globalmapper.CreateCustomVectorLayer
====================================

.. currentmodule:: globalmapper
.. py:function:: CreateCustomVectorLayer (str aDescription, GM_Projection_t aProj) -> GM_LayerHandle_t32

    Creates a new custom layer for adding vector features to. The handle to the newly created layer is returned. You
    must call :doc:`CloseLayer<../load/globalmapper.CloseLayer>` on the returned handle when you are done with it. If a
    problem occurs, 0 is returned for the layer handle. After creating the layer, use the
    :doc:`AddAreaToVectorLayer<globalmapper.AddAreaToVectorLayer>`,
    :doc:`AddLineToVectorLayer<globalmapper.AddLineToVectorLayer>`, and
    :doc:`AddPointToVectorLayer<globalmapper.AddPointToVectorLayer>` functions to add features to the layer.

    :param str aDescription: Description to use for layer (can be None to use default)
    :param GM_Projection_t aProj: Native projection of new layer
    :returns: The new custom vector layer
    :rtype: GM_LayerHandle_t32