The Bureau of Right-of-Way creates legacy alignments from past project data using Carlson Survey. Once complete, they will create a MicroStation DGN file with that data. At that point, the project designer and Bill Caswell are notified that the data is ready to be used by the design groups. The CAD/D staff will bring the alignments into MX and create a new LGY MicroStation drawing for the design team. This process is detailed below. They also add a copy of the alignment to the master legacy alignment drawing, N:\CADD\CADD\GIS_To_MicrostationV8\Legacy-ali.dgn.
Breaking up the Alignment
Make a copy of the LGY drawing. The name is not important because this drawing will be deleted once the process is complete.
Delete all features except the legacy alignments. Since MX cannot handle station equations or angle points, the alignment needs to be broken at these points. Look over the drawing to identify station equations and angle points.
Use the Break tool to break the alignment at station equations and angle points. This will create a break in the alignment. When transferred to MX, the lines will be stored as separate alignments.
Transfer Alignment to MX
Follow the steps outlined in Transferring MicroStation Alignments to MX to create the alignment in MX.
Use the RenameM add-in to rename the new alignment to conform to the MC_L naming convention
Transfer to MicroStation
Draw the alignments in MX using the NHAlign add-in which creates a MicroStation drawing. Open the newly-created MicroStation drawing and run the NHAlign macro to do some clean-up work. See Creating Alignment Drawings (v8i) if you need additional information about this process. If information on the projects that originally created the alignments is available, then the alignments for each former project should be drawn separately. When opening the drawing in MicroStation, attach other project drawings as reference files to confirm that the MX data is located in the correct location.
Additional MicroStation Processing
If the project numbers of the former projects are available, there is some additional processing to be done on legacy alignments. Select all the elements related to a specific legacy project and run a macro to alter the level names to include the project number - "VBA run modChangeLegacyLevel.main". It will prompt for the state project number and a road name. The road name is optional and rarely used.
On many older projects (typically before 1950) Right-of-Way will refer to them by the Federal Project number. To find the corresponding state number, locate the project in the list of all DOT projects maintained by the Highway Design Records section - G:\BUR34\RECORDS\RECORDPLAN.xls. The first column will contain the State Project number to be used for the legacy alignment project.
If there were multiple legacy projects, there should be multiple legacy drawings. Once the elements are renamed to include the former project numbers in the level names, combine them all onto a single drawing. Rename the 12345LGY.DGN drawing created by Right-of-Way to 12345LGY-ROW.dgn and move it from the "Prj" directory to the "ROW" directory.
Once all processing is complete, open N:\CADD\CADD\GIS_To_MicrostationV8\Legacy-ali.dgn, attach the new LGY as a reference, confirm that the data is appearing in the correct location and use the "Merge into Master" command to copy the alignments onto the master drawing.
New Hampshire Department of Transportation
PO Box 483 | 7 Hazen Drive | Concord, NH | 03302-0483
Tel: 603.271.3734 | Fax: 603.271.3914