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I'm working on a project that wants me to find the names of items at the start and end of a line.
I have a point at each end of a line, these points all have a name. I would like to get the name of this point and populate a field called source with the name of the point and then repeat this for the end of the line with the field target.
Is it possible to do some kind of geospatial analysis to get this information?
On the line layer, create a new field with field calclulator and the following expression for the start-point. The expression creates a buffer around the start-point of the line, then looks for the two closest points to the line and checks which one lies inside the buffer. From this point, it takes the value of the field name.
Adapt the expression as follows if necessary:
start_point (line 8) with end_pointpoints with the name of your point layer and name with the field-name you want to get.0.001 at the end of line 8. This is the size of the buffer around the start-point of the line and the expression checks which of the points is within this buffer.2) to the max. number of points that are on a line.array_first(
array_remove_all(
array_foreach (
overlay_nearest ('points',$id, limit:=2),
if (
within (
geometry (get_feature_by_id ('points',@element)),
buffer (start_point($geometry), 0.001)
),
attribute (get_feature_by_id ('points',@element), 'name'),
''
)),
''
))
Get the value of the point layer's name attribute of the point that lies on the start- and end-point of the line as an attribute on the line layer. Here the expression is used in a combination as a dynamically created label of the line:
