other MDOT MAA systems that require this type of data. It also provides a structured workflow and a means of cataloging, archiving and retrieving project documents and information.
This standard prescribes general requirements for the preparation of and revision to architectural, engineering and space allocation drawings that are prepared by and for the MDOT MAA.
3.1.2 Document Classification
This standard shall apply, but not be limited, to the following drawing types regardless of source:
A. Construction drawings for new and existing facilities
B. Installation permit drawings
C. Building permit drawings
D. Space Allocation drawings
E. Design, planning and record drawings
3.1.3 Revisions to Standard
Where MDOT MAA CAD Standards do not contain the required detail for the work to be performed by the consultant or sub-consultant, additions or revisions to the standards shall be transmitted by the consultant or sub-consultant to the MDOT MAA Project Engineer for approval. All issued addenda will become part of the project-specific CAD standards. This standard will be subject to revision in response to changes in technology and by the incorporation of changes to support consultant requirements at MDOT MAA’s discretion.
The MDOT MAA requires that all CAD files be in AutoCAD DWG format, the version number to be specified by the MDOT MAA Project Engineer and selected from the Approved Software Lists provided in this section. The standards defined in this standard are specifically for AutoCAD environments. Consultants and sub-consultants that do not use AutoCAD are responsible for translating drawings into an AutoCAD DWG format prior to submittal. It is the consultant or sub-consultant’s responsibility to ensure that there is no degradation of the accuracy or content of the data in this translation process.
The Administration requires the submission of AutoCAD DWG files that are in DWG 2018 file format or later. Consultants and subconsultants may choose to use one or more products that provide additional functionality for specific vertical markets, so long as the DWG drawings delivered:
A. Comply with the Autodesk file format referenced
B. Only contain standard AutoCAD entities such as lines, polylines, circles, arcs, blocks, text, and dimensions
C. Have all elements within the DWG files comply with the MDOT MAA CAD Standards
These include AutoCAD-based products (such as AutoCAD Architecture, AutoCAD Civil 3D, AutoCAD Map 3D, and AutoCAD MEP) and non-AutoCAD-based products (such as Autodesk Revit and Autodesk Inventor) that generate certified DWG compliant files. Custom objects in the DWG files that are specific to these products must be converted to standard AutoCAD entities before submitting.