Simplifying bad geometry

Importing data from other sources may introduce geometry that ArcGIS does not support, such as polygons with only two vertices. The Simplify command simplifies the geometries of selected features to ensure that the geometry is valid.

The geometries are simplified based on the conditions they meet. The table below summarizes the different conditions for invalid geometry and the method used to simplify each.

Geometry condition

Simplification method

Null geometry

The feature is deleted from the feature class.

Short segment

The short segment is deleted.

Incorrect ring ordering

The geometry is updated to have correct ring ordering.

Incorrect segment orientation

The geometry is updated to have correct segment orientation.

Self-intersections

The segments that intersect are split at their intersection.

Unclosed rings

The unclosed rings are closed.

Empty parts

That parts that are null or empty are deleted.

Simplification methods for bad geometry
步骤:
  1. Start ArcMap.
    提示提示:

    If the ArcMap - Getting Started dialog box appears, you can open a new or existing map document. You can also check the Do not show this dialog box in the future check box and click Open.

  2. If necessary, load data in the map.
  3. On the main menu, click Customize > Toolbars > Production Editing.
  4. On the main menu, click Customize > Toolbars > Production Editing Advanced.
  5. Click the Production Start Editing button Production Start Editing on the Production Editing toolbar.
    注意注意:

    The Manage Features and Create Attributes, Update Attributes, or Metadata Attributes windows automatically appear when you start an edit session using the Production Start Editing tool.

    提示提示:

    If the Create Attributes, Update Attributes, or Metadata Attributes window does not appear when you start an edit session, click the Link Feature Manager To Attributes Window button Show/Hide Attributes on the Manage Features window.

  6. On the Production Editing Advanced toolbar, click More Edit Tools > Select Bad Geometry.
  7. Drag a box around the features to be selected.

    The Select Bad Geometry Complete message box appears, indicating the number of instances of bad geometry found in the current selection.

  8. Click OK.

    The features with bad geometry are selected.

  9. On the Production Editing Advanced toolbar, click More Edit Tools > Simplify.

    The features with bad geometry are simplified, and the Production Simplify message appears.

  10. Click OK.

9/23/2010