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

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1
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2answers
42 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 ...
1
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1answer
18 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 ...
1
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1answer
189 views

SAGA Cluster Analysis for grids projection issue

I am having an issue with the SAGA cluster analysis for grids tool within QGIS 2.4. I am actually taking this as an online class through Del Mar and we are going over supervised and unsupervised ...
0
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0answers
21 views

How to define a study area for Ripley's K analysis?

I have a spatial point pattern which spans across multiple districts in the country. Now I want to examine its pattern using Ripley's L function. I know that Ripley's L function is used for ...
0
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1answer
414 views

Updating cluster distance in OpenLayers 3?

I have a vector layer with clustering in OL3.4: cluster = new ol.layer.Vector({ source: new ol.source.Cluster({ distance: 20, source: some_geojson }), ...
1
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0answers
18 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 ...
1
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0answers
13 views

locate sample geo trace data

I'm working on a project where I need to form clusters of GPS coordinates that are separate from noisy geo-data points. I am using DBSCAN/OPTICS XI algorithms in R on randomly generated test data, but ...
0
votes
1answer
248 views

Create certain number of Clusters, equal sum of Z value

Divide polygons into *n* number of groups of equal counts with ArcGIS 10.2 is very similar to my question. But instead of equal number of polygons, I have multiple points (schools) with a z value ...
1
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0answers
18 views

cluster analysis dependent on avaliable area

I want to perform a cluster analysis based on a "background polygon". The polygon is not continuous, it represents coral colonies within a 10x10m reef area. Points represent disease locations on ...
3
votes
1answer
279 views

Cluster Markers with CartoDB

Is there an easy generic way to cluster Markers with CartoDB?
0
votes
1answer
251 views

How to I cluster by features in CartoDB?

I have a set of points for a number of buildings in NYC. I would like to group those points into clusters per their respective neighborhood (ex: Chelsea, Upper East Side etc.). Each of my points have ...
10
votes
1answer
227 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 = ...
1
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1answer
53 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 ...
2
votes
1answer
4k views

How to get Openlayers cluster strategy work for large data?

The map Layer has around 1500 points. I am able to display all the points in the map without any problem but adding the cluster strategy to the layer does not work. The Cluster strategy functions when ...
4
votes
1answer
354 views

How to cluster points into clusters of a maximum diameter in PostGIS?

I'm working with transit stops in GTFS. I want to group together stops (N~8000 for a medium sized agency in the USA) which are proximately related in order to reduce the number of dimensions but also ...
2
votes
0answers
41 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 ...
0
votes
2answers
108 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 ...
5
votes
0answers
98 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. ...
0
votes
1answer
48 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 = ...
1
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1answer
62 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 ...
0
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0answers
27 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 ...
15
votes
6answers
15k views

How to Create Animated Cluster Markers in OpenLayers/Leaflet?

I want to use Leaflet due to the smooth transitions which Openlayers seems like they can't match. I specifically require the ability to cluster markers with custom styled marker groups. The best ...
1
vote
1answer
39 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 ...
7
votes
2answers
91 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 ...
0
votes
2answers
269 views

iterate over cluster in markerCluster : leaflet

i need to iterate over all clusters that are currently present in markercluster using leaflet. there's a method called markercluster.getClusters() in googlemaps to do this job. is there something ...
2
votes
1answer
293 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 ...
21
votes
6answers
14k views

How to cluster spatial data in R?

I am very new to R. I have bunch of data points with latitude and longitude. I want to use R to cluster them based on their distance. I have already taken a look at this page and tried clustTool ...
1
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1answer
159 views

PostGIS Clustering. Group by geographic point location proximity

I have a table where i keep user's location history. The system gets user's current location each minute and writes it into "user_locations" table. Later on; when showing the locations that the user ...
2
votes
2answers
117 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 ...
4
votes
1answer
88 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 ...
0
votes
1answer
28 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 ...
1
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0answers
66 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 ...
27
votes
6answers
7k views

How to create a polyline-based “heatmap” from GPS tracks?

This winter I am planning to track my downhill skiing/snowboarding using a GPS. Most of my riding will occur at the same resort. I would like to be able to create a sort of "heatmap" that shows the ...
1
vote
4answers
2k views

Explode clusters of overlapping points in ArcGIS Javascript API

In my map application built on ESRI's javascript API there are a number of points that share a lat/long. I need a way to allow the user to see all of the points at a specific location by exploding ...
7
votes
6answers
7k views

How do I cluster XY point data? (ArcGIS 9.3)

I have a whole bunch of icons displaying on a map, I want these clustered together as was suggested to me for a different question here... ArcGIS 9.3. How do I increase Picture Marker Symbol ...
6
votes
1answer
87 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 ...
1
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0answers
38 views

How can I find define regions with a certain size with a polygon layer as input?

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 ...
3
votes
1answer
260 views

Maximize clusters of points from coordinate data

So I am definitely new to the GIS world, so bear with me if I don't know the best way to articulate my problem. That said, I am ready to learn, I would definitely welcome any direction that you all ...
5
votes
0answers
57 views

Mapping methodology and/or clustering technique needed

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 ...
2
votes
1answer
234 views

Clusters of points: Determining the centroid (QGIS)

I've basically got the same issue as this post, but can't find a way to transplant the ArcGIS solution to QGIS. I have household-level geo data for 10 villages spread out across the country. I need ...
65
votes
5answers
22k views

Spatial clustering with PostGIS

I'm looking for spatial clustering algorithm for using it within PostGIS-enabled database for point features. I'm going to write plpgsql function that takes distance between points within the same ...
2
votes
1answer
39 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 ...
0
votes
0answers
67 views

Geohash vs. Open Location Code

The target is to find all POIs within a given location on a specific zoom level. If the zoom level is high, I just want to get a number of POIs and at a certain zoom level I want to get all POIs. ...
6
votes
2answers
192 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 ...
7
votes
0answers
684 views

Grouping analysis of points to divide polygon into n number of sub-regions using QGIS?

I'm attempting to create n sub-regions from a polygon based on a cluster analysis of a bunch of overlapping raster layers (physical layers, eg: depth, currents, waves). Briefly, I can create a ...
2
votes
0answers
31 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 ...
0
votes
1answer
32 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?
1
vote
1answer
92 views

How to Group or Cluster Points that are within 45 miles of each other? in ArcGIS?

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. ...
2
votes
2answers
2k views

zoom to cluster onClick & have hover event

I've made a simple mock-up trying to combine two openlayers examples. I want to have clusters on which I can hover (so I can display an infowindow about it's content) and I want users to be able to ...
1
vote
1answer
96 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({ ...