def Open_landsat(src_FileName, proyDEM_fileName):
    """
    This function opens a landsat image and returns the data array of a specific landsat band.
    """
    import SEBAL.pySEBAL.pySEBAL_code as SEBAL
    ls, ulx, uly, lrx, lry, epsg_to = SEBAL.reproject_dataset_example(
        src_FileName, proyDEM_fileName)
    ls_data = ls.GetRasterBand(1).ReadAsArray()
    return ls_data
