The Maplex Label Engine Line connection options combine groups of individual line features with the same name into a single linear feature for the label engine. This is usually desirable because linear features, such as pipelines and utility networks, are often digitized as many small segments that must be connected to represent a single real-world feature. If the segments are not connected, the feature may appear to be overlabeled, with the same label repeated along its length for each segment. Line connection is applied when placing labels with the Regular placement and River placement styles.
The line connection type lets you control how junctions are handled when lines are connected. There are two options:
- Minimize labels—This option puts the emphasis on labeling the features so that a minimum number of labels are required. Rather than placing a label on either side of the junction for the same feature, it may place a single label on one side of the junction, or the label may span the junction. The first image below illustrates this setting.
- Unambiguous—Junctions in the network are labeled so there is no ambiguity about which feature is which. This tends to place more labels on the map than the Minimize labels option, because the same feature may be labeled on either side of the junction. This is the default. The second image below illustrates this setting.
When line connection is on, the Maplex Label Engine always connects line segments, so the number of output labels will not match the number of input label features.
You may want to turn off the line connection in some cases, such as the following:
- You need every line feature to be individually labeled.
- You want to view labels for all the segments to identify problems with your labels.
- You want to see each feature labeled to view the improvement in label placement with the line connection.
When line connection is turned off, you can specify how many labels will be placed per feature:
- One label per feature—A label is placed for every feature. Duplicate labels are not removed. If you have a multipart feature, this option places one label for the entire multipart line.
- One label per part—A label is placed for each part of a multipart feature. Duplicates are not removed.
- One label per segment—A label is placed for each segment of a line feature. Duplicates are not removed.
- Ensure the Maplex Label Engine is enabled.
- Ensure Labeling is the active way of displaying the Contents pane.
- Select a label class in the Contents pane and click the Labeling tab.
- On the Labeling tab, in the Label Placement group, click Label Placement Properties .
- On the Labeling pane, click Position and click .
- Expand Line connection.
- Specify how you want the features connected or if you want them to be unconnected for labeling.
Check the Connect features check box.
Choose the line label type: One label per feature, One label per part, or One label per segment.
Uncheck the Connect features check box.
Choose the line label type: Unambiguous or Minimize labels.