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Symbolize stream layers

Stream layers display a live feed of streaming data. You display and symbolize stream layers in the same way as other feature layers. When a stream layer is track aware, you can symbolize previous observations independently from current observations.

Symbolize your stream layers

You can symbolize stream layers with single symbol, unique values, graduated symbols, or graduated colors symbology. As with standard feature layers, the choice depends on the type of data you have, how it's attributed, and what you want to show. You can even modify this symbology with additional variation in color, size, rotation, or transparency based on attributes or an expression.

  1. Select a stream layer in the Contents pane.
  2. Under Stream Layer on the Appearance tab in the Drawing group, click Symbology Symbology.
  3. In the Symbology pane, on the Primary Symbology tab Primary symbology, choose a symbology option from the Primary Symbology menu.
    • Single Symbol—Apply the same symbol to all observations in the layer.
    • Unique Values—Apply different symbols to qualitative categories defined by feature attribution.
    • Graduated Symbols—Apply symbols that vary in size to show quantitative differences.
    • Graduated Colors—Apply symbols that vary in color to show quantitative differences.

Symbolize track-aware stream layers

A track-aware stream layer relies on an attribute to group together observations that correspond to a single object. When a stream layer is track aware, you can symbolize the current (most recent) observations one way and the previous (older) observations another way. Track awareness is specified in the source stream service. You cannot make a stream layer track aware in ArcGIS Pro if its source stream service is not track aware.

You set the symbology for current and previous observations the same way you symbolize features in stream layers that are not track aware. The Symbology pane shows two tabs, Current and Previous, when you work with a track-aware stream layer. Set up symbology options independently on each tab. You can turn on and off the display of the previous observations without resetting the symbology properties.

You can import symbology from other layers—even other stream layers—but the symbology is applied only to the current observations.

Current observations

Follow these steps to symbolize current observations.

  1. Select a stream layer in the Contents pane.
  2. Under Stream Layer on the Appearance tab in the Drawing group, click Symbology Symbology.
  3. In the Symbology pane, under the Current tab, on the Primary Symbology tab Primary symbology, choose a symbology option from the Primary Symbology menu.

Previous observations

Follow these steps to symbolize previous observations.

  1. Select a stream layer in the Contents pane.
  2. Under Stream Layer on the Appearance tab in the Drawing group, click Symbology Symbology.
  3. In the Symbology pane, under the Previous tab, on the Primary Symbology tab Primary symbology, choose a symbology option from the Primary Symbology menu.
  4. Optionally click the Show previous observations toggle button to turn on or off the display of all previous observations without resetting the symbology properties.

Vary stream layer symbology by transparency, rotation, size, or color

Depending on the symbology used to draw the layer, you can symbolize stream layer observations by additional attributes to vary the transparency, rotation, size, and color. Not all of these options are available with each symbology choice.

Follow these steps to set up additional symbology.

  1. In the Symbology pane (under the Current or Previous tab if the stream layer is track aware), click the Vary symbology by attribute tab Vary symbology by attribute.
  2. Expand Transparency, Rotation, Color, or Size.
  3. Adjust as desired.

Label observations

Label stream layers to identify the observations by attribute or expression. When a stream layer is track aware, only the current observations are labeled.

Follow these steps to label stream layers.

  1. Select a stream layer in the Contents pane.
  2. Under Stream Layer on the Labeling tab in the Layer group, click Label Enable Labeling.
  3. Adjust other labeling properties on the Labeling tab as necessary.

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