Questions tagged [spatial-cluster]
Use this tag when referring to spatial clustering in GIS.
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30 views
Forming designed clusters of points in ArcMap or ArcGIS Pro [on hold]
How can I make clusters of 7-10 points that should not be more than 1 mile of themselves. There are over 1000 points and I've always made the clusters manually but its time consuming.
How can I do ...
0
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1answer
20 views
Spatially constrained multivariate clustering in ArcPy gives AttributeError?
i want to use the Spatially constrained multivariate clustering tool for a point shapefile. I'm using PyScripter. The shapefile is named "LITO2016_area_modelli_20190312_v2" and the attribute fields i ...
1
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1answer
27 views
Creating clusters based on attribute and proximity [duplicate]
In my map as you see below, I have my population by district.
I want to create 50 clusters with similiar sums of the population and by proximity. How I can achieve this?
For each cluster, I want the ...
0
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1answer
52 views
Calculating Moran's I for buffers of forest cover?
I'm trying to figure out if buffers I have created in ArcMap (measuring percent forest cover in a 1 km distance from a land use map within the buffer) around points at which I will be collecting ...
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0answers
42 views
Point patterns clustering around reference points?
I have two point shapefiles. I want to analyse whether the points in the dataset A are clustering around their respective reference point in the dataset B. Each reference point in the dataset B has a ...
3
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1answer
49 views
How to UPDATE a column with cluster IDs in PostGIS?
I have a table with points in it, and I want to cluster them. I had created a separate table to hold the clusters, but I ended up copying all the data from the original table into the new cluster ...
3
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0answers
49 views
Clustering based on eqaul populations
I have a map of a city that is divided into 65 sectors (building lots in purple, sector boundaries in red):
In my shapefile of building lots, I have an attribute that is the total population within ...
1
vote
1answer
33 views
Cluster geometries that touch each other
I'm trying to cluster the geometries in a sf object that touch each other. For the moment I'm using the same approach that it's explained in the answer here, but the problem is that the same idea ...
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0answers
15 views
What is the underlying algorithm of sdo_sam.spatial_clusters in Oracle?
Oracle has a "sdo_sam.spatial_clusters" function for spatial clustering. What is its underlying algorithm?
Unfortunately the Oracle docs do not mention the algorithm or describe in which way the ...
0
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1answer
65 views
Combining points close to one another
I need an approach to combine points close one to another into a common point.
I can take an average of points' {lat, long} to create one point.
How I can do this with ArcMap or Python? I have an ...
1
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0answers
139 views
PostGIS - Dynamic Server-Side Clustering based on Zoom level
I'm working on a Ruby on Rails application that is showing road signs on the map(leaflet). So, user can browse map and road signs, great. But, if there are a lot of signs and user wants to zoom out, ...
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0answers
35 views
How to do cluster analysis for trajectories in ArcMap 10?
I have an air trajectory shapefile (lines shapefile). I would like to do a cluster analysis to see the 3 main cluster for these trajectories in ArcMap 10. This picture is an example of what I desire.
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1answer
115 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 ...
2
votes
1answer
96 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
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0answers
65 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 ...
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0answers
110 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
189 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.
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0answers
76 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
76 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
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0answers
74 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
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0answers
78 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
66 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
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1answer
41 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 ...
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0answers
33 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 ...
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0answers
186 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
673 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
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0answers
127 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 ...
10
votes
1answer
482 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 ...
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 ...
2
votes
1answer
601 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 ...
4
votes
1answer
332 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
149 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
202 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
138 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
250 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(...
2
votes
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
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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 ...
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1answer
119 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
646 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 ...
