Add Geometry

Applicability:

• Cadcorp SIS Map Modeller
• Cadcorp SIS Map Editor
• Cadcorp SIS Map Manager
• Cadcorp SIS ActiveX Modeller
• Cadcorp SIS ActiveX Manager

Ribbon Group:

Create-Edit

Conditions for use:

• Item Class: All item classes
• Number selected: 1
• Minimum item status: Editable

Associated commands:

• Convex Hull
• Decompose
• Fill
• Process
• Remove Geometry
• Unfill

Description:

 Add Geometry merges geometry from the snapped item into the selected item.

Select the first Polygon item, select Add Geometry and click on the second Polygon item.

You could use this command to convert overlapping Polygon items to a MultiPolygon, the overlap is converted into a hole.

To do this again select the first Polygon item, select Add Geometry and click on the second Polygon item.

SIS merges the geometry of the two items by carrying out an Exclusive-Or Boolean operation, similar to Symmetric Difference. The selected item takes on the combined geometry, and the overlapped area is deleted.

Example - Creating a MultiPolygon:

1. Select a Polygon item to add other Polygons to.
   
   
2. Select Add Geometry.
   
   
3. Click on a Polygon to add to the selected Polygon. The two Polygon items now become one MultiPolygon.
   
   
4. Until you end the command, you can keep on adding further Polygon items to the MultiPolygon.

This command can be used to add any type of geometry to any other type of geometry to create a Geometry Collection.

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