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Showing content from https://developers.arcgis.com/javascript/latest/visualization/data-driven-styles/unique-types/ below:

Unique types | Overview | ArcGIS Maps SDK for JavaScript 4.33

USA freeways styled with a unique value renderer displaying freeway types

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)

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

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

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.

1. Create a Unique Value Renderer.
2. Reference the field name containing the classification values.
3. Create unique value info objects and assign a symbol to each expected value.
4. 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",
            },
          },
        ],
      };

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.

1. Create a unique value renderer.
2. Reference the field name containing the location type (e.g. museum, park, etc.).
3. 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",
            ),
          },
        ],
      };

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.

You can also use a class breaks renderer to accomplish the same visualization using numeric data.

1. Create a unique value renderer.
2. 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.
3. Create unique value info objects and assign a symbol to each expected value.
4. You can optionally add a default symbol to represent all features that don't have a matching value.

Arcade expression classifying the numeric data

Use dark colors for code blocks Copy

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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",
            },
          },
        ],
      };

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.

1. Create different symbols for each building type.
2. Assign the symbols to a unique value renderer.
3. 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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