There are some softwares like Ispol Istram that we can establish a dependency between alignments. An alignment is dependent from another alignment, so it is dynamic.
When I talk about aligment, I refer about an entity of the alignment. In general, it will be the first entity of the alignment.
Imagine that we have 2 alignments (al-1 and al-2). "al-1" is the main road, and the "al-2" is a branch.
We could specify the first point of the entity (from the "al-2") in different ways:
- Name of the alignment and station in that alignment. (the first point will be located in that station)
-Name of the alignment and point (the projected point to the alignment will be the station).
-Name of the alignment and the number of the entity of that alignment. And a Delta length counting from the start of that entity to get the station.
............................
So , if the "al-1" is modificated, then the start point of the entity (of the second alignment) is also modificated.
Moreover, we could use several parameters as an angle, offset, ...
Look at the following pictures:
the "angle" is the change of direction between the entity of the first alignment (in that station) and the first entity of the second alignment.
This angle will be the tangent. tg(alpha)
the offset will be the ortoghonal distance from the point (in that station):
About "alignment offset", I would like to lock some parts (entities) of the alignment (those entities will be dynamic) and I could add new entities of the alignment among those entities.
Show More