PROBLEM
Sometimes ArcMap places more than one label for the same feature
There are several possible causes:
· When labeling lines or polygons, an option can be set for controlling whether features having the same field value should be labeled separately or not. For example, the state of Hawaii consists of seven islands, each one of them can be labeled separately as “Hawaii” or only one label can be placed for all of them.
· Connected line features not having the exact same value for the label field are labeled separately. For example, if one segment has a blank or misspelled field value, the adjacent features are treated as unique and each gets a label.
· Labeling features based on a joined field that has a one to many match causes one label to be placed for a feature for each matching record even though they have the same value.
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