Reply To: How to draw roadway from Center-line survey points?

Traverse PC Land Surveying Software Forums Support How to draw roadway from Center-line survey points? Reply To: How to draw roadway from Center-line survey points?

#65787
John
Keymaster

Yes, you can do that.

1. create the center line from your points

As a rule, we collect points along the tangents and in the curves, but don’t know where the PC’s (Point of Curvature) and PT’s (Point of Tangency) are. If you think you were able to pick out the PCs and PTs and have included them, continue on to step 2. If not, you will need to use the line and curve fitting tools in TPC to approximate the tangents and curves and compute the PC’s and PT’s. Not sure how exact you have to be for this job.

2. add any additional stations along the centerline

Sometimes, the job or contract requires that we compute stationing along the alignment. TPC has a COGO, Stations routine to put these points in. It even interpolates their elevations.

3. create a 15′ wide road R-O-W with offsets left and right

Select your center line traverse and choose COGO, R-O-W Offsets. Create offset traverses 7.5′ from centerline, both left and right. Let TPC create these traverses for you.

4. now create a new traverse to get the area

Since both R-O-W left and right traverses are going the same direction, I would use the Tools, Sort Points to reverse the order of one ROW traverse, then add it to the other ROW traverse. You now have your area.

Hope this helps. I’ve done lots of these, mostly with very exacting Step 1s.