def geo_origin(raster_geo):
    """Return upper-left corner of geo-transform

    Returns the upper-left corner cordinates of :class:`GDAL.Geotransform`
    with the coordinates returned in the same projection/GCS as the input
    geotransform.

    Args:
        raster_geo (:class:`GDAL.Geotransform`): Input GDAL Geotransform

    Returns:
        tuple:
        raster_origin: (x, y) coordinates of the upper left corner

    """
    return (raster_geo[0], raster_geo[3])