globalmapper.GetPixelBandValue
==============================

.. currentmodule:: globalmapper
.. py:function:: GetPixelBandValue (GM_LayerHandle_t32 aLayer, sint32 aRow, sint32 aCol, sint32 aBand) -> GM_Error_t32, sint32

    Retrieves the band value at a given pixel location in the provided layer.  If the layer does not contain a valid
    sample at the provided pixel location (i.e. it is a "no data" or transparent value), GM_Error_NoDataAtLocation will
    be returned. Use this to access the raw values from high-bit depth and multi-band imagery layers.

    :param GM_LayerHandle_t32 aLayer: Layer to get color from
    :param sint32 aRow: Y coord of pixel (0 is topmost)
    :param sint32 aCol: X coord of pixel (0 is leftmost)
    :param sint32 aBand: Band to get value for (0-based, so first band is 1)
    :returns: Error Code
    :rtype: GM_Error_t32
    :return: Color of pixel at location
    :rtype: sint32