Questions tagged [spatial-cluster]

Use this tag when referring to spatial clustering in GIS.

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Find cluster of points within a 14K dataset which are laying within a circle of a certain radius

I have a dataset of geolocated points, which are dispersed over a large area I need to find clusters of a minimum number of X points within these sets which are laying within a circle of which the ...
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1answer
2k views

python cluster Points with DBSCAN keeping into account Polygon boundaries

I have a GeoPandas dataframe called geo containing: 431978 unique spatial Points representing all households in a city. 112737 Polygons representing all the premises (panden) in a city dataframe ...
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246 views

Is Spatial clustering with PostGIS possible to generate N number of groups that have 10 elements?

I need to create a query using some sort of spatial clustering algorithm within PostGIS database. Currently, I am using pgAdmin version 4. More specifically, I need to create N number of groups that ...
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1answer
2k views

Raster clustering using QGIS

I'm looking for a way to convert a classified raster into polygons based on spatial clusters within each class. For the clusters to be considered as valid I need them to consist of a minimum ...
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1answer
51 views

How to re-assign attributes based on spatial relationship

I want to re-assign the attributes of a table of regular polygons based on their spatial relantionship so that the polygons are clustered like this: This essentially means to swap the attributes from ...
3
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1answer
2k views

Understanding ST_ClusterWithin

I am trying to create a map which shows points that are clustered (or not depending on the distance between the points). So, I have the following query: SELECT ST_NumGeometries(gc) as ...
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1answer
582 views

Spatial clustering points on a spatial network in QGIS / PostGIS

I have some thousands of houses/addresses (points) and a road network and I would like to build clusters of defined minimum to maximum cluster size not using euclidean distance as a metric, but the ...
3
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0answers
208 views

Find number of weighted point clusters & centre of clusters

I have a points layer with a frequency field indicating a population at that point. There is also a field indicating the broader area by which I need to analysis broken down into. I am expecting the ...
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0answers
342 views

Use QuadTree in R to create Geospatial clusters [closed]

I am currently looking into different clustering techniques to form clusters from geospatial data. Is it possible to utilize quadtrees(from the SearchTrees package in R) to come up with something ...
2
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1answer
207 views

Cluster analysis for different plant species with elevation, aspect, slope rasters using ArcGIS Desktop?

I am using ArcGIS Desktop. I have a point shapefile for 5 different plant species and rasters (elevation, slope, aspect, canopy height). I am trying to find clusters for each species in terms of ...
2
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1answer
377 views

How to use ST_Contains() with ST_ClusterWithin()

I need to write a spatial query which will return centroids of clusters which are within a bounding box or polygon. The query I have now is: SELECT ST_NumGeometries(unnest(ST_ClusterWithin(...
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0answers
3k views

Clustering latitude longitude data based on distance

I have a large dataset of latitude and longitude. I want to cluster the data into groups based on distance such that the distance between two points in a cluster is not greater than a minimum ...
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0answers
2k views

Clustering of events within a space-time window (R)

I am relatively new to clustering methods and am trying to determine the best method for clustering (or merely grouping) events that fall within a space-time window using preferably R. My goal is to ...
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1answer
170 views

Maximising cluster density around geo points using qgis

I am looking for some advice for clustering points around other defined centres while maximising the density i.e. I need to identify clusters but constrain the cluster densities to be >= ...
6
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1answer
2k views

Seeking Fréchet distance implementation (Python) to cluster trajectories by similarity

I am working on a trajectory analysis project using Python and its data science related libraries. I am planning to implement Fréchet distance algorithm for trajectory analysis, each trajectory has ...
5
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2answers
1k views

Point cluster in ArcGIS Javascript API 4.3?

I am trying to create a map with the the ArcGIS API for JavaScript v4.3. Some of the points that I want to visualize are on the same location and I would like to use some type of point clustering to ...
3
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1answer
2k views

Run spatial clustering by inputting coordinates to cluster algorithm

I've been reading about algorithms for spatial clustering and it's easy to get lost since there are dozens of them. An idea that came to my mind is to use an a-spatial cluster algorithm on a dataset ...

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