TerraAmazon defines the output of the classification process by applying topological rules to the input polygons.
A rule defines the spatial operation that input polygons will be submitted to during the classification and the layer that will be used for such operation.
A rule requires three layers to work:
Edition layer (Input Layer): necessary to open the edition mode. It works as a draft for vectorial edition (for more, refer to Edition Layer).
Rule layer: identified by the rule.
Destination layer (Output Layer): receives output data from the set of rules executed by the classification process.
The classification process may execute many consecutive rules before storing the result in the destination layer.
Operations Available for the Rules
In TerraAmazon there are three spatial operations that can be selected to compose a rule:
Difference
Intersection
Union
The following data will be used as an example to present the result of each one of the three operations listed.
No Rules (Not possible for edition through Projects) ![]()
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Difference
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Intersection
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Clean (Considering the red polygon was in the Output Layer)
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Note: TerraAmazon stores in the output layer only the result of the spatial operations defined by the active rules of the current project. This means that the final polygon stored can be geometrically different than the input one, depending only on the active rules of the project.