Option

Description

Apply rules in the following order

The conflict resolution rules to apply when combining coverages. This list is populated with all rules that have been created in the current session or imported.

The rules are applied in the order that they are listed. The order can be changed by selecting a rule and dragging it to a new location in the list.

Rule description

The details of the rule currently selected in the list of rules to apply.

New

Launch the Rule Wizard and create a new conflict resolution rule. See Rule Wizard for information on creating and editing rules.

Modify

Launch the Rule Wizard and edit the rule currently selected in the list of rules to apply.

1. Select a rule in the list.

2. Click Modify.

3. Edit the settings of the rule.

4. Click OK to save the changes and return to the Combine Coverages wizard.

Delete

Remove the currently selected rule from the list of rules to apply. If the rule has not been exported to a file, the rule will be permanently deleted. If it has been saved to a file, this will simply remove the rule from the list; the rule file will not be affected.

Import

Import an existing rule that has been previously exported to a rule file.

Export

Export a new or edited rule to a new rule file for future use. This will create a .crfx file with the details of the rule.

Override ambiguity check

Select this option if conflict resolution is not required. When this option is selected, the application will first use any conflict rules to try to resolve conflicts. If the conflict cannot be resolved, the application will then automatically select the first node that meets all the criteria in the rules. Whichever coverage contains this node will be considered the superseding coverage.

Apply dataset metadata rules based on

This option can be used to consider holes as valid data in the combine process when applying metadata rules. This option requires the selection of at least one metadata rule. When this option is applied, the winning surface of a metadata rule will be determined based on the metadata only, regardless of whether the surface has populated data or holes in the area. Any holes within the winning areas will be preserved in the output surface.

This option can be applied based on the source surfaces’ bounding polygon or holiday band.

• When using the Bounding polygon option:

• The entire area inside the bounding polygon of the winning surface will contribute to the output surface, whether it is populated with data or not. See Digitize New Bounding Polygon for information on creating or editing bounding polygons.

• If conflicts cannot be resolved using a single rule, multiple rules can be applied, but they must be metadata rules - band level rules cannot be applied when using this option.

• When using the Holiday band option:

• The entire area covered by the holiday band of the winning surface will contribute to the output surface, whether it is populated with data or holes.

• Areas outside the data are not considered; only internal holes identified by a holiday band may be preserved.

• A holiday band must already exist for each surface being combined. A holiday band classifies each pixel of a surface as no data, data or a hole. This classification defines which areas are holes in a surface, which areas contain data and which areas are outside of the surface area. See Identify Holidays for information on creating a holiday band.

• If conflicts cannot be resolved using only metadata rules, band-level rules can also be applied. Hole-preservation cannot be guaranteed in this case. Alternatively, the override ambiguity option can be enabled.

If combining only point clouds and rules have been specified, the Bounding polygon option needs to be selected. The Holiday band option is not applicable in this situation.

1. Click the check box to enable the options.

2. Select an option.