CombineTerrainLayers
====================

.. currentmodule:: globalmapper

.. py:function:: CombineTerrainLayers(GM_GridCombineSetup_t aSetup, uint32 aReserved=0) -> GM_Error_t32, GM_LayerHandle_t32

    Combines two loaded terrain layers using some operation (i.e. addition, subtraction, etc.) and creates a new terrain
    layer from the combined return. The returned new layer must be closed with
    :doc:`CloseLayer<../load/globalmapper.CloseLayer>` when you are done working with it.

    :param GM_GridCombineSetup_t aSetup: Setup for operation
    :param uint32 aReserved: Reserved for future use; defaults to 0
    :returns: Error Code
    :rtype: GM_Error_t32
    :return: Layer handle for newly created combined layer
    :rtype: GM_LayerHandle_t32