You’ll now dissolve the polygons of intersect_output to remove unnecessary boundaries between polygons. In the final tool you’ll select polygons based on the climate zone they belong to. Zones 1 and 2 both have a CLIMATE_ID of 2 as they are both close to the coast, and zone 3 has a CLIMATE_ID of 3, representing areas farther inland. You’ll dissolve all polygons with the same CLIMATE_ID.

To do so, expand the Generalization toolset located inside the Data Management Tools toolbox. Click and drag the Dissolve tool into the ModelBuilder window. Right-click the Dissolve tool and click Open.

Click the Input Features dropdown arrow and click the variable Intersect Output. Leave the default location for the Output Feature Class parameter and type “dissolve_output” for the name.

Check CLIMATE_ID in the Dissolve_Field(s) list to use CLIMATE_ID as the dissolve field.

The Dissolve tool gives you the option to create a statistics field, but you don’t need to create one at this time, so leave the Statistics Field(s) parameter blank.

Click Auto Layout, then Full Extent to display all the model elements in their default position in the display window. Right-click the dissolve_output derived data element and click Rename. Type “Dissolve Output” and click OK.

Right-click the Dissolve Output derived data element and click Add To Display. Right-click the Dissolve tool and click Run.

Right-click this layer in the table of contents of ArcMap and click Open Attribute Table. There are now only two rows in the table. The polygons have been dissolved into two groups, those with a CLIMATE_ID of 2—climate zones 1 and 2—and those with a CLIMATE_ID of 3, which includes climate zone 3. Close the table. Click the Model menu and click Save.