Source code for satpy.tests.reader_tests.test_msu_gsa_l1b

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (c) 2019 Satpy developers
#
# This file is part of satpy.
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# satpy is free software: you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
#
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# A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License along with
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"""Tests for the 'msu_gsa_l1b' reader."""
import os
from unittest import mock

import dask.array as da
import numpy as np
import pytest
import xarray as xr

from satpy.tests.reader_tests.test_hdf5_utils import FakeHDF5FileHandler
from satpy.tests.utils import make_dataid

SOLCONST = '273.59'


[docs] class FakeHDF5FileHandler2(FakeHDF5FileHandler): """Swap-in HDF5 File Handler."""
[docs] def _get_data(self, num_scans, num_cols): data = { 'Data/resolution_1km/Solar_Zenith_Angle': xr.DataArray( da.ones((num_scans*4, num_cols*4), chunks=1024, dtype=np.uint16), attrs={ 'scale': 0.01, 'offset': 0., 'fill_value': -999. }, dims=('x', 'y')), 'Geolocation/resolution_1km/Latitude': xr.DataArray( da.ones((num_scans*4, num_cols*4), chunks=1024, dtype=np.uint16), attrs={ 'scale': 0.01, 'offset': 0., 'fill_value': -999. }, dims=('x', 'y')), 'Geolocation/resolution_1km/Longitude': xr.DataArray( da.ones((num_scans*4, num_cols*4), chunks=1024, dtype=np.uint16), attrs={ 'scale': 0.01, 'offset': 0., 'fill_value': -999. }, dims=('x', 'y')), 'Data/resolution_1km/Radiance_01': xr.DataArray( da.ones((num_scans*4, num_cols*4), chunks=1024, dtype=np.uint16), attrs={ 'scale': 0.01, 'offset': 0., 'fill_value': -999., 'F_solar_constant': SOLCONST }, dims=('x', 'y')), 'Data/resolution_4km/Solar_Zenith_Angle': xr.DataArray( da.ones((num_scans, num_cols), chunks=1024, dtype=np.uint16), attrs={ 'scale': 0.01, 'offset': 0., 'fill_value': -999. }, dims=('x', 'y')), 'Geolocation/resolution_4km/Latitude': xr.DataArray( da.ones((num_scans, num_cols), chunks=1024, dtype=np.uint16), attrs={ 'scale': 0.01, 'offset': 0., 'fill_value': -999. }, dims=('x', 'y')), 'Geolocation/resolution_4km/Longitude': xr.DataArray( da.ones((num_scans, num_cols), chunks=1024, dtype=np.uint16), attrs={ 'scale': 0.01, 'offset': 0., 'fill_value': -999. }, dims=('x', 'y')), 'Data/resolution_4km/Brightness_Temperature_09': xr.DataArray( da.ones((num_scans, num_cols), chunks=1024, dtype=np.uint16), attrs={ 'scale': 0.01, 'offset': 0., 'fill_value': -999. }, dims=('x', 'y')), } return data
[docs] def get_test_content(self, filename, filename_info, filetype_info): """Mimic reader input file content.""" num_scans = 20 num_cols = 2048 global_attrs = { '/attr/timestamp_without_timezone': '2022-01-13T12:45:00', '/attr/satellite_observation_point_height': '38500.0', '/attr/satellite_observation_point_latitude': '71.25', '/attr/satellite_observation_point_longitude': '21.44', } data = self._get_data(num_scans, num_cols) test_content = {} test_content.update(global_attrs) test_content.update(data) return test_content
[docs] class TestMSUGSABReader: """Test MSU GS/A L1B Reader.""" yaml_file = "msu_gsa_l1b.yaml"
[docs] def setup_method(self): """Wrap HDF5 file handler with our own fake handler.""" from satpy._config import config_search_paths from satpy.readers import load_reader from satpy.readers.msu_gsa_l1b import MSUGSAFileHandler self.reader_configs = config_search_paths(os.path.join('readers', self.yaml_file)) # http://stackoverflow.com/questions/12219967/how-to-mock-a-base-class-with-python-mock-library self.p = mock.patch.object(MSUGSAFileHandler, '__bases__', (FakeHDF5FileHandler2,)) self.fake_handler = self.p.start() self.p.is_local = True filenames = ['ArcticaM1_202201131245.h5'] self.reader = load_reader(self.reader_configs) files = self.reader.select_files_from_pathnames(filenames) self.reader.create_filehandlers(files)
[docs] def teardown_method(self): """Stop wrapping the HDF5 file handler.""" self.p.stop()
[docs] def test_irbt(self): """Test retrieval in brightness temperature.""" ds_ids = [make_dataid(name='C09', calibration='brightness_temperature')] res = self.reader.load(ds_ids) assert 'C09' in res assert res['C09'].attrs['calibration'] == 'brightness_temperature' assert res['C09'].attrs['platform_name'] == 'Arctica-M-N1' assert res['C09'].attrs['sat_latitude'] == 71.25 assert res['C09'].attrs['sat_longitude'] == 21.44 assert res['C09'].attrs['sat_altitude'] == 38500. assert res['C09'].attrs['resolution'] == 4000
[docs] def test_nocounts(self): """Test we can't get IR or VIS data as counts.""" ds_ids = [make_dataid(name='C01', calibration='counts')] with pytest.raises(KeyError): self.reader.load(ds_ids) ds_ids = [make_dataid(name='C09', calibration='counts')] with pytest.raises(KeyError): self.reader.load(ds_ids)
[docs] def test_vis_cal(self): """Test that we can retrieve VIS data as both radiance and reflectance.""" ds_ids = [make_dataid(name='C01', calibration='radiance')] res = self.reader.load(ds_ids) rad = res['C01'].data ds_ids = [make_dataid(name='C01', calibration='reflectance')] res = self.reader.load(ds_ids) refl = res['C01'].data # Check the RAD->REFL conversion np.testing.assert_allclose(100 * np.pi * rad / float(SOLCONST), refl)