Unique types

USA freeways styled with a unique value renderer displaying freeway types

What is a unique types style?

A unique types style assigns distinct symbols to unique data values returned from a field or expression in a layer. You can use this style to visualize what something represents, such as:

Show points of interest on a map (e.g. schools, parks, places of worship)
Represent categories of data (e.g. regions, types)
Visualize ordinal data (e.g. high, medium, and low)

How a unique types style works

This style is configured with a Unique Value Renderer. This renderer requires the following:

A reference to a data value either from a field name, or an Arcade expression.
A list of unique value infos that match a unique symbol with an expected value returned from the field or expression.

Examples

Categorical data

This example demonstrates how to visualize categories using a string attribute value. The app visualizes freeways based on their classification: interstate, state highway, or U.S. highway.

Create a Unique Value Renderer.
Reference the field name containing the classification values.
Create unique value info objects and assign a symbol to each expected value.
You can optionally add a default symbol to represent all features that don't have a matching value.

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        const hwyRenderer = {
          type: "unique-value",
          legendOptions: {
            title: "Freeway type"
          },
          field: "RTTYP",
          uniqueValueInfos: [{
            value: "S",
            label: "State highway",
            symbol: {
              type: "simple-line",
              color: "#e6d800",
              width: "6px",
              style: "solid"
            }
          }, {
            value: "I",
            label: "Interstate",
            symbol: {
              type: "simple-line",
              color: "#e60049",
              width: "6px",
              style: "solid"
            }
          }, {
            value: "U",
            label: "US Highway",
            symbol: {
              type: "simple-line",
              color: "#9b19f5",
              width: "6px",
              style: "solid"
            }
          }]
        };
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Points of interest (3D)

This example demonstrates how to visualize points of interest (POI) in a 3D scene. This demo shows how to create POI symbols with a PictureMarkerSymbol. You can also use web styles to create the same visualization.

Create a unique value renderer.
Reference the field name containing the location type (e.g. museum, park, etc.).
Create unique value info objects and assign a symbol to each expected value.

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        // Expand the code above to view how each marker
        // symbol is created in getUniqueValueSymbol()
        const pointsRenderer = {
          type: "unique-value",
          field: "Type",
          uniqueValueInfos: [
            {
              value: "Museum",
              symbol: getUniqueValueSymbol("https://developers.arcgis.com/javascript/latest/sample-code/visualization-point-styles/live/Museum.png", "#D13470")
            },
            {
              value: "Restaurant",
              symbol: getUniqueValueSymbol("https://developers.arcgis.com/javascript/latest/sample-code/visualization-point-styles/live/Restaurant.png", "#F97C5A")
            },
            {
              value: "Church",
              symbol: getUniqueValueSymbol("https://developers.arcgis.com/javascript/latest/sample-code/visualization-point-styles/live/Church.png", "#884614")
            },
            {
              value: "Hotel",
              symbol: getUniqueValueSymbol("https://developers.arcgis.com/javascript/latest/sample-code/visualization-point-styles/live/Hotel.png", "#56B2D6")
            },
            {
              value: "Park",
              symbol: getUniqueValueSymbol("https://developers.arcgis.com/javascript/latest/sample-code/visualization-point-styles/live/Park.png", "#40C2B4")
            }
          ]
        };
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Ordinal data

This example demonstrates how to create ordinal categories from a numeric field attribute using an Arcade expression. This app classifies highways by low, medium, or high truck traffic.

Create a unique value renderer.
Write an Arcade expression to classify the data into ordinal categories: low, medium, and high. Then reference it in the valueExpression property. See the snippet below.
Create unique value info objects and assign a symbol to each expected value.
You can optionally add a default symbol to represent all features that don't have a matching value.

Arcade expression classifying the numeric data
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      var traffic = $feature.AADT;
      When(
        traffic > 80000, "High",
        traffic > 20000, "Medium",
        "Low"
      );

Reference the Arcade expression in the valueExpression property
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        const renderer = {
          type: "unique-value",
          valueExpression: `
            var traffic = $feature.AADT;
            When(
              traffic > 80000, "High",
              traffic > 20000, "Medium",
              "Low"
            );
          `,
          valueExpressionTitle: "Traffic volume",
          uniqueValueInfos: [{
            value: "High",
            symbol: {
              type: "simple-line",
              color: "#810f7c",
              width: "6px",
              style: "solid"
            }
          }, {
            value: "Medium",
            symbol: {
              type: "simple-line",
              color: "#8c96c6",
              width: "3px",
              style: "solid"
            }
          }, {
            value: "Low",
            symbol: {
              type: "simple-line",
              color: "#9d978b",
              width: "1px",
              style: "solid"
            }
          }]
        };
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Categorical data (3D)

This example visualizes buildings based on building type: residential, commercial or mixed use. A unique value renderer assigns a color to each building based on the building's usage attribute.

Steps

Create different symbols for each building type.
Assign the symbols to a unique value renderer.
Assign the renderer to the scene layer.

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        const typeRenderer = {
          type: "unique-value",
          legendOptions: {
            title: "Building Type"
          },
          defaultSymbol: {
            type: "mesh-3d",
            symbolLayers: [
              {
                type: "fill",
                material: { color: "#FFB55A", colorMixMode: "replace" }
              }
            ]
          },
          defaultLabel: "Others",
          field: "landuse",
          uniqueValueInfos: [
            {
              value: "MIPS",
              symbol: {
                type: "mesh-3d",
                symbolLayers: [
                  {
                    type: "fill",
                    material: { color: "#FD7F6F", colorMixMode: "replace" }
                  }
                ]
              },
              label: "Office"
            },
            {
              value: "RESIDENT",
              symbol: {
                type: "mesh-3d",
                symbolLayers: [
                  {
                    type: "fill",
                    material: { color: "#7EB0D5", colorMixMode: "replace" }
                  }
                ]
              },
              label: "Residential"
            },
            {
              value: "MIXRES",
              symbol: {
                type: "mesh-3d",
                symbolLayers: [
                  {
                    type: "fill",
                    material: { color: "#BD7EBE", colorMixMode: "replace" }
                  }
                ]
              },
              label: "Mixed use"
            },
            {
              value: "MIXED",
              symbol: {
                type: "mesh-3d",
                symbolLayers: [
                  {
                    type: "fill",
                    material: { color: "#B2E061", colorMixMode: "replace" }
                  }
                ]
              },
              label: "Mixed use without residential"
            }
          ]
        };
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