def _load(self, scale=0.001):
        """Load the Landsat OLI relative spectral responses
        """

        with open_workbook(self.path) as wb_:
            for sheet in wb_.sheets():
                if sheet.name in ['Plot of AllBands', ]:
                    continue
                ch_name = OLI_BAND_NAMES.get(sheet.name.strip())

                if ch_name != self.bandname:
                    continue

                wvl = sheet.col_values(0, 2)
                resp = sheet.col_values(1, 2)

                self.rsr = {'wavelength': np.array(wvl) / 1000.,
                            'response': np.array(resp)}
                break
Load the Landsat OLI relative spectral responses