Evaluating feature extents

The extent of a feature is also known as its envelope. It is defined as a minimum bounding rectangle with a width (x-value) and height (y-value). The Evaluate Extent check returns features with minimum bounding rectangles that are within specified parameters. For example, you can check for building area polygons that have a minimum bounding rectangle with a width (x-value) of less than 25 meters and height (y-value) of less than 25 meters.

The check can be run on an entire feature class, a subtype, or a set of features selected using a SQL query.

Once you have defined the criteria for the check, you can configure the notes and a severity rating. The notes allow you to provide a more specific description for the feature that has been written to the Reviewer table and are copied to the Notes field in the Reviewer table. The severity rating allows you to indicate how important the results from a check are in terms of your quality assurance/quality control processes. The lower the number, the greater the priority the check's results have.

步骤:

1. Start ArcMap.
   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. On the main menu, click Customize > Toolbars > Data Reviewer.
3. Click the Select Data Check drop-down arrow on the Data Reviewer toolbar, click the plus sign (+) next to Spatial Parameter Evaluation Checks, then click Evaluate Extent Check.

   The Evaluate Extent Check Properties dialog box appears.
4. If necessary, type a unique name for the check in the Check Title text box.
   注意:

   The check title can be used to describe the conditions you are looking for with the check. This is useful when you have multiple instances of the same check to validate the same feature classes or tables but with different validation parameters.

5. Click the Feature Class/Subtype drop-down arrow to choose the feature class and subtype on which to run the check.
6. To run the check on the entire feature class and save this setting, check the Always Run on Full Database check box.
7. To run the check on specific features in a feature class, click SQL to construct a SQL query.
8. Click the Units drop-down arrow and choose the unit of measurement being used for the extent.
9. Click the Operation drop-down arrow in the X area and choose an operation to use for the extent's width.
   • Less than—The polygon feature's x-value is less than the number of units specified.
   • Less than or equal—The polygon feature's x-value is equal to or less than the number of units specified.
   • Greater than—The polygon feature's x-value is greater than the number of units specified.
   • Greater than or equal—The polygon feature's x-value is equal to or greater than the number of units specified.
   • Not equal to—The polygon feature's x-value is not equal to the number of units specified.
   • Equal to—The polygon feature's x-value is equal to the number of units specified.
   • In Between (Including Bounds)—The polygon feature's x-value is between or equal to the number of units specified in the Lower Bound (minimum) and Upper Bound (maximum) text boxes.
   • In Between (Not Including Bounds)—The polygon feature's x-value is between the number of units specified in the Lower Bound (minimum) and Upper Bound (maximum) text boxes.
   • Not In Between (Including Bounds)—The polygon feature's x-value is equal to or not between the number of units specified in the Lower Bound (minimum) and Upper Bound (maximum) text boxes.
   • Not In Between (Not Including Bounds)—The polygon feature's x-value is not between the number of units specified in the Lower Bound (minimum) and Upper Bound (maximum) text boxes.

   The operation text box appears. If you choose an operation with bounding values, Lower Bound and Upper Bound text boxes appear.

10. Type a value in the operation text box that represents the extent tolerance.

    If you choose an operation with bounding values, you must indicate two values: one each for the minimum and maximum ranges of the tolerance.

11. Click the Operation drop-down arrow in the Y area and choose an operation to use for the extent's height.
    • Less than—The polygon feature's y-value is less than the number of units specified.
    • Less than or equal—The polygon feature's y-value is equal to or less than the number of units specified.
    • Greater than—The polygon feature's y-value is greater than the number of units specified.
    • Greater than or equal—The polygon feature's y-value is equal to or greater than the number of units specified.
    • Not equal to—The polygon feature's y-value is not equal to the number of units specified.
    • Equal to—The polygon feature's y-value is equal to the number of units specified.
    • In Between (Including Bounds)—The polygon feature's y-value is between or equal to the number of units specified in the Lower Bound (minimum) and Upper Bound (maximum) text boxes.
    • In Between (Not Including Bounds)—The polygon feature's y-value is between the number of units specified in the Lower Bound (minimum) and Upper Bound (maximum) text boxes.
    • Not In Between (Including Bounds)—The polygon feature's y-value is equal to or not between the number of units specified in the Lower Bound (minimum) and Upper Bound (maximum) text boxes.
    • Not In Between (Not Including Bounds)—The polygon feature's y-value is not between the number of units specified in the Lower Bound (minimum) and Upper Bound (maximum) text boxes.

    The operation text box appears. If you choose an operation with bounding values, Lower Bound and Upper Bound text boxes appear.

12. Type a value that represents the extent tolerance in the operation text box.

If you choose an operation with bounding values, you must indicate two values: one each for the minimum and maximum ranges of the tolerance.

13. If necessary, type descriptive text for the check results in the Notes text box in the Reviewer Remarks area.
14. If necessary, click the Severity drop-down arrow and choose a value that indicates the priority of the check's results in the Reviewer Remarks area.
15. Click OK.
16. Click the Run Data Check button on the Data Reviewer toolbar.

    The Features to Validate dialog box appears.
17. Choose an option in the Features to Validate area.
    • Selection Set—The check is run on the features that are currently selected in the map.
    • Current Extent—The check is run on the current map extent, which is controlled by the map scale.
    • Definition Query—The check is run on the features that are displayed based on definition queries that have been created for the feature class.
    • Full Database—The check is run on all the features in the feature class.
18. To run the check only on features that have been edited in a versioned workspace, check the Changed Features Only check box.
    注意:

    The Changed Features Only option is available only for a versioned database.

19. Click OK.