Hi,
there are two sets of line feature. The lines of the first set are interrupted, figure 1. The second set is a whole boundary line extracted from a polygon, figure 2. The coordinates of point 1 and point 3 are equal, so do point 2 and point 4. Now I want to add the bottom line from the second set to the first set, leaving this yellow line, and breaking at the intersection. What should I do? Thank you so much.