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The Dissolve Wizard dialog is used to simplify a group of features. Dissolving is a process by which multiple features are combined into a single feature if they have matching values in the column(s) you specify.
This dialog consists of 4 steps:
Step 1 of the Dissolve Wizard allows users to select which layer to dissolve. The Layer select box displays all layers available in the current project. After selecting a layer, the user can then press the Next button.
If your layer has certain features that have been selected on the Select Features tab, you may also check the Only dissolve the currently selected features on this layer checkbox.
Step 2 of the Dissolve Wizard allows users to select which Columns to Match. Only the features that have matching values in all of the columns that you specify will be dissolved together. You may select one or more columns in this step. There is also a View Data button in this step that allows you to view the layer's tabular data and determine the best column(s) to match.
In addition to the columns you selected in step 2, Step 3 allows you to add additional columns to be included in your final output layer. The additional columns are a combination of a column from the original data and an Operator which will select how you want the data added or aggregated.
Operator - This select box determines how the value for the output feature is calculated. Below is a description of the operator options:
There is also another View Data button that allows you to view the layer's tabular data to determine which data to include.
Like other Tools wizards, this step allows users to choose how they want the wizard results to be saved. Users can choose to Add to Map and specify the desired layer name, or choose to Output to File. If Output to File is chosen, the user must select an existing or new file to save the results into.
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