The snapping tolerance is the distance within which the pointer or a feature is snapped to another location. If the element being snapped to—such as a vertex or edge—is within the distance you set, the pointer automatically snaps to the location.
You set the snap tolerance value in pixels (the default option) or map units when working with classic snapping. When editing, press the T key to see a circle representing the snap tolerance, shown in green on the graphic below.
You can also interactively set the snap tolerance when working in classic snapping by using the Snap Tolerance tool, which you can add to the ArcMap user interface from the Customize dialog box. To set the snap tolerance with the Snap Tolerance tool, click the map and drag the pointer to draw a circle.
- Click the Editor menu, point to Snapping, then click Options.
- Click the Snapping tolerance drop-down arrow and click the type of measurement unit you want to use for snapping tolerance—pixels or map units. This only updates the snapping tolerance for the classic snapping environment used with editing tools.
When the snapping tolerance is set to map units, you can also give the value in other units by specifying a distance units abbreviation with the value that you enter. For example, to specify a distance of 10 feet, type in 10ft. Distance unit abbreviations only work if your data frame is projected.
- Type the desired number of measurement units.
- Click OK.