Split Polygons

Note: Split Polygon 3D is only available in the OpenCities Map Ultimate edition of this product.

Use the Split Polygons feature to split a closed element in two. If the split element had properties, then the new elements will have those same properties. Any annotation for the initial element will be deleted. New annotation can be added for each new element by using the edit tool, making any changes to the properties and placing the new annotation.

Valid closed elements are: Shape, Complex Shape, Ellipse, Group Hole, 2D Polygon Collection, 3D Polygon Collection.

Valid cut line elements are: Line, Linestring, Complex Line.

The following tool settings are available in a 2D model:

Setting	Description
Polygons Selection	If an existing selection set of closed elements is not found, then this setting describes how the elements are selected. By User - Prompts you to select a closed element. Multiple elements can be selected with a datapoint. When all elements are selected, enter a datapoint in the view followed by a reset. This is the default setting. By Cut Line - Splits selected elements at the location of a cut line. The cut line can be drawn interactively when Draw Cut Line is on, or be an existing linear element that passes through the selected elements.
Draw Cut Line	When on, draw a cut line that defines the split location for the selected element. When off, select an existing cut line that defines the split location for the selected elements.

Setting

Description

Polygons Selection

If an existing selection set of closed elements is not found, then this setting describes how the elements are selected.

By User - Prompts you to select a closed element. Multiple elements can be selected with a datapoint. When all elements are selected, enter a datapoint in the view followed by a reset. This is the default setting.
By Cut Line - Splits selected elements at the location of a cut line. The cut line can be drawn interactively when Draw Cut Line is on, or be an existing linear element that passes through the selected elements.

Draw Cut Line

When on, draw a cut line that defines the split location for the selected element. When off, select an existing cut line that defines the split location for the selected elements.

The Split Polygon tool supports 3D non-planar closed polygons. The following tool settings are available in a 3D model:

Settings	Description
Target Elements	Specifies which elements to split. Surfaces - Valid features are polygons and any polygon collection. Invalid elements are CityGML features. Polygon Collections - All faces inside the cut area will be added to the first collection. All faces outside the cut area will be in the second collection. Polygons - All polygons touched by the cut area perimeter are split into two or more polygons. All polygons completely inside or outside the cut area are unchanged. Volumes - Valid features are watertight polygon collections. Invalid features are polygon collections that are not watertight or that are not polygons. The resulting collections will be watertight. If needed, extra faces will be created and added to the collection. All polygon sections in the cut area will be in the first collection. All polygon sections outside the cut area will be in the second collection.
Direction	Specifies the direction of the split. Closed views are shown in gray.
Polygons Selection	If an existing selection set of closed elements is not found, then this setting describes how the elements are selected. By User - Prompts you to select a closed element. Multiple elements can be selected with a datapoint. When all elements are selected, enter a datapoint in the view followed by a reset. By Cut Area - Splits target elements based on the location of a cut area. The cut area can be drawn interactively when Draw Cut Area is on, or be an existing closed element that passes through the target elements.
Draw Cut Area	When on, draw a cut area that defines the split location for the target elements. When off, select an existing closed that defines the split location for the target elements.

Note: If a split rule is defined in the feature definition, then that rule will be applied when setting the new polygons properties. See the OpenCities Geospatial Administrator section of this help for details.

To split polygon collections when:

Polygon Selection is set to By Cut Area

The Split Polygon tool allows you to split one or more polygon collections that lie partially within a cut area. The cut area can be defined by an existing shape or by datapoints. The general steps are defined as follows:

If Draw Cut Area is off, identify an existing shape. Accept with a datapoint.
If Draw Cut Area is on, enter data points to define the cut area. Reset to complete the shape.
All polygon collections that intersect with the cut area are split.

To split polygon collections when:

Polygons Selection is set to By User

The Split Polygon tool allows you to split one or more polygon collections. The identification of polygon collections is determined by entering a datapoint within the boundaries of one shape belonging to the collection. The general steps are defined as follows:

Select a shape that belongs to the first polygon collection.
Accept the selection with a datapoint, and optionally select a shape belonging to another polygon selection.
Continue to accept and select the shapes until all polygon collections have been identified.
Accept the last selection with a datapoint.
Press Reset to complete the selection process. The selected polygon collections will be highlighted.
Split Polygon will then prompt to place or select the cut area.
If Draw Cut Area is enabled, enter data points to define the cut area. If Draw Cut Area is not enabled, select an existing closed element that defines the cut area.
Press Reset to complete.
The selected polygons are split.

Key-ins:

SPLITMERGE SPLIT

SPLITMERGE SPLITTOOLSETTINGS