Adjust Alignment Elevation help

So, I came across the “adjust linestring elevation” command. Is there such a command to adjust the elevation on a vertical alignment? On highway projects we need to make adjustments to the PGL for the tie in locations and the “adjust linestring elevation” would be great to help adjusting the vertical alignments. If there is not such command can we get this as part of the RPS commands?

You can convert the alignment to a linestring and then use the adjust linestring elevation on the linestring to determine the adjustments and then you can use it to make a new alignment.

Use convert to linestring comand

You can also just edit the vertical alignment using the alignment editor - put a grade break in eg 209’ from the end of the val and then adjust the VAL end elevation - that may work if there is no vertical curve in that section - if there is a vertical curve then use the first method to do the calcs.

Alan

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Francisco,

If you’re wanting to delta the elevation up or down by some offset: open up the profile view for the alignment, select the vertical profile, and then use the “Move” command to adjust it up or down the desired amount. To keep things precise, after selecting a base point for the move I use Bearing/Distance (0 = UP, 180 = DOWN) to enter the destination point. Depending on the situation, it might be easy to just manually enter the coordinates (they’ll be in station/elevation instead of northing/easting).

“Move” command in alignment profile view is handy for fixing other issues too, like you can shift the vertical alignment forward/backward if the stations are out of sync - e.g., you convert an elevated line to alignment, but then you need to change the start station to something other than 0+00, but the vertical alignment still starts at 0+00: you can use “Move” with Bearing/Distance to move the vertical alignment to its proper station.

And if you need a perpendicular offset up or down, use the Offset tool to create an offset line, then create a new vertical alignment and append the linestring you just offset from the original vertical alignment. You can keep both or delete whichever ones you don’t need (you can switch active vertical alignment via the properties pane if an alignment has more than one associated with it).

Another cool trick: you can use “Convert to Linestring” on surface profiles in the profile view to turn them into linestrings; then you can append them to a new vertical alignment to get an effect similar to draping the alignment on that surface; or you can edit them first, offset them, move them up or down etc to visualize minimum bury depths, embedment etc.

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