If a layer or feature class with a selection is used as the input, only vertices of the selected features will be snapped. In the Snap Environment parameter, multiple snap rules can be designated using the same layer or feature class with a different snapping type. The input features' vertices will be snapped to the nearest vertex, edge, or end point within the specified distance. When multiple snapping rules are provided, they are prioritized from top to bottom on the tool dialog box or from left to right in scripting. The Snap Environment parameter allows for the vertices of the input features to be snapped to the vertices, edges, and end points of multiple layers or feature classes. See Tools that modify or update the input data for more information and strategies to avoid undesired data changes.
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