Hello everyone,
I have a question regarding regression analysis.
I imported the survey points, created the regression line and use the curvature diagram to create the corresponding geometry. However, I hit a little bit of a roadblock.
According to Bentley's material, the process to create a a geometry is to first define the curves and straight section, then bridge them with transition curves. However, what happens when the regression line starts from a transition curve? There is no other suitable element to be used as a footstep to bridge the gap with transition curve, since regresssion line beign with one.
How do we handle such situations? Attached you will find a screenshot of the data.
//Filipp Zarov
not always easy in such situation if you don't have additional information. You may have just a portion of the spiral and we don't know from the visible data if it is a spiral connecting an arc or a straight. Anyway, I would first ignore the spiral and do best solution for arc, spiral, straight. Then you can add a spiral from element and do iterative process to get the best one.
Answer Verified By: Filipp Zarov
Thank you for your reply.
I totally agree with all the remarks. It is a difficult situation because from the curvature diagram i understand that it must be a spiral element. In this specific case, the only elements which can be used as ''anchor'' of sorts is a curve element on one side and a track barrier on the other. Any tips for this case would be appreciated.