Questions tagged [spatial-cluster]
Use this tag when referring to spatial clustering in GIS.
30 questions
0
votes
1answer
26 views
ST_ClusterDBSCAN in PostGIS gives me 0 for the cluster ID
I am trying to cluster latitudes and longitudes from a dataset containing locations in Germany (n=52612, about 9000 without duplicates).
I am running the DBSCAN algorithm, but for none of the ...
1
vote
1answer
47 views
Clustering spatially connected polygons so all clusters have approximately the same size
I want to group together polygons from a shapefile a way that all the clusters formed contained approximately the same number of polygons. The problem is that the source polygons have vastly ...
1
vote
0answers
42 views
Cluster LineStrings using HDBSCAN?
I am trying to cluster a set of LineStrings (made out of lat/lon Points) with the help of HDBSCAN (using the "haversine" metric). The objective is to define the most "usual" path.
I have only managed ...
1
vote
0answers
29 views
Algorithm to cluster coordinates within a maximum radius [closed]
I am looking for an algorithm that will allow me to find the centers of clusters of an arbitrary radius, such that all coordinates are covered.
Currently, I am doing a very basic routine where I ...
4
votes
1answer
79 views
Creating Groups of points based on proximity in QGIS?
I have a dataset with around 900 points and I want to cluster them into groups of 44 based on proximity.
Is this possible in QGIS?
I have tried to use the convex hull tool with no success.
0
votes
0answers
38 views
Data-driven cluster colour with mapboxgl
I am trying to draw circle which colour depends on a "group" attribute in my geojson. I followed a simple example with these colours:
map.addSource("data", {
type: "geojson",
data: url,
...
1
vote
1answer
50 views
Generate spatial weight matrix from file in ArcGIS
I am trying to create a spatial weight matrix from an existing file in ArcGIS. I need to use another file, as opposed to generate the weights in Arc, because I define non-standard weights. The ...
2
votes
0answers
59 views
GIS Clustering with drawing predefined square area around points as cluster boundaries
I have a layer of points and I would like to create clusters where a predefined square area of 5km by 5km is the boundary for the cluster.
Is there a way to iteratively draw square polygons around ...
0
votes
0answers
38 views
cluster polygons with scipy linkage using the bounding box
I'm trying to cluster some polygons and so far I'm using linkage following this tutorial with the polygon's centroids and cutting the cluster at a specific max_distance. The results are not as ...
0
votes
1answer
57 views
Point Similarity Clustering
I am new to geographical statistics so please pardon this question if it is a duplicate. I would like to test if points that are similar are more or less likely to be near each other. I am latitude ...
0
votes
1answer
40 views
Are points similar to nearby points using R?
I am new to spatial statistics.
I am trying to determine if points close together are more or less similar. Specifically, I have a series of lat/long points for alligators nests. At some nests, one ...
1
vote
0answers
26 views
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 ...
0
votes
0answers
153 views
Find clusters with points above threshhold value … Value > 50 within 2 miles
Problem
Need to identify a way to find 2 mile clusters of points where each point has a value. Identify 2 mile areas which have a sum(value) > 50.
Data
I have data that looks like the following
...
4
votes
1answer
415 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 ...
0
votes
0answers
86 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 ...
7
votes
0answers
235 views
+50
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 ...
0
votes
1answer
40 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 ...
0
votes
0answers
57 views
Correct SRID for worldwide spatial clustering with ST_ClusterDBSCAN
I use ST_ClusterDBSCAN to cluster areas with a high density of points together. My points are stored in the database as a geography type with SRID 4326.
For the clustering eps I define meters. The ...
1
vote
1answer
390 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 ...
3
votes
1answer
269 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
votes
0answers
117 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 ...
1
vote
0answers
166 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
votes
1answer
122 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
votes
1answer
182 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(...
1
vote
0answers
2k 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 ...
4
votes
0answers
1k 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 ...
1
vote
1answer
104 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
votes
1answer
1k 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 ...
4
votes
2answers
495 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 ...
1
vote
1answer
1k 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 ...
