Geographic Information Systems

Questions tagged [spatial-cluster]

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Use this tag when referring to spatial clustering in GIS.

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17 views

Creating polygons based on attributes in point layer using ArcMap

I have a point layer of residential coordinates which includes an attribute field indicating the most visited hospital for the people living at the coordinate. From these data, I want to create a ...
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1answer
38 views

PostGIS: Creating Polygon from lots of other geometries and then returning list of ID's in the same query

I am fairly new to all of this but in simplistic terms I have the following problem: I need to create lines from points, and from said points group all of those within n distance of one another. From ...
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1answer
82 views

How to choose limited number of points to represent a point grid

I need to choose a few points to represent the grid below, e.g: 8 points in the grid below. This point need to be geographic distributed This points needs to be geographic distributed. Lets see a bad ...
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90 views

DBSCAN with huge number of points

We have a dataset of approximately 30 million new points per month (latitude, longitude, and a measurement associated with that point). So far, we have applied DBSCAN to generate a monthly map such ...
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1answer
25 views

Keeping only highest point in cluster of points using ArcMap

i have a cluster of points in particular areas around NZ. I am only wanting the point with the highest value in this cluster to remain. Also many of the points have the same value, i am just wanting 1 ...
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23 views

Why modified feature resets it's position on zoom in/out in Open Layers 6

I have used select and modify interactions with OpenLayers 6, used feature option for modification. These works fine but face an issue with modify interaction. When I change the position of a feature ...
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21 views

If there is no spatial autocorrelation, should the spatial cluster detection be performed?

I have a regional count data of disease incidence. First, I calculated empirical Bayes estimate of standardized morbidity rate. Then I performed global Moran's I to check for spatial autocorrelation ...
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22 views

Assigning features to spatial clusters created by Oracle SDO_SAM.SPATIAL_CLUSTERS

SDO_SAM.SPATIAL_CLUSTERS creates spatial clusters - how to detect which feature was assigned to which cluster? Is the only way to perform an additional spatial join between cluster geometries and ...
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1answer
56 views

ArcGIS JS 4.15 Cluster Popup navigation for Cluster

I would like to migrate from ArcGIS JS API 3.x to 4.16. One other feature I am using from 3.x version is clustering. In 3.x is it allow user to click on Cluster marker and navigate between all ...
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61 views

Distance computation for geospatial clustering of lat/lon points

I am working with a pretty large dataset (~500K data points) in Python (GeoPandas) and I would like to perform geospatial clustering on some subsets (~60K points) of the data. My question has to do ...
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13 views

GeoServer PointStacker transformation and <PropertyName> based on data attributes [duplicate]

I created a point cluster style (for health facilities) in QGIS 3.12 that I try to replicate in GeoServer. The SLD saved from QGIS does not work in GeoServer (mine is 2.12 as it is embedded in a SDI, ...
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24 views

How to evaluate the statistic significance in the Neighbour Nearest Test?

I'm reviewing a scientific article to be publish. I tried to evidence that pathogens collected from different geographic areas clustered. I used Nearest Neighbour test to prove it. However, I've ...
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1answer
107 views

Statistic for measuring (local) autocorrelation of ordinal data

I have a spatial data set with a bunch of variables in nine-level ordinal scale. I want to calculate (local) spatial autocorrelation for each of these ordinal scale variables. I've been using ...
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0answers
40 views

How to cluster interconnected lines in Python without PostGIS?

I'm working with a subset of data from OpenStreetMap, where I have these island-like groups of line features. The groups are not connected to one another, but the lines are all interconnected within ...
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1answer
80 views

Clustering large number of locations

I am trying to cluster points inside the USA for which I have the latitude and the longitude. My condition is that, every point within a cluster should be less than 25 miles away from every other ...
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1answer
1k views

Clustering points in PostGIS

I am trying to cluster points in PostGIS. I have the points and the corresponding Latitudes and Longitudes which I have converted into point geometries. I want to cluster points in such a way that all ...
2
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1answer
89 views

PostGIS Recursively Finding Intersections of Polygons to Determine Clusters

My dataset currently contains about 15.000 buildings which partially touch each other. The objective is that those which do touch should belong to a cluster. This "basically" works but the main issue ...
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104 views

Defining Parameters using Spatially Constrained Multivariate Clustering of ArcGIS Pro

I have a point shapefile with 51673 features. I am trying to cluster them using the Spatially Constrained Multivariate Clustering tool in ArcGIS Pro. After reading through the documentation, I'm ...
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1answer
47 views

Cluster analysis based on both location and attribute (seconds)? [closed]

I'm looking to create clusters both on spatial density, as well as an attribute (time, in seconds). Essentially, I am trying to figure out what areas are choke points in terms of time spent at certain ...
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1answer
53 views

Create point clusters based on grid

I am trying to make a systematic cluster sampling pattern for data collection. The sampling consist of the points placed over the landscape in 6 km span (red). From this major point, I need to create ...
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1answer
94 views

Clustering geometry points, return a point's label if the point does not belong to a cluster?

I am clustering geometry points using the k-mean algorithm. The result is a list of clusters. Some clusters contain multiple points. Others only contain a single point. On the client side, we would ...
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1answer
86 views

Create fake clustered raster data in ArcGIS [closed]

I'd like to create several polygon grids with fake species occurrence (see example image) where each grid cell has a random value between 0 and 5 but high and low values cluster in certain areas as ...
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292 views

Is there an equivalent to “Build Balanced Zones” from ArcGIS Pro in QGIS?

"Build Balances Zones" was introduced in ArcGIS Pro 2.4 and allows a kind of spatial clustering with the help of genetic growth algorithm: The Build Balanced Zones tool uses a genetic algorithm to ...
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2answers
332 views

Applying ST_ClusterDBSCAN repeatedly until cluster sizes small enough

I am looking for a way to spatially clusters thousands of datapoints (potentially millions) based on distance, such that each cluster contains less than 5000 points. This is a similar question to ...
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1answer
388 views

Clustering spatial lines in R by direction

There are tens of ways to cluster spatial points in R but I couldn't find any for spatial lines. What I would like to get is the average trajectory directions that each of these cyclones (spatial ...
2
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1answer
88 views

Applying QGIS point cluster exception

I have applied a point clustering effect on a layer in QGIS. What I'd like to be able to do is cluster on all features except the ones that I have a NULL value in an attribute. I can Categorize on ...
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2answers
365 views

Problems with ST_ClusterDBSCAN cluster sizes

I want to cluster all villages (and towns, ...) around the world. So instead of having millions of them, I'd like to reduce them by combining villages that are close enough (like 10km or so) to each ...
2
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1answer
172 views

Fixing colors of LISA Cluster maps from Pysal?

I am using the LISA Cluster package from Pysal to create a LISA (Local Indicator of Spatial Autocorrelation) map. As the example of the documentation shows, the color lightblue is used to identify ...
3
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1answer
90 views

Get the probable right location from multiple points

I have a location collection tool which send me location data of our survey. Surveyors send multiple data of a single item. Such as they send numarous data for a school like the following image. From ...
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1answer
164 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 ...
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1answer
147 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 ...
1
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1answer
88 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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47 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
91 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 ...
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0answers
72 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 ...
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1answer
219 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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1answer
132 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 ...
3
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0answers
736 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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1answer
729 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
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1answer
623 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 ...
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0answers
190 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
453 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 ...
6
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1answer
881 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.
2
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1answer
201 views

Dissolving polygons on distance condition using PostGIS?

I'm tying to group some polygons in same layer, on geometry & attribute conditions: within 0.8m from each other and with same value in a column. With answers I've found here I've got something ...
1
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1answer
219 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
145 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 ...
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1answer
97 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 ...
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1answer
44 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
49 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 ...
4
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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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