globalmapper.SpatialUnionSingle
===============================

.. currentmodule:: globalmapper
.. py:function:: SpatialUnionSingle (GM_LayerHandle_t32 aLayer1, GM_SpatialOps_Params_t aParams) -> GM_Error_t32

	A **Single Union** operation works on one layer set as Layer 1 in the dialog. This operation examines the overlap
	between features in the layer, and creates features in the result layer for overlapping and non-overlapping regions.
	For each region that is formed by overlapping features, identical features are created for each feature (and
	containing its attributes) that participated in the overlap.
	
	:param GM_LayerHandle_t32 aLayer: Layer in operation
	:param GM_SpatialOps_Params_t aParams: Parameters
	:returns: Error Code
	:rtype: GM_Error_t32