Questions tagged [clustering]

Partitioning data points into subsets of objects according to their mutual "similarity," without using preexisting knowledge such as class labels.

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1answer
667 views

How to cluster data (and not only the number of markers)

I wanted to display some data (a number, different for each point) on a map (either Google maps or OpenStreetMap). Each point has an associated value (the number above). For markers which are close ...
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0answers
168 views

k nearest neighbour with count limit

I have a set a points, and I want to create 10 clusters. I used attribute based clustering plugin, which worked well for creating the clusters, but the points count isn't perfect, some clusters have ...
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1answer
367 views

Clustering point data to obtain maximum count groups using QGIS?

I am working with a data set of over 3000 points which I need to cluster/group based on a distance criteria. What I would like to do is build clusters from the point data which contain the maximum ...
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1answer
530 views

What alternative to Voronoi polygons should I use for my QGIS problem? 2d Clustering?

I have a table with all the hotels in Paris. The columns are the name of the hotel, the geocode and the neighborhood (arrondissement) of Paris that hotel is in. I've plotted all these points in GQIS ...
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1answer
589 views

Where is Cluster point style in new Carto?

In the old interface for CartoDB (Carto Editor?) overlapping points could be displayed as clusters allowing users to click on a cluster to distribute the points visually and select one to read the pop-...
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1answer
194 views

Using Weighted sum and Grouping Analysis?

I have a collection of points representing buildings, and each has a number value. I need to look at building within 50 miles of each other, where the total number values of the building in that ...
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0answers
337 views

Spatial Data Cluster in sql-server ? ( like ST_ClusterWithin in Postgis )

Postgres 9.5 providing ST_ClusterWithin for Cluster the spatial data in DB level. Is there any available solution for data clustering in MS SQL (NOT SERVER CLUSTER) OR Is there Any Function ( like ...
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0answers
418 views

Spatial clustering with attribute

I need to do some sort of spatial clustering where each spatial coordinate has a value attribute. So, for example, each point has a salary attached to it. So each cluster would have a total salary if ...
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1answer
267 views

Specifying minimum cluster size with OpenLayers 3 Clustering?

With OpenLayers 3, how can I specify a minimum cluster size so that clusters with 5 map markers or less will not get clustered, but will instead display the individual map markers? Is there a way to ...
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1answer
2k views

Getting feature data from vector source using OpenLayers 3?

I need help concerning feature clustering in OpenLayers 3. I have a vector layer that dynamically "collects" a large number of features. All features have various properties like title, content, ...
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0answers
267 views

What techniques exist for clustering road routes?

The typical clustering (by proximity) techniques that I've seen - hotspots or marker counts - relate to single point data. Different challenges exist for deciding the significance of proximity in ...
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1answer
3k views

Improving display efficiency of OpenLayers 3 Cluster?

In OpenLayers3, when the number of points more than 1,000,000, the display efficiency is too low. How to solve this problem? The following code is the example in OpenLayer3, and I had changed the ...
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3answers
992 views

Clustering undirected lines

I'm looking for an efficient way to cluster lines independent of their direction. That means that a line between New York and Los Angeles should be in the same cluster as a line in the other direction ...
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0answers
128 views

Comparison of clustering methods on geodemographic classification

Most geodemographic classification systems using K-means method for clustering and creating segments. For example, ESRI Tapestry(Business Analyst) is most using geodemographic system lately. What ...
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1answer
158 views

Using where clause in ClusterFeatureLayer

I am using the ClusterFeatureLayer (cluster-layer-js) and I am trying to use where clause. It works fine when I use it in initial request something like this: clusterLayer = new ClusterFeatureLayer({ ...
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1answer
155 views

Regrouping concat labels with overlapping intersecting geometries in QGIS

All the fields i want to show on the map are in the same layer. All the labels have to be showed on the map. But the concentration is high. So i would like to concat the labels when geometries are ...
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2answers
864 views

How to cluster points based only on location

I have profile data points which lie almost on a line (s. picture below) Is there an easy way / plugin to add an attribute to each point which states to which profile line it belongs? It should not ...
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0answers
111 views

Analyse driving pattern from automotive dataset

I am trying to derive driving patterns from our automotive dataset. Our dataset has vehicle names along with their GPS points. One of the driving pattern I have read about is “hub and spoke” in which ...
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1answer
567 views

Leaflet - Leaflet.MarkerCluster.LayerSupport add/remove layers using external checkboxes?

I'm trying to implement the Leaflet.MarkerCluster.LayerSupport plugin following this example, however while it seems easy to add and remove data using buttons, there is nothing here to indicate one ...
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1answer
148 views

Adding excel XY data to Arcmap

I am having some issues with adding xy data from a .csv file. As you can see in the picture below the points are clustering. I am not sure if this is a excel format issue or a arcmap issue. I am ...
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0answers
277 views

Visualizing BIG datasets with leaflet-heat [closed]

I am trying to find a fast method to visualize very BIG datasets (up to 1,6 Mio points) as a heatmap with javaScript. I tried to use leaflet-heat.js, but it is extremely slow with such a large number ...
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1answer
734 views

Clustering - Need to group points as I zoom out

I do not have much experience with ArcGIS Online but there is a work that must be done. I have a groups of points and they represent addresses where a certain work has been or not performed. I need ...
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0answers
183 views

How to find peaks by comparing with neigbhour points

I have a raster layer with 3 bands band1 - elevation data band2 - x-coord band3 - y-coord I want to run  a grid of 9*9 cells over this raster layer staring from top-left to bottom-right row-wise ...
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2answers
2k views

Estimate the fractal dimension of two dimensional data in R

0 down vote favorite I am trying to estimate the fractal dimension of a list of coordinates, such as: X1 X2 1 0.6073672 0.6663980 2 0.6837522 0.6080113 3 0.5109583 0.6071990 4 0....
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1answer
364 views

Browser crash when using marker cluster in leaflet

When using the following portion of code, the clusters and some markers are shown but if I zoom or click anywhere the browser crashes. var cam = L.ExtraMarkers.icon({ icon: 'fa-video-...
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1answer
365 views

What is the easiest way to summarize/aggregate/cluster point features?

I have a file with more than 2000 point features and I want to summarize them. However the points that interest me the most, are the ones with the fewest neighbours. The point features which appear in ...
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0answers
79 views

Clustering population data respecting given regional divisions?

I am familiar with clustering algorithms from machine learning and signal processing, for example for training vector quantisers. Recently, I have come across a problem in the GIS area that I am ...
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0answers
579 views

Query a different density of points based on zoom level in PostGIS

I have a database (using PostGIS) of a few million points that I load onto an interactive map. Obviously the map can't handle this many points, so I currently restrict it by limiting to the points ...
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1answer
1k views

Cluster features - get value properties of feature - on style function

I struggle with not very complicated issue, I need get average values on my cluster features. Without cluster it's OK, I get the value but how to get value in cluster set? with cluster value: ...
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0answers
151 views

Modify OpenLayers 3 clustering

How to add clustering strategy in OpenLayers 3 like OpenLayers 2? anyone have example? I want to clustering only the feature with have same class and every clustering I want give a overlay.. ...
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1answer
171 views

How to spiderfy stacked POIs in CARTO's standard map?

I'm creating this map on CARTO. Some POIs are stacked even at max zoom level, so some POIs are impossible to be clicked. Are there any methods to make these POIs spiderfied?
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0answers
243 views

Spatial Clustering With Roughly Equal Sizes

I'm not sure which plugins or tools I'd want to further research to achieve my goal. I have a layer which breaks my geography into regional blocks and an attributes table with a column for number of ...
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1answer
177 views

Clustering plots points into groups based on their elevation using QGIS?

I have a plots shapefile for a region (polygon)converted to centroid points. I have added the geometry column to it and also added elevation attribute to every point by sampling the plots vector file ...
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2answers
695 views

Limit radius of ST_Clusterwithin (PostGIS)

I have a set of over 800k points and I am looking to cluster them within specified circle radius. I need them to be clustered to maximise the number of points within the circle. This is to model how ...
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1answer
4k views

Trying to get Spiderfier to work with MarkerClusterer in Google Maps

I have just over 100 points to display on a map and had it working fine. Quite a few of these points are displayed at the exact same coordinate position so sit on top of each other. To make it so ...
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1answer
6k views

Clustering points/polygons based on proximity (within specifed distance) using QGIS?

I have seen similar questions asked about grouping points and Concave Hull being given as an answer, but in my case there are no "features"/attributes that will classify the points. The only parameter ...
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1answer
2k views

How do I Cluster by an Attrbute?

I'm making a Leaflet map, and using the Marker Cluster plugin to cluster a Few Thousand Markers. On of the attributes in my Data is the State that this marker lies in. I would like that at the ...
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1answer
663 views

Find regions of high density of points of the same class

I have a dataset consisting of geo points of two classes. For simplicity we can call one class "successes" and the second one "failures". What I want to do is to find regions (areas, polygons) where ...
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2answers
553 views

Grouping/identifying clusters within polygon data set via accumulation of area

I have a polygon feature class representing discontinuous fields often quite far apart but sometimes there are clusters of smaller sites, and I would like to identify these clusters based on ...
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0answers
64 views

OLS tool in ArcMap 10.4: Spatially Autocorrelated Explanatory Variable

I am performing ordinary least squares regression analysis on two variables: K concentration in soil as explanatory variable, and thickness of stalk of plants as the dependent. The K-concentration ...
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1answer
1k views

MarkerCluster don't work with geojson layer in leaflet

I have created gejson layers and I want to use MarkerCluster option in one of them. But I don't know what am I doing wrong and where in my code is a problem. I tried something like this: Scripts: &...
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1answer
216 views

Uncertain about the “n” in Getis Ord Gi* statistics

The formula of Getis Ord Gi* statistics is here. n is supposed to be the total number of features. In the numerator of the Gi* statistics, it looks as though it is comparing (by subtracting) the ...
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1answer
425 views

Clustering Geoserver with shared session

I have succeed in clustering geoserver on windows using three Apache tomcat instances and Apache server as load balancer. I also shared the data directory but I have two issues: when I try to login ...
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1answer
365 views

From a lat/lng point, load data clusters of other lat/lng points within radius using PostGIS

Very similar to how Zillow's mobile app mapping search works, I'm trying to pass in the lat/lng points & radius (meters) of a single user and then, on the fly, generate clusters to enable passing ...
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0answers
81 views

Using ArcGIS for clustering and correlating large datasets [closed]

I have a large amount of historical lightning strike data (with lat, lon and timestamp) and am trying to separate out isolated events, which aren't part of larger clusters found in thunderstorms (i.e. ...
4
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1answer
480 views

Clustering (ConvexHull) data based on distance

First I would like to mention that I am not an expert with PostGreSQL so my question may seem dumb, but here it goes: I have a database with over 800 000 points associated to a geometry (EPSG 2950) ...
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0answers
71 views

Examining each connected pixel to select its neighbors to separate clusters using ArcGIS for Desktop? [duplicate]

I am trying to develop a methodology for separating pixels from one another to determine whether they belong to a city cluster or not. Starting at the center pixel of the city I want to select all ...
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1answer
6k views

Is it possible to cluster polygons in Leaflet?

Is it possible to cluster polygons in Leaflet? In a similar way to the Marker Cluster plugin
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1answer
382 views

Regrouping points together based on a sum

I have a vector layer containing points. Each point has an attribute called 'number of houses'. I want to dissolve this vector layer in many areas, each area must contain between 643 and 653 house and ...
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1answer
254 views

Weird behavior with st_clusterwithin

I'm not sure I'm doing this right, I've two locations, one a point and one a point within an area. I'm running them through st_clusterwithin, and they both create 2 individual cluster groups (which is ...