In QGIS 3.22.16 I try to select and delete some roads (lines) that have a False value in the attribute table. Along with that, I need to delete all the gullies (points)along these road.
I don't have any related Field in both layer. The majority of them are not overlapping on those roads. I think of creating some buffers around those roads. And using the select by location tool to highlight those points.
Is there a better way to select those points that are along the False roads?
You can try to use the select-by-expression tool in qgis.
With selected POINT_Layer use the fowlling expression (substitute 100 by the wanted buffer width):
within($geometry, buffer(aggregate('ROAD_LAYER','collect',$geometry),100))
This is based on: qgis-select-by-expression-buffer-selection
Use the collect function to create a multiline geometry. Use this multiline geometry in the intersects function. Because we're using collect on a different layer, we have to put it inside the aggregate() function
You may use the ovelay_nearest fonction to select the point (do it before deleting the line) this way :
overlay_nearest(
layer:='LINE' -- set here the name of your road layer
,filter:= "LINE_FIELD" = 'False' --filter the target features to check, set it to get roads that have a False value in the attribute table
,limit:=-1 --limit the number of matching features. If not set, only the nearest feature will be returned. If set to -1, returns all the matching features
,max_distance:=120 --an optional distance to limit the search of matching features, set it to an appropriate value to only get point close to your line
)
This will let you select only the point that are less than 120 unit (adjust the value to your need) from the LINE layer where the "LINE_FIELD" is equal to 'False' (adapt this to your actual layer and field name)
