Assembling nearby data points into groups
0
votes
0answers
52 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 ...
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 ...
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 ...
5
votes
2answers
112 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 ...
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 ...
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 ...
7
votes
2answers
146 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 ...
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
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 ...
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 ...
9
votes
1answer
130 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 ...
4
votes
1answer
192 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 ...
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
84 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 ...
1
vote
2answers
289 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 ...
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
121 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
104 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
104 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 ...
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. ...
16
votes
3answers
614 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 ...
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
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
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 ...
5
votes
3answers
266 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 ...
10
votes
1answer
109 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 ...
3
votes
1answer
295 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.
...
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 ...
2
votes
2answers
421 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 ...
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.
...
2
votes
1answer
660 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 ...
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 ...
5
votes
1answer
262 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 ...
10
votes
3answers
503 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 ...
3
votes
1answer
195 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 ...
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 ...
0
votes
1answer
172 views
How to cluster kml features in OpenLayers
Is it possible to cluster KML features in OpenLayers, and are there any samples?
I can find separate samples for clusters and KML but nothing which handles both together.
Thanks
1
vote
0answers
212 views
Cloudmade Web Maps API Marker Clustering problem
I've just started learning Cloudmade Web Maps API. I'm at marker clustering, and I'm facing a strange problem; whenever I try accessing the page below, content of elements must consist of well-formed ...
2
votes
2answers
214 views
Merge nearby items into a single representation
I'm investigating OpenLayers and I'm trying to see if it's possible to filter down the number of displayed feature items.
Is it possible to display many nearby items as a single point item on a map ...
6
votes
1answer
484 views
Grouping map points into fixed cluster sizes
I have a dataset of 655 lat/long pairs which I'd like to split into about 100 groups. A group should have 5-10 pairs which are geographically close to each other. Dense groups should have more ...
1
vote
1answer
1k views
Google Maps MarkerClusterer - Remove all clusters
So, I have a PostGreSQL DB with 317 datapoints - all spatially enabled through PostGIS. I have queried this using PHP as GeoJSON and overlaid it on Google Maps (using a converting routine). I have ...
1
vote
0answers
124 views
How Do I Capture when the Cluster Rendering is Completed
I have a graphics layer that draws clusters using the sample custom cluster from ESRI. http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#CustomClusterer
We have a Busy Indicator that we ...
7
votes
1answer
411 views
Appropriate distance metric for spatial clustering of geographic coordinates
I have a set of locations in geographic coordinates, and I would like to group the points using hierarchical clustering followed by tree-cutting at various "heights" in order to calculate group-wise ...
3
votes
2answers
522 views
How to group points into a user-provided number of clusters?
I am looking for a process in ArcGIS that takes a point feature class and groups the points into a user-provided number of clusters. I am working in ArcGIS but I'd welcome any suggestions that ...
4
votes
1answer
509 views
Openlayers: Clustering in Openlayers.Layer.Text
I have a map that displays 5 layers of markers. Each layer is a group of POI's. I load the POIs from textfiles using
var cycling = new OpenLayers.Layer.Text( "Cykling", { location:"./textfile.txt"} ...
