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

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1answer
2k 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
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0answers
169 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
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1answer
574 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 ...
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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
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2answers
875 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
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1answer
583 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"} ...
22
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6answers
863 views

What tools for regionalization/redistricting can you recommend?

I am looking for tools for regionalization / districting in GIS. So far I have been able to identify Districting ArcGIS extension (now also online) REDCAP (currently limited to 50k input polygons) ...
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1answer
692 views

creating clusters of point data

I have a map of stores for a retailer. I am trying to form clusters (of these stores) such that each member of a cluster is at most 5km away from any other member and any non-member is at least 10 km ...
7
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1answer
179 views

Finding largest number of observations within a given radius

I have the following problem: Given the location of insured properties (say houses with fire insurance), i have to find the largest sum of insured values which fit into a 300m radius. Now, my first ...
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3answers
1k views

Best practices for visualising clustered features in web maps?

I'm looking for the best symbol to display clustered features in the ArcGIS Server JS API. I don't like the "fly-out" animated cluster symbol, as used in the Silverlight API clustering or the JS ...
7
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3answers
912 views

How to cluster points based on a kernel density?

I have a large dataset with 36k points representing commercial land uses, each with a field containing the square footage. I have run a kernel density analysis on this dataset, producing a raster ...
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2answers
579 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 ...
7
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3answers
396 views

How do I figure out if there are clusters of one set of points around another set of points from a different layer?

I want to see if there is clustering of a certain type of buildings (x) around another type of buildings (y). The two point files are in different layers. I cannot figure out which tool I would use to ...
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6answers
5k 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 ...
4
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3answers
1k views

Need to create a collection of polygons from a collection of points

I have a set of points, which are spread over a wide geographical area. I need to be able to create a set of polygons which best represent the clustered points. In parts, some points may simply lie ...
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2answers
775 views

how to cluster points of interest by lat lon for my WP7 app

I have alread asked this question on SO, so I appologies if duplicating this is bad form. I will link to each of the sites if I get the right answer... ...
7
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5answers
2k views

Algorithm to find polygons enclosing points

I'm trying to find an algorithm that can determine the smallest possible polygons to cover a number of points. I know how to get the convex hull around all the points, but say that the points are ...
7
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2answers
1k views

Spatial statistics tools : clustering analysis on raster data

I've an apparently simple problem, but i can't find a clear methodology to use. I'm tasked to delimit "urban areas" by vector convex polygons, using the Gridded Population of the World dataset from ...
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2answers
1k views

Incremental spatial clustering algorithm

I'm in search of a incremental spatial clustering algorithm. Here is my use case: users create entries with an initial position users may change the positions of existing entries I now want to ...