Override cluster symbol

Explore in the sandboxView live

This sample demonstrates how to override the default cluster symbol when clustering is enabled on a GeoJSONLayer. Clustering is a method of reducing features in a FeatureLayer, CSVLayer, GeoJSONLayer, WFSLayer, or OGCFeatureLayer by grouping them based on their spatial proximity to one another. Typically, clusters are proportionally sized based on the number of features within each cluster.

Clustering is configured in the featureReduction property of the layer. The feature reduction property gives you control over many cluster properties, including the cluster symbol. This allows you to retain the layer's renderer for styling individual features, but visually indicate clusters with a dedicated symbol.

Configure cluster symbol
Use dark colors for code blocksCopy
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
        const clusterConfig = {
          type: "cluster",
          clusterRadius: "100px",
          popupTemplate: {
            title: "Cluster summary",
            content: "This cluster represents {cluster_count} earthquakes.",
            fieldInfos: [
              {
                fieldName: "cluster_count",
                format: {
                  places: 0,
                  digitSeparator: true
                }
              }
            ]
          },
          clusterMinSize: "24px",
          clusterMaxSize: "60px",

          symbol: {
            type: "simple-marker",
            style: "circle",
            color: "#69dcff",
            outline: {
              color: "rgba(0, 139, 174, 0.5)",
              width: 6
            }
          },

          labelingInfo: [
            {
              deconflictionStrategy: "none",
              labelExpressionInfo: {
                expression: "Text($feature.cluster_count, '#,###')"
              },
              symbol: {
                type: "text",
                color: "#004a5d",
                font: {
                  weight: "bold",
                  family: "Noto Sans",
                  size: "12px"
                }
              },
              labelPlacement: "center-center"
            }
          ]
        };