+13
I have different lines which are crossing and intersecting. I can detect where they are crossing and where they are intersecting by using a SpatialFilter.
But where they are crossing I need to know which one is the upper one. Compare it like 2 roads that are crossing: 1 on ground surface and the other one is a bridge -> I need to know which one is the bridge and which one isn't. I don't have specific information related to the z lvl of the lines.
Thanks a lot
Best answer by takashi
If a line can cross only one other line, this could be a prototype.
Takashi
am I correct in understanding that all your objects are 2D only, and that there are no other attributes to indicate bridge or not? All all features are in the same dataset?
David
+13
If you were to to this intersection manually, using pen and paper to explain, how would you proceed to determine which of the lines represent a bridge or not?
Once this is clear, it will become much easier to translate your process to FME.
David
+13I have drawn 2 different lines (for display I used 2 different colors).
Road A is the bridge as the red line is fully visible while road B has a short interuption
I do not see how FME could be able to tell which is on top, unless the order of features in your dataset is the deciding factor.
David
+13
Maybe your answer lies there.
David
+13
If a line can cross only one other line, this could be a prototype.
Takashi
David
