Source code for satpy.tests.reader_tests.test_tropomi_l2

#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2019 Satpy developers
#
# This file is part of Satpy.
#
# 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.
#
# Satpy is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# Satpy.  If not, see <http://www.gnu.org/licenses/>.
"""Module for testing the satpy.readers.tropomi_l2 module."""

import os
import unittest
from datetime import datetime
from unittest import mock

import numpy as np
import xarray as xr

from satpy.tests.reader_tests.test_netcdf_utils import FakeNetCDF4FileHandler

DEFAULT_FILE_DTYPE = np.uint16
DEFAULT_FILE_SHAPE = (3246, 450)
DEFAULT_FILE_DATA = np.arange(DEFAULT_FILE_SHAPE[0] * DEFAULT_FILE_SHAPE[1],
                              dtype=DEFAULT_FILE_DTYPE).reshape(DEFAULT_FILE_SHAPE)
DEFAULT_BOUND_DATA = np.arange(DEFAULT_FILE_SHAPE[0] * DEFAULT_FILE_SHAPE[1] * 4,
                               dtype=DEFAULT_FILE_DTYPE).reshape(DEFAULT_FILE_SHAPE+(4,))


[docs]class FakeNetCDF4FileHandlerTL2(FakeNetCDF4FileHandler): """Swap-in NetCDF4 File Handler."""
[docs] def get_test_content(self, filename, filename_info, filetype_info): """Mimic reader input file content.""" dt_s = filename_info.get('start_time', datetime(2016, 1, 1, 12, 0, 0)) dt_e = filename_info.get('end_time', datetime(2016, 1, 1, 12, 0, 0)) if filetype_info['file_type'] == 'tropomi_l2': file_content = { '/attr/time_coverage_start': dt_s.strftime('%Y-%m-%dT%H:%M:%S.000Z'), '/attr/time_coverage_end': dt_e.strftime('%Y-%m-%dT%H:%M:%S.000Z'), '/attr/platform_shortname': 'S5P', '/attr/sensor': 'TROPOMI', } file_content['PRODUCT/latitude'] = DEFAULT_FILE_DATA file_content['PRODUCT/longitude'] = DEFAULT_FILE_DATA file_content['PRODUCT/SUPPORT_DATA/GEOLOCATIONS/latitude_bounds'] = DEFAULT_BOUND_DATA file_content['PRODUCT/SUPPORT_DATA/GEOLOCATIONS/longitude_bounds'] = DEFAULT_BOUND_DATA if 'NO2' in filename: file_content['PRODUCT/nitrogen_dioxide_total_column'] = DEFAULT_FILE_DATA if 'SO2' in filename: file_content['PRODUCT/sulfurdioxide_total_vertical_column'] = DEFAULT_FILE_DATA for k in list(file_content.keys()): if not k.startswith('PRODUCT'): continue file_content[k + '/shape'] = DEFAULT_FILE_SHAPE self._convert_data_content_to_dataarrays(file_content) file_content['PRODUCT/latitude'].attrs['_FillValue'] = -999.0 file_content['PRODUCT/longitude'].attrs['_FillValue'] = -999.0 file_content['PRODUCT/SUPPORT_DATA/GEOLOCATIONS/latitude_bounds'].attrs['_FillValue'] = -999.0 file_content['PRODUCT/SUPPORT_DATA/GEOLOCATIONS/longitude_bounds'].attrs['_FillValue'] = -999.0 if 'NO2' in filename: file_content['PRODUCT/nitrogen_dioxide_total_column'].attrs['_FillValue'] = -999.0 if 'SO2' in filename: file_content['PRODUCT/sulfurdioxide_total_vertical_column'].attrs['_FillValue'] = -999.0 else: raise NotImplementedError("Test data for file types other than " "'tropomi_l2' are not supported.") return file_content
def _convert_data_content_to_dataarrays(self, file_content): """Convert data content to xarray's dataarrays.""" from xarray import DataArray for key, val in file_content.items(): if isinstance(val, np.ndarray): if 1 < val.ndim <= 2: file_content[key] = DataArray(val, dims=('scanline', 'ground_pixel')) elif val.ndim > 2: file_content[key] = DataArray(val, dims=('scanline', 'ground_pixel', 'corner')) else: file_content[key] = DataArray(val)
[docs]class TestTROPOMIL2Reader(unittest.TestCase): """Test TROPOMI L2 Reader.""" yaml_file = "tropomi_l2.yaml"
[docs] def setUp(self): """Wrap NetCDF4 file handler with our own fake handler.""" from satpy._config import config_search_paths from satpy.readers.tropomi_l2 import TROPOMIL2FileHandler 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(TROPOMIL2FileHandler, '__bases__', (FakeNetCDF4FileHandlerTL2,)) self.fake_handler = self.p.start() self.p.is_local = True
[docs] def tearDown(self): """Stop wrapping the NetCDF4 file handler.""" self.p.stop()
[docs] def test_init(self): """Test basic initialization of this reader.""" from satpy.readers import load_reader r = load_reader(self.reader_configs) loadables = r.select_files_from_pathnames([ 'S5P_OFFL_L2__NO2____20180709T170334_20180709T184504_03821_01_010002_20180715T184729.nc', ]) self.assertEqual(len(loadables), 1) r.create_filehandlers(loadables) # make sure we have some files self.assertTrue(r.file_handlers)
[docs] def test_load_no2(self): """Load NO2 dataset.""" from satpy.readers import load_reader r = load_reader(self.reader_configs) with mock.patch('satpy.readers.tropomi_l2.netCDF4.Variable', xr.DataArray): loadables = r.select_files_from_pathnames([ 'S5P_OFFL_L2__NO2____20180709T170334_20180709T184504_03821_01_010002_20180715T184729.nc', ]) r.create_filehandlers(loadables) ds = r.load(['nitrogen_dioxide_total_column']) self.assertEqual(len(ds), 1) for d in ds.values(): self.assertEqual(d.attrs['platform_shortname'], 'S5P') self.assertEqual(d.attrs['sensor'], 'tropomi') self.assertIn('area', d.attrs) self.assertIsNotNone(d.attrs['area']) self.assertIn('y', d.dims) self.assertIn('x', d.dims)
[docs] def test_load_so2(self): """Load SO2 dataset.""" from satpy.readers import load_reader r = load_reader(self.reader_configs) with mock.patch('satpy.readers.tropomi_l2.netCDF4.Variable', xr.DataArray): loadables = r.select_files_from_pathnames([ 'S5P_OFFL_L2__SO2____20181224T055107_20181224T073237_06198_01_010105_20181230T150634.nc', ]) r.create_filehandlers(loadables) ds = r.load(['sulfurdioxide_total_vertical_column']) self.assertEqual(len(ds), 1) for d in ds.values(): self.assertEqual(d.attrs['platform_shortname'], 'S5P') self.assertIn('area', d.attrs) self.assertIsNotNone(d.attrs['area']) self.assertIn('y', d.dims) self.assertIn('x', d.dims)
[docs] def test_load_bounds(self): """Load bounds dataset.""" from satpy.readers import load_reader r = load_reader(self.reader_configs) with mock.patch('satpy.readers.tropomi_l2.netCDF4.Variable', xr.DataArray): loadables = r.select_files_from_pathnames([ 'S5P_OFFL_L2__NO2____20180709T170334_20180709T184504_03821_01_010002_20180715T184729.nc', ]) r.create_filehandlers(loadables) keys = ['latitude_bounds', 'longitude_bounds'] ds = r.load(keys) self.assertEqual(len(ds), 2) for key in keys: self.assertEqual(ds[key].attrs['platform_shortname'], 'S5P') self.assertIn('y', ds[key].dims) self.assertIn('x', ds[key].dims) self.assertIn('corner', ds[key].dims) # check assembled bounds left = np.vstack([ds[key][:, :, 0], ds[key][-1:, :, 3]]) right = np.vstack([ds[key][:, -1:, 1], ds[key][-1:, -1:, 2]]) dest = np.hstack([left, right]) dest = xr.DataArray(dest, dims=('y', 'x') ) dest.attrs = ds[key].attrs self.assertEqual(dest.attrs['platform_shortname'], 'S5P') self.assertIn('y', dest.dims) self.assertIn('x', dest.dims) self.assertEqual(DEFAULT_FILE_SHAPE[0] + 1, dest.shape[0]) self.assertEqual(DEFAULT_FILE_SHAPE[1] + 1, dest.shape[1]) self.assertIsNone(np.testing.assert_array_equal(dest[:-1, :-1], ds[key][:, :, 0])) self.assertIsNone(np.testing.assert_array_equal(dest[-1, :-1], ds[key][-1, :, 3])) self.assertIsNone(np.testing.assert_array_equal(dest[:, -1], np.append(ds[key][:, -1, 1], ds[key][-1:, -1:, 2])) )