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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66 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
226 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
439 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
378 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. ...
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1answer
491 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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73 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
393 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
257 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 ...
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105 views

Creating clusters based on nearest distance attribute in ArcMap using ModelBuilder

I am attempting to create a tool via modelbuilder that creates clustering for a polygon feature class based on the distance field attribute (between one polygon to another) that I have created using ...
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2answers
2k views

DBSCAN spatial clustering in R

I have file with coordinates X, Y of point objects in EPSG3301 coordinate system (that means it is in meters). I want to spatially cluster points. Here is my R code (dbscan package): db2 <-dbscan(...
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1answer
4k views

Clustering of Spatial Data in R or Python [closed]

I am new to GIS. Problem Domain :- I have a stoppage data of different vehicle i.e. the point where vehicle stopped.There are some specific vehicle which stops at some particular point. So, I am ...
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0answers
63 views

Create a correlation between different point dataset

I have different point data-sets in my map in ArcMap, but I am wondering if there is an tool in ArcMap that can analyze the correlation between the different data-sets. Specifically, I need to know ...
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2answers
571 views

What needs to be installed, to use ST_ClusterDBSCAN?

I have working PostgreSQL 9.5.3 with PostGIS. I have sucessfully created table and column with geom data type. I am able to execute geometry queries, namley ST_Transform without problem. # SELECT ...
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1answer
5k views

Clustering geographical data based on point location and associated point values

Given data points with longitude, latitude, and a third property value of this point. How can I cluster points into groups (geographical sub-regions) based on the property value? I searched by google ...
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38 views

Group location points that have a cumulative value 2000

I have a set of 400 locations (points) joined to a table having population attributes. I want to form groups of nearby locations such that the cumulative population is 2000, group can have maximum 15 ...
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1answer
2k views

Birch algorithm does not cluster as expected

I'm using Birch algorithm from scipy-learn Python package for clustering a set of points in one small city in sets of 10. I use following code: no = len(list_of_points)/10 brc = Birch(...
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1answer
866 views

Clustering markers using quadtree

I have a POSTGIS database with geography points and I want to cluster the points using quad-tree. I have a map where I have to display the markers clustered or non clustered depending on the zoom ...
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0answers
842 views

How to cluster point data into equal sized groups [closed]

I need to cluster point data into equal sized groups. I have 180 points and want to create 3 groups each containing 60 points. The groups should contain points which are close to each other. Is there ...
7
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1answer
634 views

Finding density centroids within polygons in PostGIS

I want to find the highest density of OpenStreetMap nodes within a dataset of census geometries. I want to tie the census data to the location of the node which is most central in terms of population. ...
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1answer
3k views

How to highlight leaflet marker cluster on mouse over?

Is there a way to highlight a leaflet marker cluster when mouse over as you can do for a simple marker? // ADD YOUR BASE TILES var baseLayer = L.tileLayer('https://dnv9my2eseobd.cloudfront.net/v3/...
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2answers
296 views

Clustering points in Lizmap?

I am testing Lizmap on a project where I display a high density of points from a point layer. Anyone knows a way to cluster the points in lizmap or qgis server? The idea is to end up with some ...
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1answer
2k views

How to create a heatmap with numbers using Leaflet map?

I wish to create a heatmap like this one at http://www.trulia.com/local/san-francisco-ca/tiles:1|points:1_crime With the number changes at different zoom level - the number can appear in a mouse-...
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1answer
829 views

Using FME to aggregate POI to one point

I want to aggregate points of interest (POI) using FME. The aggregation should make it possible to group all POI within an area based on a buffer distance from the centerpoint of n POI. This would ...
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2answers
2k views

creating clusters of points with same attributes

I have a file of some 4000 points, which belong to around 400 different categories (species of rare plants). I would like to remove duplicates within the categories (which could be repeated ...
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1answer
2k views

Spatial clustering with PostGIS including attributes

Spatial clustering with PostGIS including attributes I have a points table with some attributes like : year, type, etc. And I'd like to do a points clustering in PostGIS. I followed the subject in ...
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0answers
250 views

ESRI Cluster layer dynamic label colors

I am using extras/clusterlayer to render clusters for a uniquevalue renderer.. all that works well and good except that the label colors are all white/black/whatever you set them to.. I though I'd ...
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2answers
2k views

Simplify GeoJSON by retaining external boundaries (clustering)

I created a website (http://www.cartescolaire.paris) that basically loads a GeoJSON and displays it on a map using Leaflet. This geoJSON is pretty large (over 2 Mb), the loading time can be very long ...
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1answer
513 views

Cannot Add Machine to ArcGIS Server Cluster

After almost year of success, SQL database failed to register in ArcGIS Server. Traced problem to secondary/failover server in cluster. Deleted secondary server from cluster and database now ...
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1answer
229 views

Categorising Point Clusters

I have a point dataset of solar farm locations. The points are grouped according to which substation they feed into (see below). I would like to test the hypothesis that electrical output ...
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0answers
130 views

Defining regions with certain size using polygon layer as input in ArcGIS for Desktop? [closed]

I'm working with ArcGIS 10.3 and have a project where I'm trying to define how may breeding habitats of a species that can fit into a specified area. I have a polygon layer with suitable habitat in ...
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1answer
175 views

Plotting points conditionally using cluster number in qgis

I have a set of locations such that there are partitioned into five clusters, I used the categorized property under styles to differentiate points belonging to different clusters using different ...
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0answers
84 views

Mapping methodology and/or clustering technique needed [closed]

I have a scenario in which I have two service centers (A & B) in an area. The capacity of these service centers are different. Service Center A can serve twice as many as Service Center B. They ...
7
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2answers
3k views

How can I cluster all points in a postgis table together based on their distance from each other?

I have a PostGIS (in postgres 9.3) table which has Points. I want to figure out the "clusters" in the data. If 2 points are < X distance apart, they should be added to a cluster, and this should be ...
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0answers
602 views

Performing Grouping Analysis in QGIS? [duplicate]

Is there a QGIS tool that does the function of http://pro.arcgis.com/en/pro-app/tool-reference/spatial-statistics/grouping-analysis.htm MY NEED - I have about 15,000 points. I need them clustered in ...
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3answers
725 views

How to display geotagged photos in leaflet

There is awsome plugin of displaying geotagged photos in leaflet Photos on leaflet I used the picasa photos implimentation when I implemented the plugin for my picasa public album photos link in ...
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1answer
3k views

Grouping or Clustering Points that are within 45 miles of each other using ArcGIS Desktop?

I have a project in ArcGIS (ArcMap 10.2) where I want to identify naturally occurring dense spots of points and then form groups in that dense area, where points are within 45 miles of each other. ...
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1answer
359 views

why doesn't show feature on map

this is fiddle Link.Feature doesn't show on map when it has been like this code : var featureVectorLayer = new ol.layer.Vector({ source: featureClusterSource, style: new ol.style.Style({ ...
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1answer
490 views

Leaflet markercluster plugin also showing unclustered points

The following code displays clusters correctly. However, it also displays all the points as well as the clusters, which I don't want. What have I done wrong? Apologies that I cannot simplify the ...
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1answer
134 views

Call Toolbox operators of ENVI from IDL code

Is it possible to call the clustering/classification algorithms included in the toolbox of ENVI (gui) from IDL (source code) and how?
2
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1answer
913 views

Is it possible to show Leaflet Marker Cluster with JSON API?

I have a problem with displaying Leaflet Marker Cluster working with Leaflet-layerJSON. There are markers, but I cannot show the clusters. This works with GeoJSON, but now I have different data ...
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1answer
615 views

Algorithm for spatial clustering?

I have a series of 2D maps with values ranging 0.0 to 1.0 spread all over. The algorithm that produces them is an application of the fractional Brownian motion. Each map measures 101x101 pixels or ...
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1answer
654 views

Geoserver Clustering. where can i find activemqBroker.war?

I am completely new to clustering setup and I am following this tutorial to setup geoserver cluster. But I am stuck at "HOWTO configure ActiveMQ broker" step, problem is i cannot find this ...
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0answers
68 views

CartoDB: Center and zoom to stacked layer items/clusters with setView?

Is there any way to setView on a location with several layer items on top of each other? Mapbox example: http://www.zeit.de/zeit-magazin/2015/16/regional-einkaufen-deutschlandkarte Google Maps ...
2
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1answer
831 views

Group by Location within N Meters in PostGis

In PostGIS, given several Location objects, each of which looks something like this: { :id => 1, :latitude => 32.4196, :ll_point => "(-10111.1877176122, -5384086.44077608, ...
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1answer
362 views

How to merge two point feature classes based on spatial location using ArcPy?

I have two point feature classes, each containing about fifty points. These 2 point feature classes should be merged, or the points of feature class 2 added to feature class 1, as feature class 2 does ...
4
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1answer
281 views

Clustering Technique?

I have the following 9 clusters (each colour represent the appropriate cluster): I am looking for a clustering algorithm (if any) that would achieve "realistic" results. The data represents ...
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0answers
176 views

Modifying Cluster Analysis script in ArcGIS.com Incident Analysis template to add dissolve for other fields?

I have fiddled around with some of my data, especially a high-count (> 50,000) point data set of business locations. In small scale I have successfully used ESRI's Incident Analysis to cluster these ...

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