How to add a column to "link" lines to polygons (Qgis)?

Question

First i'll show you this image

The green polygons are lots/land/property of different people of my city. The blue lines are the river banks of a river that crosses my city. The red lines are called here as "Estacas"... in english they can be translated as "poles".

What are these poles. They are lines that measure the distance of a construction (like a house) to the river bank.

What I have to do now is link, somehow, these poles to the lots.... each lot have an ID and each pole also have an ID. But there is lots of poles per lot. Like, the first lot, right-to-left, has seven poles crossing it. So, these seven poles, and only them, have to be linked to that one lot. (and so on to with the other lots and other rivers on my city)

Can I do that? There's a way, with Qgis, to do it?

Answer 1

Based on your question and comment, I've reproduced your topology. here's one way you can do it:

Step 1: Convert the lines to points using the Vector -> Geometry Tools -> Extract Nodes. This will create a point layer with 2 point for each line segment, one at the start and one at the end, which retain the tabular data, including the pole ID.

Step 2: Select the points on the side far from the river, either by a spatial selection, or manually

Step 3: Intersect the endpoints with the polygon plots. This will create a new point layer where each point has the attributes of the Poles AND the Plots

Step 4: Joint the original Poles line layer with the new intersected layer, based on pole unique ID field. This will append the plot ID to the pole ID.

Step 5: save as a new layer or perform summarization, depending on your need