Find point clusters

What is a cluster analysis?

A cluster analysis is the process of finding clusters of point features within surrounding noise at a specified distance. To execute the analysis, use the spatial analysis service and the FindPointClusters operation.

Real-world examples of this analysis include the following:

• Where are there clusters of traffic incidents?
• Where are there clusters of instect infestations?
• Where are there clusters of trees?

How to perform a point cluster analysis

1. Review the parameters for the FindPointClusters operation.
2. Send a request to get the spatial analysis service URL.
3. Execute a job request with the following URL and parameters:
   • URL: https://<YOUR_ANALYSIS_SERVICE>/arcgis/rest/services/tasks/GPServer/FindPointClusters/submitJob
   • Parameters:
     • analysisLayer: Your dataset as a hosted feature layer or feature collection.
     • minFeaturesCluster: Define how many points constitute a cluster.
     • outputName: A string representing the name of the hosted feature layer to reutrn with the results.
4. Check the status.
5. Get the output layer results.

To see examples using ArcGIS API for Python, ArcGIS REST JS, and the ArcGIS REST API, go to Examples below.

URL request

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http://<YOUR_ANALYSIS_SERVICE>/arcgis/rest/services/tasks/GPServer/FindPointClusters/submitJob?<parameters>

Required parameters

Key parameters

Example

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analysisLayer = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Traffic_Crashes/FeatureServer/0"

results = find_point_clusters(
    analysis_layer=analysisLayer,
    min_features_cluster=500,
    #Ouputs results as a hosted feature service.
    output_name="Find point clusters results",
)

result_features = results.layers[0].query()

print(
    f"The find point clusters layer has {len(result_features.features)} new records"
)

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POST arcgis.com/sharing/rest/portals/self HTTP/1.1
Content-Type: application/x-www-form-urlencoded

&f=json
&token=<ACCESS_TOKEN>

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{
  "helperServices": {
    // Other parameters
    "analysis": {
      "url": "https://<YOUR_ANALYSIS_SERVICE>/arcgis/rest/services/tasks/GPServer"
    },
    "geoenrichment": {
      "url": "https://geoenrich.arcgis.com/arcgis/rest/services/World/GeoenrichmentServer"
    }
  }
}

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POST <YOUR_ANALYSIS_SERVICE>/arcgis/rest/services/tasks/GPServer/FindPointClusters/submitJob HTTP/1.1
Content-Type: application/x-www-form-urlencoded

&f=json
&token=<ACCESS_TOKEN>
&analysisLayer={"url":"https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Traffic_Crashes/FeatureServer/0","name":"Traffic Crashes"}
&minPointClusters=500
&outputName={"serviceProperties":{"name":"Find point clusters results"}}
&context={}

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{
  "jobId": "<JOB_ID>",
  "jobStatus": "esriJobSubmitted",
  "results": {},
  "inputs": {},
  "messages": []
}

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POST <YOUR_ANALYSIS_SERVICE>/arcgis/rest/services/tasks/GPServer/FindPointClusters/jobs/<JOB_ID> HTTP/1.1
Content-Type: application/x-www-form-urlencoded

&f=json
&token=<ACCESS_TOKEN>

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// Executing job
{
  "jobId": "<JOB_ID>",
  "jobStatus": "esriJobExecuting",
  "results": {},
  "inputs": {},
  "messages": []
}
// Job succeeded
{
  "jobId": "<JOB_ID>",
  "jobStatus": "esriJobSucceeded",
  "results": {
      "pointClustersResultLayer": {
          "paramUrl": "results/pointClustersResultLayer"
      },
  },
  "inputs": {},
  "messages": []
}

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POST <YOUR_ANALYSIS_SERVICE>/arcgis/rest/services/tasks/GPServer/FindPointClusters/jobs/<JOB_ID>/results/outliersResultLayer HTTP/1.1
Content-Type: application/x-www-form-urlencoded

&f=json
&returnType=data
&token=<ACCESS_TOKEN>

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{
  "paramName": "pointClustersResultLayer",
  "dataType": "GPString",
  "value": {
      "url": "<SERVICE_URL>",
      "itemId": "<ITEM_ID>"
  }
}

Tutorials

Learn how to perform related analyses interactively with Map Viewer and programmatically with ArcGIS API for Python, ArcGIS REST JS, and ArcGIS REST API.

Discover patterns in data

Find patterns and trends in data using spatial analysis operations.

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