Geometric Operations

It is accessed through:

    Processing > Vector Processing > Geometric Operation...

1. Select one layer in the List of Layers
• Click Next.
2. Choose the attributes that will compose the output layer (skip this step if all attributes are desirable) 
• Select the attributes in the Available Properties list. 
• Move the selected attributes to Used Properties list.
• Click Next.
3. Choose the operation(s)/methdology and output layer name/repository:
• Operations: 
• Convex Hull / Centroid / Minimum Bounding Rectangle (MBR) - Each operation will generate a geometry attribute in a distinct output layer suffixed by the operation name.
• Area / Line / Perimeter - These operations will generate numeric attributes in all output layers generated.
• Methodology: 
• All Objects - Selects all layer objects to perform the operation.
• Aggregated Objects - it  aggregates all objects (generating only one) to perform the operation.
• By Attributes - it aggregates the objects with the same attribute in groups and  perform the operation over the groups.
• Output: Inform the Output Repository
• Clicking on  to select the output directory and inform the new layer name, or
• Clicking on  to select the Data Source repository and after
•  Inform the new Layer Name to store the operation result.
• Click Finish to perform the operation, Back to change some parameters or Cancel to close the interface.

Usage tips:

The Geometric Operation result can be stored in different TerraLib data sources. Check data source selector for more details on how to select a data source.