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.

Code examples

Categorical data

This example demonstrates how to visualize categories using a string 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.

ArcGIS Maps SDK for JavaScript

ArcGIS Maps SDK for .NET

ArcGIS Maps SDK for Kotlin

ArcGIS Maps SDK for Java

ArcGIS Maps SDK for Swift

ArcGIS Maps SDK for Qt

ArcGIS Maps SDK for Flutter

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      const hwyRenderer = {
        type: "unique-value",
        legendOptions: {
          title: "Freeway type",
        },
        defaultSymbol: otherSym,
        defaultLabel: "Other",
        field: "RTTYP",
        uniqueValueInfos: [
          {
            value: "I", // code for interstates/freeways
            symbol: fwySym,
            label: "Interstate",
          },
          {
            value: "U", // code for U.S. highways
            symbol: hwySym,
            label: "US Highway",
          },
          {
            value: "S", // code for State highways
            symbol: stateSym,
            label: "State Highway",
          },
        ],
      }

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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.

First, write an Arcade expression to classify the data into ordinal categories: low, medium, and high.

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      var traffic = $feature.AADT;
      When(
        traffic > 80000, "High",
        traffic > 20000, "Medium",
        "Low"
      );

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Create a unique value renderer.
Reference the Arcade expression in the valueExpression property.
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.

ArcGIS Maps SDK for JavaScript

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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 the type of building: 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.

ArcGIS Maps SDK for JavaScript

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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" },
            },
          ],
          value: "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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