#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (c) 2018 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/>.
"""The scmi_abi_l1b reader tests package."""
import unittest
from unittest import mock
import numpy as np
import pytest
import xarray as xr
[docs]
class FakeDataset(object):
"""Fake dataset."""
def __init__(self, info, attrs, dims=None):
"""Init the dataset."""
for var_name, var_data in list(info.items()):
if isinstance(var_data, np.ndarray):
info[var_name] = xr.DataArray(var_data)
self.info = info
self.attrs = attrs
self.dims = dims or {}
def __getitem__(self, key):
"""Get item."""
return self.info.get(key, self.dims.get(key))
def __contains__(self, key):
"""Check contains."""
return key in self.info or key in self.dims
[docs]
def rename(self, *args, **kwargs):
"""Rename the dataset."""
return self
[docs]
def close(self):
"""Close the dataset."""
return
[docs]
class TestSCMIFileHandler(unittest.TestCase):
"""Test the SCMIFileHandler reader."""
[docs]
@mock.patch("satpy.readers.scmi.xr")
def setUp(self, xr_):
"""Set up for test."""
from satpy.readers.scmi import SCMIFileHandler
rad_data = (np.arange(10.).reshape((2, 5)) + 1.)
rad_data = (rad_data + 1.) / 0.5
rad_data = rad_data.astype(np.int16)
self.expected_rad = rad_data.astype(np.float64) * 0.5 + -1.
self.expected_rad[-1, -2] = np.nan
time = xr.DataArray(0.)
rad = xr.DataArray(
rad_data,
dims=("y", "x"),
attrs={
"scale_factor": 0.5,
"add_offset": -1.,
"_FillValue": 20,
"standard_name": "toa_bidirectional_reflectance",
},
coords={
"time": time,
}
)
xr_.open_dataset.return_value = FakeDataset(
{
"Sectorized_CMI": rad,
"nominal_satellite_subpoint_lat": np.array(0.0),
"nominal_satellite_subpoint_lon": np.array(-89.5),
"nominal_satellite_height": np.array(35786.02),
},
{
"start_date_time": "2017210120000",
"satellite_id": "GOES-16",
"satellite_longitude": -90.,
"satellite_latitude": 0.,
"satellite_altitude": 35785831.,
},
{"y": 2, "x": 5},
)
self.reader = SCMIFileHandler("filename",
{"platform_shortname": "G16"},
{"filetype": "info"})
[docs]
def test_basic_attributes(self):
"""Test getting basic file attributes."""
from datetime import datetime
from satpy.tests.utils import make_dataid
assert self.reader.start_time == datetime(2017, 7, 29, 12, 0, 0, 0)
assert self.reader.end_time == datetime(2017, 7, 29, 12, 0, 0, 0)
assert self.reader.get_shape(make_dataid(name="C05"), {}) == (2, 5)
[docs]
def test_data_load(self):
"""Test data loading."""
from satpy.tests.utils import make_dataid
res = self.reader.get_dataset(
make_dataid(name="C05", calibration="reflectance"), {})
np.testing.assert_allclose(res.data, self.expected_rad, equal_nan=True)
assert "scale_factor" not in res.attrs
assert "_FillValue" not in res.attrs
assert res.attrs["standard_name"] == "toa_bidirectional_reflectance"
assert "orbital_parameters" in res.attrs
orb_params = res.attrs["orbital_parameters"]
assert orb_params["projection_longitude"] == -90.0
assert orb_params["projection_latitude"] == 0.0
assert orb_params["projection_altitude"] == 35785831.0
[docs]
class TestSCMIFileHandlerArea(unittest.TestCase):
"""Test the SCMIFileHandler's area creation."""
[docs]
@mock.patch("satpy.readers.scmi.xr")
def create_reader(self, proj_name, proj_attrs, xr_):
"""Create a fake reader."""
from satpy.readers.scmi import SCMIFileHandler
proj = xr.DataArray([], attrs=proj_attrs)
x__ = xr.DataArray(
[0, 1],
attrs={"scale_factor": 2., "add_offset": -1., "units": "meters"},
)
y__ = xr.DataArray(
[0, 1],
attrs={"scale_factor": -2., "add_offset": 1., "units": "meters"},
)
xr_.open_dataset.return_value = FakeDataset({
"goes_imager_projection": proj,
"x": x__,
"y": y__,
"Sectorized_CMI": np.ones((2, 2))},
{
"satellite_id": "GOES-16",
"grid_mapping": proj_name,
},
{
"y": y__.size,
"x": x__.size,
}
)
return SCMIFileHandler("filename",
{"platform_shortname": "G16"},
{"filetype": "info"})
[docs]
@mock.patch("satpy.readers.abi_base.geometry.AreaDefinition")
def test_get_area_def_geos(self, adef):
"""Test the area generation for geos projection."""
reader = self.create_reader(
"goes_imager_projection",
{
"semi_major_axis": 1.,
"semi_minor_axis": 1.,
"perspective_point_height": 1.,
"longitude_of_projection_origin": -90.,
"sweep_angle_axis": u"x",
"grid_mapping_name": "geostationary",
}
)
reader.get_area_def(None)
assert adef.call_count == 1
call_args = tuple(adef.call_args)[0]
assert call_args[3] == {"a": 1.0, "b": 1.0, "h": 1.0,
"lon_0": -90.0, "lat_0": 0.0,
"proj": "geos", "sweep": "x", "units": "m"}
assert call_args[4] == reader.ncols
assert call_args[5] == reader.nlines
np.testing.assert_allclose(call_args[6], (-2., -2., 2, 2.))
[docs]
@mock.patch("satpy.readers.abi_base.geometry.AreaDefinition")
def test_get_area_def_lcc(self, adef):
"""Test the area generation for lcc projection."""
reader = self.create_reader(
"goes_imager_projection",
{
"semi_major_axis": 1.,
"semi_minor_axis": 1.,
"longitude_of_central_meridian": -90.,
"standard_parallel": 25.,
"latitude_of_projection_origin": 25.,
"grid_mapping_name": "lambert_conformal_conic",
}
)
reader.get_area_def(None)
assert adef.call_count == 1
call_args = tuple(adef.call_args)[0]
assert call_args[3] == {"a": 1.0, "b": 1.0,
"lon_0": -90.0, "lat_0": 25.0, "lat_1": 25.0,
"proj": "lcc", "units": "m"}
assert call_args[4] == reader.ncols
assert call_args[5] == reader.nlines
np.testing.assert_allclose(call_args[6], (-2., -2., 2, 2.))
[docs]
@mock.patch("satpy.readers.abi_base.geometry.AreaDefinition")
def test_get_area_def_stere(self, adef):
"""Test the area generation for stere projection."""
reader = self.create_reader(
"goes_imager_projection",
{
"semi_major_axis": 1.,
"semi_minor_axis": 1.,
"straight_vertical_longitude_from_pole": -90.,
"standard_parallel": 60.,
"latitude_of_projection_origin": 90.,
"grid_mapping_name": "polar_stereographic",
}
)
reader.get_area_def(None)
assert adef.call_count == 1
call_args = tuple(adef.call_args)[0]
assert call_args[3] == {"a": 1.0, "b": 1.0,
"lon_0": -90.0, "lat_0": 90.0, "lat_ts": 60.0,
"proj": "stere", "units": "m"}
assert call_args[4] == reader.ncols
assert call_args[5] == reader.nlines
np.testing.assert_allclose(call_args[6], (-2., -2., 2, 2.))
[docs]
@mock.patch("satpy.readers.abi_base.geometry.AreaDefinition")
def test_get_area_def_merc(self, adef):
"""Test the area generation for merc projection."""
reader = self.create_reader(
"goes_imager_projection",
{
"semi_major_axis": 1.,
"semi_minor_axis": 1.,
"longitude_of_projection_origin": -90.,
"standard_parallel": 0.,
"grid_mapping_name": "mercator",
}
)
reader.get_area_def(None)
assert adef.call_count == 1
call_args = tuple(adef.call_args)[0]
assert call_args[3] == {"a": 1.0, "b": 1.0,
"lon_0": -90.0, "lat_0": 0.0, "lat_ts": 0.0,
"proj": "merc", "units": "m"}
assert call_args[4] == reader.ncols
assert call_args[5] == reader.nlines
np.testing.assert_allclose(call_args[6], (-2., -2., 2, 2.))
[docs]
@mock.patch("satpy.readers.abi_base.geometry.AreaDefinition")
def test_get_area_def_bad(self, adef):
"""Test the area generation for bad projection."""
reader = self.create_reader(
"goes_imager_projection",
{
"semi_major_axis": 1.,
"semi_minor_axis": 1.,
"longitude_of_projection_origin": -90.,
"standard_parallel": 0.,
"grid_mapping_name": "fake",
}
)
with pytest.raises(ValueError, match="Can't handle projection 'fake'"):
reader.get_area_def(None)