GenerateElevationGrid
=====================

.. currentmodule:: globalmapper
.. py:function:: GenerateElevationGrid ([GM_LayerHandle_t32] aLayerList, GM_GridGenSetup_t aGridSetup) -> GM_Error_t32, GM_LayerHandle_t32, GM_LayerHandle_t32

    Generates an elevation grid and optionally a 3D area TIN layer from loaded 3D vector data. The returned grid layer
    handle(s) and TIN layer (if created) must be closed with :doc:`CloseLayer<../load/globalmapper.CloseLayer>` when you
    are done with them.

    :param [GM_LayerHandle_t32] aLayerList: List of layers to use or None for all
    :param GM_GridGenSetup_t aGridSetup: Grid setup parameters (pass None for default options)
    :returns: Error Code
    :rtype: GM_Error_t32
    :return: Created grid layer
    :rtype: GM_LayerHandle_t32
    :return: Created TIN area layer (optional, set to None if you don't want it)
    :rtype: GM_LayerHandle_t32
		
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.. list-table::
    :width: 100%
    :class: borderless
    :header-rows: 1

    * - BEFORE
      - AFTER

    * - .. image:: ../images/BeforeAfter_Images/PortlandGroundLidar.png
            :width: 374px
            :height: 290px
            :align: center

      - .. image:: ../images/BeforeAfter_Images/PortlandElevGrid.png
            :width: 374px
            :height: 290px
            :align: center

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Example
-------
The following is an example of GenerateElevationGrid.::

    gm.GenerateElevationGrid(lidar_layers, grid_setup)

For more context refer to :doc:`the surface analysis sample scripts<../sampleCode/DemoSurfaceAnalysis>`.