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# -*- coding: utf-8 -*- |
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# vim:fileencoding=utf-8 |
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# |
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# Copyright (c) 2014-2017 Stefan Bender |
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# |
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# This file is part of sciapy. |
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# sciapy is free software: you can redistribute it or modify it |
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# under the terms of the GNU General Public License as published by |
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# the Free Software Foundation, version 2. |
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# See accompanying LICENSE file or http://www.gnu.org/licenses/gpl-2.0.html. |
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"""SCIAMACHY level 1c limb spectra binary interface |
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""" |
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from __future__ import absolute_import, division, print_function |
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import numpy as np |
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from ._types import _float_type, _int_type, _limb_data_dtype |
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def _write_padded_string(fp, s, padding): |
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s = s.encode('ascii', "ignore") |
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count = padding - len(s) |
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fp.write(s) |
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# pad |
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fp.write(b'\x00' * count) |
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def _read_single_float(fp): |
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ret = np.frombuffer(fp.read(4), dtype=_float_type)[0] |
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return ret |
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def _write_int_to_binary(fp, a): |
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fp.write(np.asarray(a, dtype=_int_type).tostring()) |
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def _write_float_to_binary(fp, a): |
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fp.write(np.asarray(a, dtype=_float_type).tostring()) |
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def read_from_mpl_binary(self, filename): |
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"""SCIAMACHY level 1c limb scan binary import |
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Parameters |
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---------- |
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filename : str |
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The binary filename to read the data from. |
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Returns |
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------- |
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nothing |
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""" |
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if hasattr(filename, 'seek'): |
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f = filename |
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else: |
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f = open(filename, 'rb') |
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hlen = 100 |
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# the first bytes of the first 100 header bytes are |
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# the number of header lines that follow |
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nline = "" |
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j = 0 |
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flag = 0 |
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while j < hlen: |
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char = bytes(f.read(1)) |
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if char == b'\n': |
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# we have a usual text file, abort binary reading. |
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raise ValueError |
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j += 1 |
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if char and char != b'\x00' and flag == 0: |
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nline += char.decode() |
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else: |
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flag = 1 |
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self.textheader_length = int(''.join(nline)) |
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h_list = [] |
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for _ in range(self.textheader_length): |
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line = "" |
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j = 0 |
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flag = 0 |
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while j < hlen: |
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char = bytes(f.read(1)) |
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j += 1 |
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if char and char != b'\x00' and flag == 0: |
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line += char.decode() |
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else: |
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flag = 1 |
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h_list.append(line.rstrip()) |
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self.textheader = '\n'.join(h_list) |
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self.parse_textheader() |
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# global data |
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self.nalt = np.frombuffer(f.read(4), dtype=_int_type)[0] |
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self.npix = np.frombuffer(f.read(4), dtype=_int_type)[0] |
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self.orbit_state = np.frombuffer(f.read(4 * 5), dtype=_int_type) |
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(self.orbit, self.state_in_orbit, self.state_id, |
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self.profiles_per_state, self.profile_in_state) = self.orbit_state |
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self.date = np.frombuffer(f.read(4 * 6), dtype=_int_type) |
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self.cent_lat_lon = np.frombuffer(f.read(4 * 10), dtype=_float_type) |
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if self.textheader_length > 29: |
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self.orbit_phase = np.frombuffer(f.read(4), dtype=_float_type)[0] |
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self.wls = np.frombuffer(f.read(4 * self.npix), dtype=_float_type) |
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if self._limb_data_dtype is None: |
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self._limb_data_dtype = _limb_data_dtype[:] |
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if self.textheader_length < 28: |
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self._limb_data_dtype.remove(("sub_sat_lat", _float_type)) |
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self._limb_data_dtype.remove(("sub_sat_lon", _float_type)) |
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self._limb_data_dtype.append(("rad", _float_type, (self.npix))) |
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self._limb_data_dtype.append(("err", _float_type, (self.npix))) |
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self.limb_data = np.fromfile(f, dtype=np.dtype(self._limb_data_dtype), |
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count=self.nalt).view(type=np.recarray) |
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def write_to_mpl_binary(self, filename): |
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"""SCIAMACHY level 1c limb scan binary export |
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Parameters |
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---------- |
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filename : str |
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The binary filename to write the data to. |
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Returns |
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------- |
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nothing |
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""" |
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if hasattr(filename, 'seek'): |
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f = filename |
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else: |
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f = open(filename, 'wb') |
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# write out the padded header first |
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bufsize = 100 |
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_write_padded_string(f, str(self.textheader_length), bufsize) |
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h_list = self.textheader.split('\n') |
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for h_line in h_list: |
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_write_padded_string(f, h_line, bufsize) |
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_write_int_to_binary(f, self.nalt) |
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_write_int_to_binary(f, self.npix) |
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_write_int_to_binary(f, self.orbit_state) |
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_write_int_to_binary(f, self.date) |
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_write_float_to_binary(f, self.cent_lat_lon) |
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if self.textheader_length > 29: |
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_write_float_to_binary(f, self.orbit_phase) |
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_write_float_to_binary(f, self.wls) |
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# write the data as is, the dtype should take care of |
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# all the formatting. |
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self.limb_data.tofile(f) |
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f.close() |
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st-bender /
sciapy
