The Dissolve Boundaries tool merges areas that overlap or share a common boundary into a single area.
A city council wants to control liquor sales by refusing new licenses to stores within 1,000 feet of schools, libraries, and parks. After creating a 1,000-foot buffer around the schools, libraries, and parks, the buffered layers can be joined together and the boundaries can be dissolved to create a single layer of restricted areas.
See the Proximity to schools case study for the complete workflow.
The input must be a single layer of area features.
There are two methods for dissolving boundaries: overlapping or adjacent areas, and field value.
Areas that overlap or are adjacent
Two or more areas whose boundaries overlap or who share a common boundary will be merged into one area.
Areas with the same field value
Areas that overlap or share a common boundary will be merged into one area if they have the same field value. More than one field can be selected to merge the areas.
The Dissolve Boundaries tool has the option to calculate statistics on numerical fields for areas that are being dissolved together. The statistics include sum, average, minimum, maximum, and standard deviation. Each time a Field and Statistic is entered, a new row will be added to the tool pane so more than one statistic can be calculated at once.
If Use current map extent is checked, only the features in input layer visible within the current map extent will be dissolved. If unchecked, all features in the input layer will be dissolved, even if they are outside the current map extent.
Click Show Credits before you run your analysis to check how many credits will be consumed.
The Dissolve Boundaries tool can be used on area features only.
Use Dissolve Boundaries when you want to aggregate overlapping or adjacent areas into a single area. Other tools may be useful in solving similar but slightly different problems.
Map Viewer analysis tools
ArcGIS Desktop analysis tools
Dissolve Boundaries performs a similar function to Dissolve.