4

I have a shapefile right now that contains many points. I would like to count the number of point points that are within 150 ft of each other.

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For example, I should count 8 locations with points within 150 ft of each other.

I tried making buffers around the points (see below) but each buffer isn't an individual.

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3
  • Distance Matrix? gis.stackexchange.com/a/194162/276
    – Mapperz
    Jun 23 at 17:24
  • I tried but I dont think I understand how to do this. This distance matrix created a matrix of all the points and the distance to the next nearest point. What I want is to essentially combine all the points within 150 ft of each other and then count how many of those exist.
    – Jez
    Jun 23 at 18:10
  • To get all buffers individually use the "Multipart to singleparts" and then apply the "Count points in polygon".
    – Taras
    Jun 29 at 6:55

2 Answers 2

6

Open the Field Calculator and use this expression:

aggregate(
    'Point_layer_name', -- replace with the name/id of your point layer
    'count',
    $id,
    filter:=distance(
        $geometry,
        geometry(
            @parent
            )
        ) <= 45.72 -- set here the distance in the projection units
    ) - 1

replace Point_layer_name with the name or id of your point layer.

1

Try also the "DBSCAN clustering" geoalgorithm. It contains a setting called 'Maximum distance between clustered points' and will provide in the end the "CLUSTER_SIZE" attribute.

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