globalmapper.SpatialOperation
=============================

.. currentmodule:: globalmapper
.. py:function:: SpatialOperation (GM_SpatialOperations_t8 aOperation, GM_LayerHandle_t32 aLayer1, GM_LayerHandle_t32 aLayer2, GM_SpatialOps_Params_t aParams) -> GM_Error_t32

	General spatial operation. Any of the two-layer spatial operation functions available in Global Mapper can be
	performed through this function, by entering the desired operation in the *aOperation* parameter.

	Currently, the available operations and their parameter values are:

	-   :doc:`SpatialIntersection <globalmapper.SpatialIntersection>` - *GM_SpatialOps_Intersection*
	-   :doc:`SpatialUnion <globalmapper.SpatialUnion>` - *GM_SpatialOps_Union*
	-   :doc:`SpatialDifference <globalmapper.SpatialDifference>` - *GM_SpatialOps_Difference*
	-   :doc:`SpatialSymmetricDifference <globalmapper.SpatialSymmetricDifference>` - *GM_SpatialOps_SymmetricDifference*
	
	:param GM_SpatialOperations_t8 aOperation: Operation to use
	:param GM_LayerHandle_t32 aLayer1: First layer in operation
	:param GM_LayerHandle_t32 aLayer2: Second layer in operation; may be gm.NULL
	:param GM_SpatialOps_Params_t aParams: Parameters
	:returns: Error Code
	:rtype: GM_Error_t32