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Unique value rendering

Unique value rendering can be used to symbolize layers that allow configuration of symbology. This includes ArcGIS Server feature layers, geoRSS layers, graphics layers, and SharePoint lists. For more information on the different layer types and their capabilities, see Layer types.

About unique values

Unique values are sets of values in which each is unique for a particular field or attribute within a given set of data. For example, if a set of data has a field called STATE_NAME that has values { Washington, Washington, Washington, Montana, Connecticut, Connecticut, Connecticut, Florida, Oklahoma, Oklahoma }, the set { Washington, Montana, Florida, Oklahoma } would be a valid set of unique values. Notice that within the set of unique values, no values are repeated. A unique value renderer maps a set of unique values to a set of symbols.

As an example, suppose you have a buildings layer with an attribute that specifies how each building is zoned. To symbolize the buildings differently based on the zoning of each, you could define a unique value renderer that specifies a yellow symbol for residential, purple for industrial, blue for commercial, and so on, for every zoning classification.

Once you have configured the unique values renderer for a layer, use either the Color Scheme drop-down menu or the Scheme Options dialog box to apply a color scheme.

Configuring a unique values renderer

The ArcGIS Map Web Part allows you to apply unique value rendering to a layer. To do so, complete the following steps:

  1. Select the desired layer on the Map Contents panel.
  2. On the Symbols tab of the ribbon, expand the Renderer drop-down menu and choose Unique Values:
    Unique Values selection on Renderer drop-down menu
  3. Expand the Attribute drop-down menu and choose the desired field:
    Attribute drop-down menu

Color scheme drop-down menu

You can apply a predefined color scheme to the renderer by clicking Color Scheme on the ribbon and choosing the desired color scheme from the list that appears:

Color Scheme menu

The color scheme is applied differently depending on the geometry type of the selected layer:

  • For a polygon layer, the colors are applied to the fill colors of the polygons.
  • For a line layer, the colors are applied to the colors of the lines.
  • For a point layer, the color is applied to the selected point symbol. Colors are not applied to picture symbols.

Scheme options dialog box

Options for modifying unique values are provided on the Scheme Options dialog box. Click Scheme Options on the Symbols tab of the ribbon:

Scheme Options
The Scheme Options dialog box appears.
Scheme Options dialog box
  • Changing the renderer and attribute—As with the drop-down menus on the ribbon, the Renderer and Attribute drop-down menus on the dialog box can be used to change the renderer and attribute, respectively.
  • Changing the color scheme—Just as you can on the ribbon, you can choose a color scheme from the Scheme Options dialog box. To do so, choose the desired scheme from the Color Scheme list.
    Color Scheme list
  • Selecting a value's symbol—To specify the symbol for one value, click the symbol to the left or the arrow to the right of the value and choose the desired symbol from the symbol picker.
    Symbol picker
  • Modifying a value's symbol—To modify the symbol used by a value, select the value from the right side of the dialog box and use the controls in the Current Symbol section of the dialog box to adjust the symbol's size, color, and transparency.
  • Adding or removing values—While the ArcGIS Map Web Part automatically determines the unique values that are present in a layer, you also can manually add or remove values. You might want to add values that are not present in the data, for instance, if you are using a Map Web Part to monitor a set of data that you know will increase. Alternatively, you might want to remove values to prevent features with certain values from being displayed on the map. To add a value, type the desired value into the Edit Values text box and click Add. To remove a value, choose the value from the right side of the dialog box and click Remove.