Is it possible to create a compound curve with spirals using civil geometry?
This was relatively easy to do in InRoads SS2 (using the SCSCS option): define the curve radii and spiral lengths and a pass-through point or arc deflection. It doesn't seem possible using civil geometry (SS4, .878) without manual calculation and a lot of head banging. I have managed to create a compound curve with a spiral in the middle, but it is always a full spiral rather than a spiral segment (aka combining spiral).
I can import such an alignment from native and it will work but I can't edit it with the civil geometry tools.
Since pretty much all of the curves on the state highway system are spiraled, full support of spiral geometry is a must for our agency to move beyond SS2. Is this possible in ORD?
The attached image shows one such situation. It took less than 2 minutes to resolve in SS2.
TIA
Will the following work for you?
Robert Garrett Senior Consultant
www.envisioncad.com
That does solve part of my problem - it results in a spiral segment between the arcs. I haven't been able to get that before
It suffers from the requirement to enter multiple pass-through points (the PS and PT, in this case). Essentially. I need to resolve the geometry manually before I can create the civil geometry. Also, it cannot be edited.
Bump.
Do I need to keep SS2 indefinitely in order to resolve this type of alignment without having to hand calculate the semi-tangent lengths? We have these on highways all over the state and trying to resolve the alignment to match the found monuments can take several iterations.