Evaluating z-values (Maritime Charting)

The z-value usually indicates the elevation of a feature above the ground surface. If features from a particular feature class should be populated with relatively similar values for elevation, the Evaluate Z Values check can be run to ensure that the elevations for features in a specified feature class are within an expected range of values.

Note:

A vertical coordinate system must be defined for the feature class you want to use with this check.

The Evaluate Z Values check returns features with z-values that fall within specified parameters. The check can be run on an entire feature class, a subtype, or a set of features selected using a SQL query. Those features with z-values that fall within the specified range are returned.

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.

Steps:

1. Start ArcMap.
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 Z Value Checks, then click Evaluate Z Values Check.

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

   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 an SQL query.
8. Click the drop-down arrow in the Elevation area and choose the units of measurement to use with the z-values.
9. Click the Operation drop-down arrow and choose an operation to determine the threshold for z-values.
   • Less than—The z-value is less than the number of units specified. For example, if the value is 10, features with a z-value of 9 through 0 are returned as results.
   • Less than or equal—The z-value is equal to or less than the number of units specified. For example, if the value is 10, features with a z-value of 10 through 0 are returned as results.
   • Greater than—The z-value is greater than the number of units specified. For example, if the value is 10, features with a z-value of 11 or more are returned as results.
   • Greater than or equal—The z-value is equal to or greater than the number of units specified. For example, if the value is 12, features with a z-value of 12 or more are returned as results.
   • Not equal to—The z-value is not equal to the number of units specified. For example, if the value is 10, features with a z-value of 8, 12, or any other value that is not equal to 10 are returned as results.
   • Equal to—The z-value is equal to the number of units specified. For example, if the value is 10, features with a z-value of 10 are returned as results.
   • In Between - Including Bounds—The z-value is between or equal to the number of units specified in the Lower Bound (minimum) and Upper Bound (maximum) text boxes. For example, if the lower bound is 1 and the upper bound is 10, features with a z-value of 1 through 10 are returned as results.
   • In Between - Not Including Bounds—The z-value is between the number of units specified in the Lower Bound (minimum) and Upper Bound (maximum) text boxes. For example, if the lower bound is 1 and the upper bound is 10, features with a z-value of 2 through 9 are returned as results.
   • Not (In Between - Including Bounds)—The z-value is not equal to or between the number of units specified in the Lower Bound (minimum) and Upper Bound (maximum) text boxes. For example, if the lower bound is 1 and the upper bound is 10, features with a z-value of 0 or less or 11 or greater are returned as results.
   • Not (In Between - Not Including Bounds)—The z-value is equal to or not between the number of units specified in the Lower Bound (minimum) and Upper Bound (maximum). For example, if the lower bound is 1 and the upper bound is 10, features with a z-value of 1 or less or 10 or greater are returned as results.

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

10. Type the number of units to use with the operation.

    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. If necessary, type descriptive text for the check results in the Notes text box in the Reviewer Remarks area.
12. 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.

    The severity indicates the importance of the check result. The values range from 1 to 5, with 1 being the highest priority and 5 being the lowest.

13. Click OK.
14. Click the Run Data Check button on the Data Reviewer toolbar.

    The Features to Validate dialog box appears.
15. 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.
16. To run the check only on features that have been edited in a versioned workspace, check the Changed Features Only check box.
    Note:

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

17. Click OK.

    The check is run on the extent specified on the Features to Validate dialog box.

    When the check finishes, a check results dialog box appears.

18. Do one of the following:
    • If you want to browse the results in the Browse Features window, choose the Browse Results option.
    • If you have started a Reviewer session and want to record the results in the Reviewer table, choose the Write to Reviewer Table option.
19. Click OK.