transferring data from ArcGIS to TNM 2.5

[PolashBanerjee]

has anyone worked in  FHWA TNM 2.5 for noise impact modelling using ArcGIS for CAD file preparation?

[hannawoldemariam]

Hello,

I know this is an old post, but I was wondering if you are willing to share the process of creating TNM elements in GIS (ArcMap) specifically roadways and terrains. I am familiar with TNM 2.5 and GIS, but I usually work with CAD designers to provide me with the xyz's and I just input that into TNM to create the model. I am trying to learn the best way to prepare the TNM elements in ArcMap (digitizing roadways etc..)

Thank you in advance for your assistance.

Hanna

[BrandonBatt1]

I wrote this to handle generating z-aware spatial templates for digitizing with gis software. There's also a utility for converting the template into a STAMINA format that TNM 2.5 can directly import. Some items don't translate in the import (roadway widths, receiver nac levels, etc.), but roadway, receiver, and barrier geometry pull in just fine.

https://github.com/fstraw/pytnm

[Sean_Wray]

CREATE 3D LANES LINES FOR TNM MODEL

I usually use a striping file from the design engineer.
I convert that file to a shp file and then use copy parallel to create the center lines of each travel lane.

• For each lane, merge each feature part into one feature
• Remove "parts": Review and Edit vertices to connect parts by reviewing sketch properties
• Remove extraneous vertices: Run Generalize tool (Editing tools). Set tolerance to 1 or 2.
• 
• Create vertices every 100 or 200 feet: Run Densify tool (Editing tools) - set it for every 100 or 200 feet. It  is located in the editing toolbox
• 

Next you need to have a source to obtain elevation data. For a proposed roadway you have to get the roadway surface from the designer and convert it to a DEM for use in ArcGIS. I use a software called Global Mapper to merge this surface with an existing DEM to create the proposed surface that contains the roadway and the surrounding area. 

Then do the following.

• Run Interpolate Shape tool (3d Analyst tools > Functional Surface) - this creates a 3D SHP of the lane lines *Only calculate elevation at vertices.
• 
• DELETE THE ELEVATION ATTRIBUTE (if one exists)
• Note if this is not done there will be no elevation contained in the DXF you make in the next step

• USE GLOBAL MAPPER TO CONVERT SHP TO DXF