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

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3
votes
2answers
987 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 ...
3
votes
1answer
100 views

Spatial Classification

I am not sure what to call my problem. From this image, I have a set of classified polygons (colored). I would like a way to classify the white polygons in the image. I don’t have any attributes to ...
3
votes
1answer
652 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. ...
3
votes
1answer
95 views

Is it possible to distinguish between points with the same coordinates?

I have several points with the same coordinates in one layer and of course they are located on top of each other. Is there a way to separate this points automatically (not manually)? I don't want to ...
3
votes
2answers
1k 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. ...
3
votes
1answer
1k views

How to cluster 2 datasets in Google Maps API V3?

I'd like to produce a map that shows thousands of Markers. I'm using Markersclusterer to show all these markers. Yesterday, I received another huge data set (completely different) and I'd like to see ...
3
votes
0answers
24 views

Algorithm for estimating position of many objects and differentiating those?

Let's assume a crowd-sourced tree location use case where a research team asks hikers to GPS the location of a specific tree type in case they encounter it. This will lead to a large number of ...
3
votes
0answers
108 views

Performing cluster analysis in R with Point Datasets

I am a R-Beginner, but I want to use it for some spatial statistics. I want to check the relation between the occurrence of ill persons and the existence of water in a area of interest. To give you a ...
3
votes
0answers
39 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 ...
2
votes
2answers
584 views

A lot of pointers to load on map-A better solution

I have to project a lot of points present in my Database say more than 100000. I heard that using geoserver is a better solution as it can render any number of points and from ...
2
votes
2answers
422 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 ...
2
votes
2answers
253 views

Is it possible to generate a heatmap on the server-side using ArcGIS Server?

Using ArcGIS Server's JS API it is possible to generate a heatmap at runtime, as in the example at http://tmappsevents.esri.com/website/heatmap/index.html This requires having client-side access to ...
2
votes
2answers
311 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 ...
2
votes
1answer
72 views

Do daytime Road Traffic Accidents (RTAs) have same spatial pattern as those of night?

With the following set of recorded data: Location of Road Traffic Accident (RTA) along 160km Expressway Date of accident Time of occurrence Causes of the accident etc What spatial analysis tool in ...
2
votes
2answers
82 views

Identify cluster centroids

I have a data set of points which are grouped into clusters like so: I'd like to use ArcGIS or Python to create a point layer of the centroids of each cluster but I can't seem to find the right ...
2
votes
2answers
232 views

Show different marker for cluster and icon for single vector features in OpenLayers

I have a vector layer which is geoJSON file containing school points and their attributes,to visualize this i defined cluster and show circle which size is based on the number of features it contains. ...
2
votes
1answer
2k 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
2answers
54 views

Methods for hot spot or cluster analysis for multiple measurements at the same geographic unit?

I would like to find geographic clusters of zip codes where each zip code has a measurement of a person's age (integer), sex (categorical/binary), and if they recovered from a certain medical ...
2
votes
1answer
226 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
1k 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 ...
2
votes
1answer
353 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 ...
2
votes
1answer
64 views

Matching two point clouds without loss (nearest neighbor, but more complicated)

I have two point clouds, one with demographic and one with electoral data. Points in both clouds represent the same empirical entity (say, a village, or an urban neighbourhood), but are not in the ...
2
votes
1answer
117 views

Fast Custering Algorithm for Geographic Data

I have been browsing through the net in my attempt to find a fast clustering algorithm to cluster geographic points, but lot many of the results found were for clustering algorithm in general and not ...
2
votes
2answers
875 views

How to merge/cluster smaller contiguous polygons to form larger ones?

Any help you can give an inexperienced college GIS user would be greatly appreciated. I am using both ArcGIS ArcMap 9.3 and 10 on desktop (i.e. not online), and the only info I can find on License ...
2
votes
2answers
425 views

Distribute ArcGIS services across multiple servers

What do you do when you have so many published services in ArcGIS that running even one instance of each service maxes out RAM/CPU? We've grown to the point where we have more published services than ...
2
votes
1answer
514 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 ...
2
votes
2answers
166 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
60 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 ...
2
votes
0answers
105 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 ...
2
votes
0answers
135 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
218 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 ...
2
votes
0answers
395 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 ...
1
vote
4answers
4k 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 ...
1
vote
2answers
148 views

Is there a Cluster convex hull implementation in OpenLayers?

In this leaflet example. When hovered over a cluster marker, it shows the bounding area of the clustered features which is known as convex hull. Is there a way to reproduce it with OpenLayers?
1
vote
2answers
514 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 ...
1
vote
1answer
254 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 ...
1
vote
1answer
110 views

Color region polygons according to cluster label

I want to present data on a map of our country. I have used R for showing the clusters on a country! Here the steps I took: setwd('D:/r/cluster2') channel <- odbcConnectExcel('cluster.xls') data ...
1
vote
1answer
37 views

How to compute drive access to a station based on vehicle origin points? [closed]

I have a shapefile that contains station locations and another shapefile that is the geocoded origins of those who drove to the station. I would like to make a buffer around the station that shows the ...
1
vote
1answer
459 views

Leaflet Marker Cluster: Popups won't open after first

I built a map using Leaflet and markercluster.js, and I'm having a strange issue where after I click on the first popup, I'm unable to open any other popup. This happens whether you close the first ...
1
vote
1answer
474 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
1answer
101 views

How to cluster similar lines in PostGIS?

In PostGIS I have a large database of linestrings which I have obtained using ST_makeline function. I would like to cluster similar lines based on where the lines start and end. Here is an example ...
1
vote
1answer
75 views

How to disperse clusters of proportional markers or polygons?

I am mapping a set of points in ArcMap that are symbolized using proportional marker symbols based on a numeric field value. The scale of the map has lead to alot of the point markers overlapping. ...
1
vote
1answer
119 views

How to better visualize features of clusters in Openlayers

I am using the cluster strategy for mapping a large number of features in Openlayers, now I would like to find a good solution for providing info about the features contained in a cluster selected by ...
1
vote
0answers
39 views

Monte Carlo test of Space-Time clustering in R

I have several point patterns representing the distribution of territories of a bird species. Each point pattern represents the distribution of one year. I already succeeded in computing Ripley's L ...
1
vote
1answer
61 views

How to use Leaflet Marker Cluster on markers from Leaflet-layerJSON (Overpass API)

I'm having troubles getting the Leaflet Marker Cluster working with Leaflet-layerJSON. I'm trying to make a Leaflet map with data from OpenStreetMap. The markers are showing on the map, but they are ...
1
vote
0answers
67 views

Performing Moran Test using R? [closed]

I’m very new to R so please Bear with me: I have a set of data containing AREA Infested for each region ! and I want to know if there are any spatial autocorrelation between the regions! Here a sample ...
1
vote
0answers
36 views

Getis-Ord GI and Moran's I when interested in clustering of data values not points

I have a dataset with many clustered (often coincident) points, each of which contains data. I am not interested in the fact that the points are obviously clustered. I would like to know whether the ...
1
vote
0answers
77 views

Leaflet marker cluster by Administrative boundary

Is it possible to perform clustering based on administrative boundary using the leaflet.markercluster plugin? How would I do that? I already have the boundary layer.
1
vote
0answers
120 views

Is it possible to cluster markers based on city name in Google Maps API

I have a requirement to display all the customers in map. Since the customer list is too large it looks messy when I place markers. I have tried the marker cluster functionality but it groups based ...
1
vote
0answers
53 views

How to Create Polygon shapefile based on change in point value?

Is there a function in ArcGIS that would take analyze the adjacent point or polygon based on percent difference. If the adjacent value is within less than the percent it would dissolve otherwise ...