Return the name of the map in the good format

def _format_name_map(self, lon, lat):
        ''' Return the name of the map in the good format '''

        if self.ppd in [4, 16, 64, 128]:
            lolaname = '_'.join(['LDEM', str(self.ppd)])
        elif self.ppd in [512]:
            lolaname = '_'.join(
                ['LDEM', str(self.ppd), lat[0], lat[1], lon[0], lon[1]])
        return lolaname