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Best Editing Practices to Reduce Topological Errors

• Snap • Autocomplete • Clip/Split/Merge

On course webpages Video Resources

In the Edit tab,

Set snapping on

Set features to participate in snap

Set snapping tolerance, either interactively, or through settings

Don’t Digitize the Same Edge Twice!

Use Auto Complete Polygon in the Create Features Panel

Use, merge, clip, split in the modify features panel while digitizing

With the Edit tab active,

Modify features panel selected,

Use Transparency While Digitizing!

- Right click on layer in TOC, - Then on Properties - In Color Editor, find

transparency slider - Set transparent level

You can see edges better with transparent layers

Don’t Digitize the Same Edge Twice!

Or digitize a “containing” polygon and use select/clip/discard in the Editor toolbar (see videos for details)

Then Use Topological Tools to Clean Up

• Validate topology (extent, or specified area) • View error table, select error to identify, then fix with

edit tools