Tagged Questions

Assembling nearby data points into groups

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7
votes
2answers
148 views

How do I group near points with GPS positions?

I'm an IT person so I don't know too much about projections and so on, I hope you can help me. I have made an application for Android that collects a GPS position, so I have the latitude and the ...
5
votes
2answers
113 views

R packages for deriving spatial clusters from origin-destination matrix

I have a matrix of origin-destination flows and I am trying to figure out the best way to derive X number of functional spatial clusters from the data. I haven't done this particular type of analysis ...
0
votes
0answers
55 views

Getting “pointer” cursor at mouseover for rules/symbolizers based clusters in OpenLayers

I successfully used the AnimatedCluster plugin for OpenLayers. My codes uses OpenLayers.Rules and symbolizers. How can I get a "pointer" like mouse cursor when hovering over a cluster of features? My ...
0
votes
1answer
26 views

OpenLayers Clustering Adds Features to Selected Features Array on Zoom

This is my first posted question despite using StackExchange for a few years now. I've been stuck for quite some time trying to figure out this issue with OpenLayers. The problem is as follows: I ...
2
votes
0answers
47 views

Installing knn on PostgreSQL for windows

I am trying to install the extension KNN for clustering as an extension on my PostgreSQL database. I have downloaded the file http://www.pgxn.org/tag/analysis I found instructions on how to ...
0
votes
0answers
21 views

openlayers clustering alternative

Is there some alternative to group features in OpenLayers? My goal is to speed-up the process of rendering. Clusters allow to do that a bit faster than rendering just plain features. So, any ...
11
votes
8answers
6k 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 ...
3
votes
0answers
28 views

Clustering driven by an enum/list

Given a set of 2D points ( or vertices if you want ), the values stored for each point are: coordinate on x coordinate on y an enum or a value from a list in general for the sake of this example ...
5
votes
3answers
687 views

Server side clusterer for Google Maps

After doing a lot of research on different types of clustering coordinates (server side) I am still having problems with choosing the best approach for my project. My requirements: Ability to work ...
9
votes
1answer
94 views

Natural neighborhoods terminology

Sometimes the hardest part of an analysis is knowing what something is called. What are some R packages, but more importantly, terminology I should be searching for to define contiguous city ...
5
votes
3answers
268 views

How to update feature positions with clustering in OpenLayers?

I have an OpenLayers 2.12 map with a vector layer with a cluster strategy. All the static behavior is how I want it. Now I'd like to add the possibility to update the features' position. I do this ...
2
votes
0answers
93 views

Geoserver Clustering Problems

I have problems setting up a clustered Geoserver. So far got four instances (version 2.2.4) running on a ubuntu linux box with a shared data directory behind HAProxy. I use one of the geoservers to ...
1
vote
1answer
89 views

openlayers cluster strategy - exhibiting custom icons for clusters of 1 feature

i have a page that displays a vector layer imported from a kml file (basically like the the sundials example). it works perfectly well, both using fixed strategy ONLY, as well as using both fixed and ...
1
vote
2answers
290 views

How to use Leaflet marker clustering with image map only?

I have image map of one state, where I would like to put about 100 markers. Is it possible to use only one image map instead of CloudMade tiles Leaflet usually uses? So, I need only that image to be ...
3
votes
0answers
70 views

How to cluster features based on their proximity?

I have around 500 features (Forests) that I want to cluster based on their proximity, and then work with those clusters. I only have the ID, and shape area of those features. How can I cluster them?
2
votes
1answer
667 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 ...
9
votes
1answer
131 views

Compare spatial cluster/agglomeration patterns for polygon data

I have agricultural data in form of polygons which I would like to test for spatial clusterings/spatial agglomerations. All in all I have about 40 variables which I can aggregate and standardize in ...
11
votes
1answer
244 views

How do I create groups of points from lat/long pairs?

I have a database which contains Lat/Long pairs to identify the location of points of interest. I would like to group the points of interest into groups of 10. The group should be geographically ...
10
votes
4answers
2k views

Clustering Trajectories (GPS data of (x,y) points) and Mining the data

I've got 2 questions on analyzing a GPS dataset. 1) Extracting trajectories I have a huge database of recorded GPS coordinates of the form (latitude, longitude, date-time). According to date-time ...
16
votes
3answers
616 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 ...
4
votes
1answer
195 views

Self organizing maps and spatially Constrained Clustering in R

There are a few algorithms to perform spatial clustering in R but most of them focus on point pattern analysis (for example here). I would like to perform spatial constrained clustering for polygon ...
2
votes
1answer
170 views

Clustering not working on features in OpenLayers

I've built a mapping solution using OpenLayers that works well except I can't get the points to cluster. I've looked at the examples on the site, and I've even implemented those examples in my ...
1
vote
1answer
124 views

Server side clustering - cluster (feature) geometry

I am trying to implement server side clustering and show it using OpenLayers. I am using this good material as an example. As a clustering result, a get some list of features, some of them are ...
6
votes
1answer
188 views

Plotting 1M+ intensity reading as custom shapes with Google Maps

I currently have a database (Mongo, atm) holding roughly 1M points of data corresponding lat/lon/intensity values that I'd like to plot over a region using the Google Maps API. Ideally, I'd like to ...
0
votes
0answers
68 views

How to use symbol center with markercluster?

Am using markercluster.js for showing cluster using img urls for cluster size that.mcOptions = [{ height: 38, url: "/images/search/hotels/clusterSmall.png", ...
4
votes
0answers
85 views

How to Perform a Grouping Analysis of Points to Divide a Polygon into n Number of Sub-Regions?

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 ...
11
votes
1answer
160 views

Spatial analysis and clustering near features

Im working on marking behaviour in group living animals and im interested in how marking behaviour is affected by certain characteristics of the neighbouring groups. I have plotted the territories of ...
1
vote
1answer
124 views

OpenLayers AnimatedCluster delete all features

I am using OpenLayers.Strategy.AnimatedCluster in my application in order to cluster and show points to the end-user. The example is here. All points are located in concrete vector layer. I need to ...
0
votes
0answers
106 views

Generating vector data (points) for OpenLayers Animated Cluster Strategy

In my web application I am going to use OpenLayers.Strategy.AnimatedCluster strategy due to the fact that I need to visualize a great amount of point features. Here is a very good example of what it ...
0
votes
0answers
105 views

Openlayers cluster strategy: zoom to layer (WFS) extent

For some reason, when I enable the cluster strategy the zoom to layer behavior is zooming to the first cluster in the layers features array, rather than the whole layer data extent. I tried (with no ...
2
votes
2answers
423 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 ...
12
votes
3answers
275 views

How to determine if trees within forest gaps are clustered?

The attached dataset shows approximately 6000 saplings in approximately 50 variable sized forest gaps. I am interested in learning how these saplings are growing within their respective gaps (i.e. ...
5
votes
2answers
147 views

What are my options for Server side clustering using open source GIS tools?

I need to make a webapp that will show over 40K Points on a map. These points are all across the globe. Using WFS Service and OpenLayers, it is possible to do clustering on small set of points, but ...
2
votes
2answers
90 views

Remove duplicate names in FeaturePopups cluster tooltips and popups

I am using FeaturePopups control to show tooltips and popups for clusters. I have features connected (ends of road segments) with the same names. Is it possible to remove them from tooltips and ...
2
votes
1answer
104 views

How to not overlap cluster popups with FeaturePopups control?

FeaturePopups control resolve the problem of cluster popups, but there is a small design problem in my opinion: the event popup have the same anchor as the cluster popup and they partial or total ...
2
votes
0answers
208 views

how to show information window for the marker cluster

This is my markercluster code : i need information window for the markercluster icon as well as marker icon, i have another cluster.js file, can some one please tell me how can i show the information ...
30
votes
3answers
5k 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 ...
10
votes
1answer
111 views

Stratified OpenLayers Clustering

I have an OpenLayers map with point clustering, but I want to apply a much finer granularity to the data represented in the map. Specifically, I want to stratify the clusters according to an ...
8
votes
1answer
3k views

Using Drop Markers and MarkerClusterer together?

I want to create a rather visually appealing representation of time-series data (Costco Store Locations w/ opening dates). My idea was to plot them on a map, in time-series, but it seems that the ...
5
votes
1answer
264 views

create convex hull polygons / cluster for sets of N points in a point dataset

I have 50k points in a feature class which I need to build convex hull or polygon for each set of 50 points that are nearby each other. I guess the question is very similar to create census areas for ...
3
votes
1answer
298 views

toggle clustering with map controls

I've made a map with openlayers and have the vector features clustered with a clustering strategy. Now I want my users to be able to toggle this behaviour with a control similar to the layerswitcher. ...
7
votes
2answers
2k views

How to cluster Google Maps kml overlay

I have several thousand markers stored in a kmz file that I load into a Google Maps (v3 API). I've looked around to find a way to cluster the overlay data, but to no avail. MarkerClusterer looks ...
2
votes
1answer
180 views

Clustering Point for StatePlane WKID 2236

Does anyone have an example to point me in the right direction to utilize Clustering with the ESRI JS API working with a State Plane wkid: 2236? I want to provide a solution for an internal ...
0
votes
0answers
78 views

QuantumGIS or Matlab package for distribution- or density-based clustering

Does anybody know if there exists any package for either QuantumGIS or Matlab for distribution- or density-based clustering to be used with vector point data?
1
vote
1answer
466 views

Dynamically adding features with cluster strategy

I am trying to dynamically add features to a vector layer, and use cluster strategy to group those features accordingly. I am able to do this for the first set of data that gets loaded on the map. ...
17
votes
5answers
2k views

How to identify clusters in vector point data?

I have a vector dataset of rural broadband data-points (how fast, etc.) and I'd like to explore if there are clusters of points with similar characteristics, and to plot polygons encompassing them. ...
10
votes
3answers
507 views

How can I generate irregular grid containing minimum n points?

Given a large (~ 1 million) sample of unevenly distributed points - is it possible to generate irregular grid (in size, but could also be irregular in shape if that is possible?) that will contain ...
1
vote
4answers
1k views

Prevent drawing of overlapping point symbols - ArcGIS Server/Javascript API

Is there any way in ArcGIS to prevent symbols from being drawn when they overlap each other? I know this is possible for Labels using Placement Properties/Label Weight, but I can't seem to find ...
10
votes
3answers
2k views

How to cluster spatial data in R?

I am very new to R, so please bear with me : > 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 ...
3
votes
1answer
196 views

How to access the icon of a feature retrieved from text in a vector-layer?

I`m using OpenLayers to show POIs on a map. These POIs are loaded from a textfile and I`m using a Vector Layer to get it onto the map - works great. Now I want to use the cluster strategy to have ...

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