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cross section stationing
I have a project where one of the deliverables is cross section data (tabular) at 25′ intervals for a 2900′ section of highway (one side only, two eastbound lanes). We scanned it, so I just need to cut the sections out of the point cloud. It is tangent-curve-tangent. But, there is a station equation at the PC, with a change of about 5.8 feet. How is this typically handled? I have a request in to the end client, but just wondering what others do.
I would usually put sections at even 25′. This project was a bit difficult because the highway is the original 1949 section (most other parts have been widened, with monuments placed). This section has no monuments, so all I have to go off of is the 1949 plans. The only things on there that I can use are two overhead bridges with data on the plans, one on a curve and one on a tangent (which is skewed to the C/L of the road). It does have a C/L median barrier, which is where the alignment line goes (no spiral). Interestingly the catch basins in the median are all on 200 foot spacings (if there is one). Since the median barrier was not there originally, I have to assume that the CB’s were rebuilt, one on either side of the median barrier. My client located all four corners of all of the CB’s, plus the inverts. But the stationing on these varies å± a foot or so, so not real useful for trying to recreate the original alignment and stationing. They had to shut down a lane to get these as there is no real shoulder. It matches our scan data extremely close, not even perceptible.
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