def test_is_loaded(self):
"""Check load status of a channel.
"""
data = np.random.rand(3, 3)
self.chan = Channel(name="newchan")
self.assert_(not self.chan.is_loaded())
self.chan = Channel(name="newchan", data=data)
self.assert_(self.chan.is_loaded())
def test_is_loaded(self):
"""Check load status of a channel.
"""
data = np.random.rand(3, 3)
self.chan = Channel(name="newchan")
self.assert_(not self.chan.is_loaded())
self.chan = Channel(name="newchan", data=data)
self.assert_(self.chan.is_loaded())
def test_as_image(self):
"""Check the geo_image version of the channel.
"""
data = np.random.rand(3, 3)
self.chan = Channel(name="newchan", data=data)
img = self.chan.as_image(False)
self.assert_(np.allclose(img.channels[0], data))
self.assertEqual(img.mode, "L")
img = self.chan.as_image(True)
self.assertEqual(img.channels[0].max(), 1)
self.assertEqual(img.channels[0].min(), 0)
def test_check_range(self):
"""Check the range of a channel.
"""
self.chan = Channel(name="newchan")
self.assertRaises(ValueError, self.chan.check_range)
numb = np.random.uniform(10)
self.assertRaises(ValueError, self.chan.check_range, numb)
# ndarray
data = np.random.rand(3, 3)
self.chan = Channel(name="newchan", data=data)
min_range = (data.max() - data.min()) / 2
self.assert_(np.all(data == self.chan.check_range(min_range)))
zeros = np.zeros_like(data)
min_range = (data.max() - data.min()) + E
self.assert_(np.all(zeros == self.chan.check_range(min_range)))
# masked array
mask = np.array(np.random.rand(3, 3) * 2, dtype=int)
mask[1, 1] = False
data = np.ma.array(data, mask=mask)
self.chan = Channel(name="newchan", data=data)
min_range = (data.max() - data.min()) / 2
self.assert_(np.all(data == self.chan.check_range(min_range)))
self.assertEquals(data.count(), self.chan.check_range(min_range).count())
zeros = np.zeros_like(data)
min_range = (data.max() - data.min()) + E
self.assert_(np.all(zeros == self.chan.check_range(min_range)))
data = np.ma.array(data, mask=True)
self.chan = Channel(name="newchan", data=data)
self.assertEquals(0, self.chan.check_range(min_range).count())
self.assertEquals(data.count(), self.chan.check_range(min_range).count())
# Wrong type arguments
self.assertRaises(TypeError, self.chan.check_range, random_string(4))
self.assertRaises(TypeError, self.chan.check_range, [np.random.uniform()])
def test_str(self):
"""String output for a channel.
"""
self.chan = Channel(name="newchan",
wavelength_range=(1., 2., 3.),
resolution=1000)
self.assertEqual(
str(self.chan),
"'newchan: (1.000,2.000,3.000)μm, resolution 1000m,"
" not loaded'")
self.chan.data = np.random.rand(3, 3)
self.assertEqual(
str(self.chan), "'newchan: (1.000,2.000,3.000)μm, "
"shape (3, 3), "
"resolution 1000m'")
def test_str(self):
"""String output for a channel.
"""
self.chan = Channel(name="newchan", wavelength_range=(1.0, 2.0, 3.0), resolution=1000)
self.assertEqual(str(self.chan), "'newchan: (1.000,2.000,3.000)μm, resolution 1000m," " not loaded'")
self.chan.data = np.random.rand(3, 3)
self.assertEqual(str(self.chan), "'newchan: (1.000,2.000,3.000)μm, " "shape (3, 3), " "resolution 1000m'")
def test_as_image(self):
"""Check the geo_image version of the channel.
"""
data = np.random.rand(3, 3)
self.chan = Channel(name="newchan", data=data)
img = self.chan.as_image(False)
self.assert_(np.allclose(img.channels[0], data))
self.assertEqual(img.mode, "L")
img = self.chan.as_image(True)
self.assertEqual(img.channels[0].max(), 1)
self.assertEqual(img.channels[0].min(), 0)
def test_check_range(self):
"""Check the range of a channel.
"""
self.chan = Channel(name="newchan")
self.assertRaises(ValueError, self.chan.check_range)
numb = np.random.uniform(10)
self.assertRaises(ValueError, self.chan.check_range, numb)
# ndarray
data = np.random.rand(3, 3)
self.chan = Channel(name="newchan", data=data)
min_range = (data.max() - data.min()) / 2
self.assert_(np.all(data == self.chan.check_range(min_range)))
zeros = np.zeros_like(data)
min_range = (data.max() - data.min()) + E
self.assert_(np.all(zeros == self.chan.check_range(min_range)))
# masked array
mask = np.array(np.random.rand(3, 3) * 2, dtype=int)
mask[1, 1] = False
data = np.ma.array(data, mask=mask)
self.chan = Channel(name="newchan", data=data)
min_range = (data.max() - data.min()) / 2
self.assert_(np.all(data == self.chan.check_range(min_range)))
self.assertEquals(data.count(),
self.chan.check_range(min_range).count())
zeros = np.zeros_like(data)
min_range = (data.max() - data.min()) + E
self.assert_(np.all(zeros == self.chan.check_range(min_range)))
data = np.ma.array(data, mask=True)
self.chan = Channel(name="newchan", data=data)
self.assertEquals(0, self.chan.check_range(min_range).count())
self.assertEquals(data.count(),
self.chan.check_range(min_range).count())
# Wrong type arguments
self.assertRaises(TypeError, self.chan.check_range, random_string(4))
self.assertRaises(TypeError, self.chan.check_range,
[np.random.uniform()])
def test_cmp(self):
"""Comparison of channels.
"""
self.chan = Channel(name="newchan")
self.chan2 = Channel(name="mychan")
self.assertTrue(self.chan > self.chan2)
self.chan = Channel(name="newchan")
self.chan2 = "mychan"
self.assertTrue(self.chan > self.chan2)
self.chan = Channel(name="newchan")
self.chan2 = Channel(name="newchan")
self.assert_(self.chan == self.chan2)
self.chan = Channel(wavelength_range=(1.0, 2.0, 3.0))
self.chan2 = Channel(name="newchan")
self.assert_(self.chan < self.chan2)
self.chan = Channel(name="newchan")
self.chan2 = Channel(name="_mychan")
self.assert_(self.chan < self.chan2)
self.chan = Channel(name="_newchan")
self.chan2 = Channel(name="mychan")
self.assert_(self.chan > self.chan2)
self.chan = Channel(name=random_string(4), wavelength_range=(1.0, 2.0, 3.0))
self.chan2 = Channel(name=random_string(4), wavelength_range=(4.0, 5.0, 6.0))
self.assert_(self.chan < self.chan2)
self.chan = Channel(name="_" + random_string(4), wavelength_range=(1.0, 2.0, 3.0))
self.chan2 = Channel(name=random_string(4), wavelength_range=(4.0, 5.0, 6.0))
self.assert_(self.chan > self.chan2)
def test_init(self):
"""Creation of a channel.
"""
self.assertRaises(ValueError, Channel)
# Name
self.chan = Channel(name="newchan")
self.assertEqual(self.chan.name, "newchan")
self.assertEqual(self.chan.wavelength_range, [-np.inf, -np.inf, -np.inf])
self.assertEqual(self.chan.resolution, 0)
self.assert_(self.chan.data is None)
numb = int(np.random.uniform(100000))
self.assertRaises(TypeError, Channel, name=numb)
numb = np.random.uniform() * 100000
self.assertRaises(TypeError, Channel, name=numb)
# Resolution
numb = int(np.random.uniform(100000))
self.assertRaises(ValueError, Channel, resolution=numb)
numb = int(np.random.uniform(100000))
self.chan = Channel(name="newchan", resolution=numb)
self.assertEqual(self.chan.name, "newchan")
self.assertEqual(self.chan.wavelength_range, [-np.inf, -np.inf, -np.inf])
self.assertEqual(self.chan.resolution, numb)
self.assert_(self.chan.data is None)
self.assertRaises(TypeError, Channel, name="newchan", resolution="a")
# Wavelength
numbs = [np.random.uniform(100), np.random.uniform(100), np.random.uniform(100)]
numbs.sort()
self.chan = Channel(wavelength_range=numbs)
self.assertEqual(self.chan.name, None)
self.assertEqual(self.chan.wavelength_range, numbs)
self.assertEqual(self.chan.resolution, 0)
self.assert_(self.chan.data is None)
self.assertRaises(TypeError, Channel, wavelength_range=numbs[0:1])
numbs.sort(reverse=True)
self.assertRaises(ValueError, Channel, wavelength_range=numbs)
numbs = [int(np.random.uniform(100)), int(np.random.uniform(100)), int(np.random.uniform(100))]
numbs.sort()
self.assertRaises(TypeError, Channel, wavelength_range=numbs)
self.assertRaises(TypeError, Channel, wavelength_range=random_string(4))
numb = np.random.uniform(100000)
self.assertRaises(TypeError, Channel, wavelength_range=numb)
numb = int(np.random.uniform(100000))
self.assertRaises(TypeError, Channel, wavelength_range=numb)
# Data
data = np.random.rand(3, 3)
self.assertRaises(ValueError, Channel, data=data)
self.chan = Channel(name="newchan", data=data)
self.assertEqual(self.chan.name, "newchan")
self.assertEqual(self.chan.wavelength_range, [-np.inf, -np.inf, -np.inf])
self.assertEqual(self.chan.resolution, 0)
self.assert_(np.all(self.chan.data == data))
mask = np.array(np.random.rand(3, 3) * 2, dtype=int)
data = np.ma.array(data, mask=mask)
self.chan = Channel(name="newchan", data=data)
self.assertEqual(self.chan.name, "newchan")
self.assertEqual(self.chan.wavelength_range, [-np.inf, -np.inf, -np.inf])
self.assertEqual(self.chan.resolution, 0)
self.assert_(np.all(self.chan.data == data))
self.assertRaises(TypeError, Channel, name="newchan", data=random_string(4))
numb = np.random.uniform(100000)
self.assertRaises(TypeError, Channel, name="newchan", data=numb)
numb = int(np.random.uniform(100000))
self.assertRaises(TypeError, Channel, name="newchan", data=numb)
numbs = [np.random.uniform(100), np.random.uniform(100), np.random.uniform(100)]
self.assertRaises(TypeError, Channel, name="newchan", data=numbs)
def _load02(filename):
"""Load data from a netcdf4 file, cf-satellite v0.2 (2012-02-03).
"""
rootgrp = Dataset(filename, 'r')
# processed variables
processed = set()
# Currently satpy does not like unicode (so much).
satellite_name, satellite_number = [str(i) for i in rootgrp.platform.rsplit("-", 1)]
time_slot = rootgrp.variables["time"].getValue()[0]
time_slot = num2date(time_slot, TIME_UNITS)
processed |= set(["time"])
try:
service = str(rootgrp.service)
except AttributeError:
service = ""
instrument_name = str(rootgrp.instrument)
try:
orbit = str(rootgrp.orbit)
except AttributeError:
orbit = None
try:
scene = GenericFactory.create_scene(satellite_name,
satellite_number,
instrument_name,
time_slot,
orbit,
None,
service)
except NoSectionError:
scene = VisirCompositer(time_slot=time_slot)
scene.satname = satellite_name
scene.number = satellite_number
scene.service = service
dim_chart = {}
for var_name, var in rootgrp.variables.items():
varname = None
try:
varname = var.standard_name
except AttributeError:
try:
varname = var.long_name
except AttributeError:
pass
if varname in ["band_data", "Band data"]:
LOG.debug("Found some data: " + var_name)
dims = var.dimensions
for dim in dims:
dim_chart[dim] = var_name
for cnt, dim in enumerate(dims):
if dim.startswith("band"):
break
data = var
data.set_auto_maskandscale(False)
area = None
try:
area_var_name = getattr(var,"grid_mapping")
area_var = rootgrp.variables[area_var_name]
proj4_dict = {}
for attr, projattr in MAPPING_ATTRIBUTES.items():
try:
the_attr = getattr(area_var, attr)
if projattr == "proj":
proj4_dict[projattr] = PROJNAME[the_attr]
elif(isinstance(projattr, (list, tuple))):
try:
for i, subattr in enumerate(the_attr):
proj4_dict[projattr[i]] = subattr
except TypeError:
proj4_dict[projattr[0]] = the_attr
else:
proj4_dict[projattr] = the_attr
except AttributeError:
pass
y_name, x_name = dims[:cnt] + dims[cnt + 1:]
x__ = rootgrp.variables[x_name][:]
y__ = rootgrp.variables[y_name][:]
if proj4_dict["proj"] == "geos":
x__ *= proj4_dict["h"]
y__ *= proj4_dict["h"]
x_pixel_size = abs((np.diff(x__)).mean())
y_pixel_size = abs((np.diff(y__)).mean())
llx = x__[0] - x_pixel_size / 2.0
lly = y__[-1] - y_pixel_size / 2.0
urx = x__[-1] + x_pixel_size / 2.0
ury = y__[0] + y_pixel_size / 2.0
area_extent = (llx, lly, urx, ury)
try:
# create the pyresample areadef
from pyresample.geometry import AreaDefinition
area = AreaDefinition("myareaid", "myareaname",
"myprojid", proj4_dict,
len(x__), len(y__),
area_extent)
except ImportError:
LOG.warning("Pyresample not found, "
"cannot load area descrition")
processed |= set([area_var_name, x_name, y_name])
LOG.debug("Grid mapping found and used.")
except AttributeError:
LOG.debug("No grid mapping found.")
try:
area_var = getattr(var,"coordinates")
coordinates_vars = area_var.split(" ")
lons = None
lats = None
for coord_var_name in coordinates_vars:
coord_var = rootgrp.variables[coord_var_name]
units = getattr(coord_var, "units")
if(coord_var_name.lower().startswith("lon") or
units.lower().endswith("east") or
units.lower().endswith("west")):
lons = coord_var[:]
elif(coord_var_name.lower().startswith("lat") or
units.lower().endswith("north") or
units.lower().endswith("south")):
lats = coord_var[:]
if lons.any() and lats.any():
try:
from pyresample.geometry import SwathDefinition
area = SwathDefinition(lons=lons, lats=lats)
except ImportError:
LOG.warning("Pyresample not found, "
"cannot load area descrition")
processed |= set(coordinates_vars)
LOG.debug("Lon/lat found and used.")
except AttributeError:
LOG.debug("No lon/lat found.")
names = rootgrp.variables[dim][:]
scales = data.scale_factor
offsets = data.add_offset
if len(names) == 1:
scales = np.array([scales])
offsets = np.array([offsets])
LOG.info("Scales and offsets: %s %s %s" % (str(names), str(scales), str(offsets)))
for nbr, name in enumerate(names):
name = str(name)
try:
if cnt == 0:
chn_data = data[nbr, :, :].squeeze()
if cnt == 1:
chn_data = data[:, nbr, :].squeeze()
if cnt == 2:
chn_data = data[:, :, nbr].squeeze()
scene[name] = (np.ma.masked_equal(chn_data, data._FillValue)
* scales[nbr] + offsets[nbr])
scene[name].info["units"] = var.units
except KeyError:
from satpy.channel import Channel
scene.channels.append(Channel(name))
if area is not None:
scene[name].area = area
processed |= set([var_name, dim])
non_processed = set(rootgrp.variables.keys()) - processed
for var_name in non_processed:
var = rootgrp.variables[var_name]
if not (hasattr(var, "standard_name") or
hasattr(var, "long_name")):
LOG.info("Delayed processing of " + var_name)
continue
dims = var.dimensions
if len(dims) != 1:
LOG.info("Don't know what to do with " + var_name)
continue
dim = dims[0]
if var.standard_name == "radiation_wavelength":
names = rootgrp.variables[dim][:]
for nbr, name in enumerate(names):
name = str(name)
scene[name].wavelength_range[1] = var[nbr]
try:
bnds = rootgrp.variables[var.bounds][:]
for nbr, name in enumerate(names):
name = str(name)
scene[name].wavelength_range[0] = bnds[nbr, 0]
scene[name].wavelength_range[2] = bnds[nbr, 1]
processed |= set([var.bounds])
except AttributeError:
pass
processed |= set([var_name])
non_processed = set(rootgrp.variables.keys()) - processed
if len(non_processed) > 0:
LOG.warning("Remaining non-processed variables: " + str(non_processed))
return scene
def test_sunzen_corr(self):
'''Test Sun zenith angle correction.
'''
import datetime as dt
chan = Channel(name='test')
original_value = 10.
chan.data = original_value * np.ones((2, 11))
lats = np.zeros((2, 11)) # equator
lons = np.array([np.linspace(-90, 90, 11), np.linspace(-90, 90, 11)])
# Equinox, so the Sun is at the equator
time_slot = dt.datetime(2014, 3, 20, 16, 57)
new_ch = chan.sunzen_corr(time_slot, lonlats=(lons, lats), limit=80.)
# Test minimum after correction, accuracy of three decimals is enough
#self.assertTrue(np.abs(10.000 - np.min(new_ch.data)) < 10**-3)
self.assertAlmostEqual(10.000, np.min(new_ch.data), places=3)
# Test maximum after correction
self.assertAlmostEqual(57.588, np.max(new_ch.data), places=3)
# There should be ten values at zenith angle >= 80 deg, and
# these are all equal
self.assertTrue(np.where(new_ch.data == \
np.max(new_ch.data))[0].shape[0] == 10)
# All values should be larger than the starting values
self.assertTrue(np.all(new_ch.data > original_value))
# Channel name
self.assertEqual(new_ch.name, chan.name + '_SZC')
# Test channel name in the info dict
self.assertEqual(new_ch.name, chan.info['sun_zen_corrected'])
# Test with several locations and arbitrary data
chan = Channel(name='test2')
chan.data = np.array(
[[0., 67.31614275, 49.96271995, 99.41046645, 29.08660989],
[87.61007584, 79.6683524, 53.20397351, 29.88260374, 62.33623915],
[60.49283004, 54.04267222, 32.72365906, 91.44995651, 32.27232955],
[63.71580638, 69.57673795, 7.63064373, 32.15683105, 9.05786335],
[65.61434337, 33.2317155, 18.77672384, 30.13527574, 23.22572904]])
lons = np.array([[
116.28695847, 164.1125604, 40.77223701, -113.54699788, 133.15558442
], [-17.18990601, 75.17472034, 12.81618371, -40.75524952, 40.70898002],
[
42.74662341, 164.05671859, -166.58469404,
-58.16684483, -144.97963063
],
[
46.26303645, -167.48682034, 170.28131412,
-17.80502488, -63.9031154
],
[
-107.14829679, -147.66665952, -0.75970554,
77.701768, -130.48677807
]])
lats = np.array([
[-51.53681682, -83.21762788, 5.91008672, 22.51730385, 66.83356427],
[82.78543163, 23.1529456, -7.16337152, -68.23118425, 28.72194953],
[31.03440852, 70.55322517, -83.61780288, 29.88413938, 25.7214828],
[-19.02517922, -19.20958728, -14.7825735, 22.66967876, 67.6089238],
[45.12202477, 61.79674149, 58.71037615, -62.04350423, 13.06405864]
])
time_slot = dt.datetime(1998, 8, 1, 10, 0)
# These are the expected results
results = np.array([[
0., 387.65821593, 51.74080022, 572.48205988, 138.96586013
], [
227.24857818, 105.53045776, 62.24134162, 172.0870564, 64.12902666
], [
63.08646652, 311.21934562, 188.44804188, 526.63931022, 185.84893885
], [82.86856236, 400.6764648, 43.9431259, 46.58056343, 36.04457644],
[
377.85794388, 191.3738223, 27.55002934,
173.54213642, 133.75164285
]])
new_ch = chan.sunzen_corr(time_slot, lonlats=(lons, lats), limit=80.)
self.assertAlmostEqual(np.max(results - new_ch.data), 0.000, places=3)
def test_cmp(self):
"""Comparison of channels.
"""
self.chan = Channel(name="newchan")
self.chan2 = Channel(name="mychan")
self.assertTrue(self.chan > self.chan2)
self.chan = Channel(name="newchan")
self.chan2 = "mychan"
self.assertTrue(self.chan > self.chan2)
self.chan = Channel(name="newchan")
self.chan2 = Channel(name="newchan")
self.assert_(self.chan == self.chan2)
self.chan = Channel(wavelength_range=(1., 2., 3.))
self.chan2 = Channel(name="newchan")
self.assert_(self.chan < self.chan2)
self.chan = Channel(name="newchan")
self.chan2 = Channel(name="_mychan")
self.assert_(self.chan < self.chan2)
self.chan = Channel(name="_newchan")
self.chan2 = Channel(name="mychan")
self.assert_(self.chan > self.chan2)
self.chan = Channel(name=random_string(4),
wavelength_range=(1., 2., 3.))
self.chan2 = Channel(name=random_string(4),
wavelength_range=(4., 5., 6.))
self.assert_(self.chan < self.chan2)
self.chan = Channel(name="_" + random_string(4),
wavelength_range=(1., 2., 3.))
self.chan2 = Channel(name=random_string(4),
wavelength_range=(4., 5., 6.))
self.assert_(self.chan > self.chan2)
def test_init(self):
"""Creation of a channel.
"""
self.assertRaises(ValueError, Channel)
# Name
self.chan = Channel(name="newchan")
self.assertEqual(self.chan.name, "newchan")
self.assertEqual(self.chan.wavelength_range,
[-np.inf, -np.inf, -np.inf])
self.assertEqual(self.chan.resolution, 0)
self.assert_(self.chan.data is None)
numb = int(np.random.uniform(100000))
self.assertRaises(TypeError, Channel, name=numb)
numb = np.random.uniform() * 100000
self.assertRaises(TypeError, Channel, name=numb)
# Resolution
numb = int(np.random.uniform(100000))
self.assertRaises(ValueError, Channel, resolution=numb)
numb = int(np.random.uniform(100000))
self.chan = Channel(name="newchan", resolution=numb)
self.assertEqual(self.chan.name, "newchan")
self.assertEqual(self.chan.wavelength_range,
[-np.inf, -np.inf, -np.inf])
self.assertEqual(self.chan.resolution, numb)
self.assert_(self.chan.data is None)
self.assertRaises(TypeError, Channel, name="newchan", resolution="a")
# Wavelength
numbs = [
np.random.uniform(100),
np.random.uniform(100),
np.random.uniform(100)
]
numbs.sort()
self.chan = Channel(wavelength_range=numbs)
self.assertEqual(self.chan.name, None)
self.assertEqual(self.chan.wavelength_range, numbs)
self.assertEqual(self.chan.resolution, 0)
self.assert_(self.chan.data is None)
self.assertRaises(TypeError, Channel, wavelength_range=numbs[0:1])
numbs.sort(reverse=True)
self.assertRaises(ValueError, Channel, wavelength_range=numbs)
numbs = [
int(np.random.uniform(100)),
int(np.random.uniform(100)),
int(np.random.uniform(100))
]
numbs.sort()
self.assertRaises(TypeError, Channel, wavelength_range=numbs)
self.assertRaises(TypeError,
Channel,
wavelength_range=random_string(4))
numb = np.random.uniform(100000)
self.assertRaises(TypeError, Channel, wavelength_range=numb)
numb = int(np.random.uniform(100000))
self.assertRaises(TypeError, Channel, wavelength_range=numb)
# Data
data = np.random.rand(3, 3)
self.assertRaises(ValueError, Channel, data=data)
self.chan = Channel(name="newchan", data=data)
self.assertEqual(self.chan.name, "newchan")
self.assertEqual(self.chan.wavelength_range,
[-np.inf, -np.inf, -np.inf])
self.assertEqual(self.chan.resolution, 0)
self.assert_(np.all(self.chan.data == data))
mask = np.array(np.random.rand(3, 3) * 2, dtype=int)
data = np.ma.array(data, mask=mask)
self.chan = Channel(name="newchan", data=data)
self.assertEqual(self.chan.name, "newchan")
self.assertEqual(self.chan.wavelength_range,
[-np.inf, -np.inf, -np.inf])
self.assertEqual(self.chan.resolution, 0)
self.assert_(np.all(self.chan.data == data))
self.assertRaises(TypeError,
Channel,
name="newchan",
data=random_string(4))
numb = np.random.uniform(100000)
self.assertRaises(TypeError, Channel, name="newchan", data=numb)
numb = int(np.random.uniform(100000))
self.assertRaises(TypeError, Channel, name="newchan", data=numb)
numbs = [
np.random.uniform(100),
np.random.uniform(100),
np.random.uniform(100)
]
self.assertRaises(TypeError, Channel, name="newchan", data=numbs)
def test_sunzen_corr(self):
"""Test Sun zenith angle correction.
"""
import datetime as dt
chan = Channel(name="test")
original_value = 10.0
chan.data = original_value * np.ones((2, 11))
lats = np.zeros((2, 11)) # equator
lons = np.array([np.linspace(-90, 90, 11), np.linspace(-90, 90, 11)])
# Equinox, so the Sun is at the equator
time_slot = dt.datetime(2014, 3, 20, 16, 57)
new_ch = chan.sunzen_corr(time_slot, lonlats=(lons, lats), limit=80.0)
# Test minimum after correction, accuracy of three decimals is enough
# self.assertTrue(np.abs(10.000 - np.min(new_ch.data)) < 10**-3)
self.assertAlmostEqual(10.000, np.min(new_ch.data), places=3)
# Test maximum after correction
self.assertAlmostEqual(57.588, np.max(new_ch.data), places=3)
# There should be ten values at zenith angle >= 80 deg, and
# these are all equal
self.assertTrue(np.where(new_ch.data == np.max(new_ch.data))[0].shape[0] == 10)
# All values should be larger than the starting values
self.assertTrue(np.all(new_ch.data > original_value))
# Channel name
self.assertEqual(new_ch.name, chan.name + "_SZC")
# Test channel name in the info dict
self.assertEqual(new_ch.name, chan.info["sun_zen_corrected"])
# Test with several locations and arbitrary data
chan = Channel(name="test2")
chan.data = np.array(
[
[0.0, 67.31614275, 49.96271995, 99.41046645, 29.08660989],
[87.61007584, 79.6683524, 53.20397351, 29.88260374, 62.33623915],
[60.49283004, 54.04267222, 32.72365906, 91.44995651, 32.27232955],
[63.71580638, 69.57673795, 7.63064373, 32.15683105, 9.05786335],
[65.61434337, 33.2317155, 18.77672384, 30.13527574, 23.22572904],
]
)
lons = np.array(
[
[116.28695847, 164.1125604, 40.77223701, -113.54699788, 133.15558442],
[-17.18990601, 75.17472034, 12.81618371, -40.75524952, 40.70898002],
[42.74662341, 164.05671859, -166.58469404, -58.16684483, -144.97963063],
[46.26303645, -167.48682034, 170.28131412, -17.80502488, -63.9031154],
[-107.14829679, -147.66665952, -0.75970554, 77.701768, -130.48677807],
]
)
lats = np.array(
[
[-51.53681682, -83.21762788, 5.91008672, 22.51730385, 66.83356427],
[82.78543163, 23.1529456, -7.16337152, -68.23118425, 28.72194953],
[31.03440852, 70.55322517, -83.61780288, 29.88413938, 25.7214828],
[-19.02517922, -19.20958728, -14.7825735, 22.66967876, 67.6089238],
[45.12202477, 61.79674149, 58.71037615, -62.04350423, 13.06405864],
]
)
time_slot = dt.datetime(1998, 8, 1, 10, 0)
# These are the expected results
results = np.array(
[
[0.0, 387.65821593, 51.74080022, 572.48205988, 138.96586013],
[227.24857818, 105.53045776, 62.24134162, 172.0870564, 64.12902666],
[63.08646652, 311.21934562, 188.44804188, 526.63931022, 185.84893885],
[82.86856236, 400.6764648, 43.9431259, 46.58056343, 36.04457644],
[377.85794388, 191.3738223, 27.55002934, 173.54213642, 133.75164285],
]
)
new_ch = chan.sunzen_corr(time_slot, lonlats=(lons, lats), limit=80.0)
self.assertAlmostEqual(np.max(results - new_ch.data), 0.000, places=3)
class TestChannel(unittest.TestCase):
"""Class for testing the Channel class.
"""
chan = None
chan2 = None
def test_init(self):
"""Creation of a channel.
"""
self.assertRaises(ValueError, Channel)
# Name
self.chan = Channel(name="newchan")
self.assertEqual(self.chan.name, "newchan")
self.assertEqual(self.chan.wavelength_range,
[-np.inf, -np.inf, -np.inf])
self.assertEqual(self.chan.resolution, 0)
self.assert_(self.chan.data is None)
numb = int(np.random.uniform(100000))
self.assertRaises(TypeError, Channel, name=numb)
numb = np.random.uniform() * 100000
self.assertRaises(TypeError, Channel, name=numb)
# Resolution
numb = int(np.random.uniform(100000))
self.assertRaises(ValueError, Channel, resolution=numb)
numb = int(np.random.uniform(100000))
self.chan = Channel(name="newchan", resolution=numb)
self.assertEqual(self.chan.name, "newchan")
self.assertEqual(self.chan.wavelength_range,
[-np.inf, -np.inf, -np.inf])
self.assertEqual(self.chan.resolution, numb)
self.assert_(self.chan.data is None)
self.assertRaises(TypeError, Channel, name="newchan", resolution="a")
# Wavelength
numbs = [
np.random.uniform(100),
np.random.uniform(100),
np.random.uniform(100)
]
numbs.sort()
self.chan = Channel(wavelength_range=numbs)
self.assertEqual(self.chan.name, None)
self.assertEqual(self.chan.wavelength_range, numbs)
self.assertEqual(self.chan.resolution, 0)
self.assert_(self.chan.data is None)
self.assertRaises(TypeError, Channel, wavelength_range=numbs[0:1])
numbs.sort(reverse=True)
self.assertRaises(ValueError, Channel, wavelength_range=numbs)
numbs = [
int(np.random.uniform(100)),
int(np.random.uniform(100)),
int(np.random.uniform(100))
]
numbs.sort()
self.assertRaises(TypeError, Channel, wavelength_range=numbs)
self.assertRaises(TypeError,
Channel,
wavelength_range=random_string(4))
numb = np.random.uniform(100000)
self.assertRaises(TypeError, Channel, wavelength_range=numb)
numb = int(np.random.uniform(100000))
self.assertRaises(TypeError, Channel, wavelength_range=numb)
# Data
data = np.random.rand(3, 3)
self.assertRaises(ValueError, Channel, data=data)
self.chan = Channel(name="newchan", data=data)
self.assertEqual(self.chan.name, "newchan")
self.assertEqual(self.chan.wavelength_range,
[-np.inf, -np.inf, -np.inf])
self.assertEqual(self.chan.resolution, 0)
self.assert_(np.all(self.chan.data == data))
mask = np.array(np.random.rand(3, 3) * 2, dtype=int)
data = np.ma.array(data, mask=mask)
self.chan = Channel(name="newchan", data=data)
self.assertEqual(self.chan.name, "newchan")
self.assertEqual(self.chan.wavelength_range,
[-np.inf, -np.inf, -np.inf])
self.assertEqual(self.chan.resolution, 0)
self.assert_(np.all(self.chan.data == data))
self.assertRaises(TypeError,
Channel,
name="newchan",
data=random_string(4))
numb = np.random.uniform(100000)
self.assertRaises(TypeError, Channel, name="newchan", data=numb)
numb = int(np.random.uniform(100000))
self.assertRaises(TypeError, Channel, name="newchan", data=numb)
numbs = [
np.random.uniform(100),
np.random.uniform(100),
np.random.uniform(100)
]
self.assertRaises(TypeError, Channel, name="newchan", data=numbs)
def test_cmp(self):
"""Comparison of channels.
"""
self.chan = Channel(name="newchan")
self.chan2 = Channel(name="mychan")
self.assertTrue(self.chan > self.chan2)
self.chan = Channel(name="newchan")
self.chan2 = "mychan"
self.assertTrue(self.chan > self.chan2)
self.chan = Channel(name="newchan")
self.chan2 = Channel(name="newchan")
self.assert_(self.chan == self.chan2)
self.chan = Channel(wavelength_range=(1., 2., 3.))
self.chan2 = Channel(name="newchan")
self.assert_(self.chan < self.chan2)
self.chan = Channel(name="newchan")
self.chan2 = Channel(name="_mychan")
self.assert_(self.chan < self.chan2)
self.chan = Channel(name="_newchan")
self.chan2 = Channel(name="mychan")
self.assert_(self.chan > self.chan2)
self.chan = Channel(name=random_string(4),
wavelength_range=(1., 2., 3.))
self.chan2 = Channel(name=random_string(4),
wavelength_range=(4., 5., 6.))
self.assert_(self.chan < self.chan2)
self.chan = Channel(name="_" + random_string(4),
wavelength_range=(1., 2., 3.))
self.chan2 = Channel(name=random_string(4),
wavelength_range=(4., 5., 6.))
self.assert_(self.chan > self.chan2)
def test_str(self):
"""String output for a channel.
"""
self.chan = Channel(name="newchan",
wavelength_range=(1., 2., 3.),
resolution=1000)
self.assertEqual(
str(self.chan),
"'newchan: (1.000,2.000,3.000)μm, resolution 1000m,"
" not loaded'")
self.chan.data = np.random.rand(3, 3)
self.assertEqual(
str(self.chan), "'newchan: (1.000,2.000,3.000)μm, "
"shape (3, 3), "
"resolution 1000m'")
def test_is_loaded(self):
"""Check load status of a channel.
"""
data = np.random.rand(3, 3)
self.chan = Channel(name="newchan")
self.assert_(not self.chan.is_loaded())
self.chan = Channel(name="newchan", data=data)
self.assert_(self.chan.is_loaded())
def test_as_image(self):
"""Check the geo_image version of the channel.
"""
data = np.random.rand(3, 3)
self.chan = Channel(name="newchan", data=data)
img = self.chan.as_image(False)
self.assert_(np.allclose(img.channels[0], data))
self.assertEqual(img.mode, "L")
img = self.chan.as_image(True)
self.assertEqual(img.channels[0].max(), 1)
self.assertEqual(img.channels[0].min(), 0)
def test_check_range(self):
"""Check the range of a channel.
"""
self.chan = Channel(name="newchan")
self.assertRaises(ValueError, self.chan.check_range)
numb = np.random.uniform(10)
self.assertRaises(ValueError, self.chan.check_range, numb)
# ndarray
data = np.random.rand(3, 3)
self.chan = Channel(name="newchan", data=data)
min_range = (data.max() - data.min()) / 2
self.assert_(np.all(data == self.chan.check_range(min_range)))
zeros = np.zeros_like(data)
min_range = (data.max() - data.min()) + E
self.assert_(np.all(zeros == self.chan.check_range(min_range)))
# masked array
mask = np.array(np.random.rand(3, 3) * 2, dtype=int)
mask[1, 1] = False
data = np.ma.array(data, mask=mask)
self.chan = Channel(name="newchan", data=data)
min_range = (data.max() - data.min()) / 2
self.assert_(np.all(data == self.chan.check_range(min_range)))
self.assertEquals(data.count(),
self.chan.check_range(min_range).count())
zeros = np.zeros_like(data)
min_range = (data.max() - data.min()) + E
self.assert_(np.all(zeros == self.chan.check_range(min_range)))
data = np.ma.array(data, mask=True)
self.chan = Channel(name="newchan", data=data)
self.assertEquals(0, self.chan.check_range(min_range).count())
self.assertEquals(data.count(),
self.chan.check_range(min_range).count())
# Wrong type arguments
self.assertRaises(TypeError, self.chan.check_range, random_string(4))
self.assertRaises(TypeError, self.chan.check_range,
[np.random.uniform()])
def test_sunzen_corr(self):
'''Test Sun zenith angle correction.
'''
import datetime as dt
chan = Channel(name='test')
original_value = 10.
chan.data = original_value * np.ones((2, 11))
lats = np.zeros((2, 11)) # equator
lons = np.array([np.linspace(-90, 90, 11), np.linspace(-90, 90, 11)])
# Equinox, so the Sun is at the equator
time_slot = dt.datetime(2014, 3, 20, 16, 57)
new_ch = chan.sunzen_corr(time_slot, lonlats=(lons, lats), limit=80.)
# Test minimum after correction, accuracy of three decimals is enough
#self.assertTrue(np.abs(10.000 - np.min(new_ch.data)) < 10**-3)
self.assertAlmostEqual(10.000, np.min(new_ch.data), places=3)
# Test maximum after correction
self.assertAlmostEqual(57.588, np.max(new_ch.data), places=3)
# There should be ten values at zenith angle >= 80 deg, and
# these are all equal
self.assertTrue(np.where(new_ch.data == \
np.max(new_ch.data))[0].shape[0] == 10)
# All values should be larger than the starting values
self.assertTrue(np.all(new_ch.data > original_value))
# Channel name
self.assertEqual(new_ch.name, chan.name + '_SZC')
# Test channel name in the info dict
self.assertEqual(new_ch.name, chan.info['sun_zen_corrected'])
# Test with several locations and arbitrary data
chan = Channel(name='test2')
chan.data = np.array(
[[0., 67.31614275, 49.96271995, 99.41046645, 29.08660989],
[87.61007584, 79.6683524, 53.20397351, 29.88260374, 62.33623915],
[60.49283004, 54.04267222, 32.72365906, 91.44995651, 32.27232955],
[63.71580638, 69.57673795, 7.63064373, 32.15683105, 9.05786335],
[65.61434337, 33.2317155, 18.77672384, 30.13527574, 23.22572904]])
lons = np.array([[
116.28695847, 164.1125604, 40.77223701, -113.54699788, 133.15558442
], [-17.18990601, 75.17472034, 12.81618371, -40.75524952, 40.70898002],
[
42.74662341, 164.05671859, -166.58469404,
-58.16684483, -144.97963063
],
[
46.26303645, -167.48682034, 170.28131412,
-17.80502488, -63.9031154
],
[
-107.14829679, -147.66665952, -0.75970554,
77.701768, -130.48677807
]])
lats = np.array([
[-51.53681682, -83.21762788, 5.91008672, 22.51730385, 66.83356427],
[82.78543163, 23.1529456, -7.16337152, -68.23118425, 28.72194953],
[31.03440852, 70.55322517, -83.61780288, 29.88413938, 25.7214828],
[-19.02517922, -19.20958728, -14.7825735, 22.66967876, 67.6089238],
[45.12202477, 61.79674149, 58.71037615, -62.04350423, 13.06405864]
])
time_slot = dt.datetime(1998, 8, 1, 10, 0)
# These are the expected results
results = np.array([[
0., 387.65821593, 51.74080022, 572.48205988, 138.96586013
], [
227.24857818, 105.53045776, 62.24134162, 172.0870564, 64.12902666
], [
63.08646652, 311.21934562, 188.44804188, 526.63931022, 185.84893885
], [82.86856236, 400.6764648, 43.9431259, 46.58056343, 36.04457644],
[
377.85794388, 191.3738223, 27.55002934,
173.54213642, 133.75164285
]])
new_ch = chan.sunzen_corr(time_slot, lonlats=(lons, lats), limit=80.)
self.assertAlmostEqual(np.max(results - new_ch.data), 0.000, places=3)
class TestChannel(unittest.TestCase):
"""Class for testing the Channel class.
"""
chan = None
chan2 = None
def test_init(self):
"""Creation of a channel.
"""
self.assertRaises(ValueError, Channel)
# Name
self.chan = Channel(name="newchan")
self.assertEqual(self.chan.name, "newchan")
self.assertEqual(self.chan.wavelength_range, [-np.inf, -np.inf, -np.inf])
self.assertEqual(self.chan.resolution, 0)
self.assert_(self.chan.data is None)
numb = int(np.random.uniform(100000))
self.assertRaises(TypeError, Channel, name=numb)
numb = np.random.uniform() * 100000
self.assertRaises(TypeError, Channel, name=numb)
# Resolution
numb = int(np.random.uniform(100000))
self.assertRaises(ValueError, Channel, resolution=numb)
numb = int(np.random.uniform(100000))
self.chan = Channel(name="newchan", resolution=numb)
self.assertEqual(self.chan.name, "newchan")
self.assertEqual(self.chan.wavelength_range, [-np.inf, -np.inf, -np.inf])
self.assertEqual(self.chan.resolution, numb)
self.assert_(self.chan.data is None)
self.assertRaises(TypeError, Channel, name="newchan", resolution="a")
# Wavelength
numbs = [np.random.uniform(100), np.random.uniform(100), np.random.uniform(100)]
numbs.sort()
self.chan = Channel(wavelength_range=numbs)
self.assertEqual(self.chan.name, None)
self.assertEqual(self.chan.wavelength_range, numbs)
self.assertEqual(self.chan.resolution, 0)
self.assert_(self.chan.data is None)
self.assertRaises(TypeError, Channel, wavelength_range=numbs[0:1])
numbs.sort(reverse=True)
self.assertRaises(ValueError, Channel, wavelength_range=numbs)
numbs = [int(np.random.uniform(100)), int(np.random.uniform(100)), int(np.random.uniform(100))]
numbs.sort()
self.assertRaises(TypeError, Channel, wavelength_range=numbs)
self.assertRaises(TypeError, Channel, wavelength_range=random_string(4))
numb = np.random.uniform(100000)
self.assertRaises(TypeError, Channel, wavelength_range=numb)
numb = int(np.random.uniform(100000))
self.assertRaises(TypeError, Channel, wavelength_range=numb)
# Data
data = np.random.rand(3, 3)
self.assertRaises(ValueError, Channel, data=data)
self.chan = Channel(name="newchan", data=data)
self.assertEqual(self.chan.name, "newchan")
self.assertEqual(self.chan.wavelength_range, [-np.inf, -np.inf, -np.inf])
self.assertEqual(self.chan.resolution, 0)
self.assert_(np.all(self.chan.data == data))
mask = np.array(np.random.rand(3, 3) * 2, dtype=int)
data = np.ma.array(data, mask=mask)
self.chan = Channel(name="newchan", data=data)
self.assertEqual(self.chan.name, "newchan")
self.assertEqual(self.chan.wavelength_range, [-np.inf, -np.inf, -np.inf])
self.assertEqual(self.chan.resolution, 0)
self.assert_(np.all(self.chan.data == data))
self.assertRaises(TypeError, Channel, name="newchan", data=random_string(4))
numb = np.random.uniform(100000)
self.assertRaises(TypeError, Channel, name="newchan", data=numb)
numb = int(np.random.uniform(100000))
self.assertRaises(TypeError, Channel, name="newchan", data=numb)
numbs = [np.random.uniform(100), np.random.uniform(100), np.random.uniform(100)]
self.assertRaises(TypeError, Channel, name="newchan", data=numbs)
def test_cmp(self):
"""Comparison of channels.
"""
self.chan = Channel(name="newchan")
self.chan2 = Channel(name="mychan")
self.assertTrue(self.chan > self.chan2)
self.chan = Channel(name="newchan")
self.chan2 = "mychan"
self.assertTrue(self.chan > self.chan2)
self.chan = Channel(name="newchan")
self.chan2 = Channel(name="newchan")
self.assert_(self.chan == self.chan2)
self.chan = Channel(wavelength_range=(1.0, 2.0, 3.0))
self.chan2 = Channel(name="newchan")
self.assert_(self.chan < self.chan2)
self.chan = Channel(name="newchan")
self.chan2 = Channel(name="_mychan")
self.assert_(self.chan < self.chan2)
self.chan = Channel(name="_newchan")
self.chan2 = Channel(name="mychan")
self.assert_(self.chan > self.chan2)
self.chan = Channel(name=random_string(4), wavelength_range=(1.0, 2.0, 3.0))
self.chan2 = Channel(name=random_string(4), wavelength_range=(4.0, 5.0, 6.0))
self.assert_(self.chan < self.chan2)
self.chan = Channel(name="_" + random_string(4), wavelength_range=(1.0, 2.0, 3.0))
self.chan2 = Channel(name=random_string(4), wavelength_range=(4.0, 5.0, 6.0))
self.assert_(self.chan > self.chan2)
def test_str(self):
"""String output for a channel.
"""
self.chan = Channel(name="newchan", wavelength_range=(1.0, 2.0, 3.0), resolution=1000)
self.assertEqual(str(self.chan), "'newchan: (1.000,2.000,3.000)μm, resolution 1000m," " not loaded'")
self.chan.data = np.random.rand(3, 3)
self.assertEqual(str(self.chan), "'newchan: (1.000,2.000,3.000)μm, " "shape (3, 3), " "resolution 1000m'")
def test_is_loaded(self):
"""Check load status of a channel.
"""
data = np.random.rand(3, 3)
self.chan = Channel(name="newchan")
self.assert_(not self.chan.is_loaded())
self.chan = Channel(name="newchan", data=data)
self.assert_(self.chan.is_loaded())
def test_as_image(self):
"""Check the geo_image version of the channel.
"""
data = np.random.rand(3, 3)
self.chan = Channel(name="newchan", data=data)
img = self.chan.as_image(False)
self.assert_(np.allclose(img.channels[0], data))
self.assertEqual(img.mode, "L")
img = self.chan.as_image(True)
self.assertEqual(img.channels[0].max(), 1)
self.assertEqual(img.channels[0].min(), 0)
def test_check_range(self):
"""Check the range of a channel.
"""
self.chan = Channel(name="newchan")
self.assertRaises(ValueError, self.chan.check_range)
numb = np.random.uniform(10)
self.assertRaises(ValueError, self.chan.check_range, numb)
# ndarray
data = np.random.rand(3, 3)
self.chan = Channel(name="newchan", data=data)
min_range = (data.max() - data.min()) / 2
self.assert_(np.all(data == self.chan.check_range(min_range)))
zeros = np.zeros_like(data)
min_range = (data.max() - data.min()) + E
self.assert_(np.all(zeros == self.chan.check_range(min_range)))
# masked array
mask = np.array(np.random.rand(3, 3) * 2, dtype=int)
mask[1, 1] = False
data = np.ma.array(data, mask=mask)
self.chan = Channel(name="newchan", data=data)
min_range = (data.max() - data.min()) / 2
self.assert_(np.all(data == self.chan.check_range(min_range)))
self.assertEquals(data.count(), self.chan.check_range(min_range).count())
zeros = np.zeros_like(data)
min_range = (data.max() - data.min()) + E
self.assert_(np.all(zeros == self.chan.check_range(min_range)))
data = np.ma.array(data, mask=True)
self.chan = Channel(name="newchan", data=data)
self.assertEquals(0, self.chan.check_range(min_range).count())
self.assertEquals(data.count(), self.chan.check_range(min_range).count())
# Wrong type arguments
self.assertRaises(TypeError, self.chan.check_range, random_string(4))
self.assertRaises(TypeError, self.chan.check_range, [np.random.uniform()])
def test_sunzen_corr(self):
"""Test Sun zenith angle correction.
"""
import datetime as dt
chan = Channel(name="test")
original_value = 10.0
chan.data = original_value * np.ones((2, 11))
lats = np.zeros((2, 11)) # equator
lons = np.array([np.linspace(-90, 90, 11), np.linspace(-90, 90, 11)])
# Equinox, so the Sun is at the equator
time_slot = dt.datetime(2014, 3, 20, 16, 57)
new_ch = chan.sunzen_corr(time_slot, lonlats=(lons, lats), limit=80.0)
# Test minimum after correction, accuracy of three decimals is enough
# self.assertTrue(np.abs(10.000 - np.min(new_ch.data)) < 10**-3)
self.assertAlmostEqual(10.000, np.min(new_ch.data), places=3)
# Test maximum after correction
self.assertAlmostEqual(57.588, np.max(new_ch.data), places=3)
# There should be ten values at zenith angle >= 80 deg, and
# these are all equal
self.assertTrue(np.where(new_ch.data == np.max(new_ch.data))[0].shape[0] == 10)
# All values should be larger than the starting values
self.assertTrue(np.all(new_ch.data > original_value))
# Channel name
self.assertEqual(new_ch.name, chan.name + "_SZC")
# Test channel name in the info dict
self.assertEqual(new_ch.name, chan.info["sun_zen_corrected"])
# Test with several locations and arbitrary data
chan = Channel(name="test2")
chan.data = np.array(
[
[0.0, 67.31614275, 49.96271995, 99.41046645, 29.08660989],
[87.61007584, 79.6683524, 53.20397351, 29.88260374, 62.33623915],
[60.49283004, 54.04267222, 32.72365906, 91.44995651, 32.27232955],
[63.71580638, 69.57673795, 7.63064373, 32.15683105, 9.05786335],
[65.61434337, 33.2317155, 18.77672384, 30.13527574, 23.22572904],
]
)
lons = np.array(
[
[116.28695847, 164.1125604, 40.77223701, -113.54699788, 133.15558442],
[-17.18990601, 75.17472034, 12.81618371, -40.75524952, 40.70898002],
[42.74662341, 164.05671859, -166.58469404, -58.16684483, -144.97963063],
[46.26303645, -167.48682034, 170.28131412, -17.80502488, -63.9031154],
[-107.14829679, -147.66665952, -0.75970554, 77.701768, -130.48677807],
]
)
lats = np.array(
[
[-51.53681682, -83.21762788, 5.91008672, 22.51730385, 66.83356427],
[82.78543163, 23.1529456, -7.16337152, -68.23118425, 28.72194953],
[31.03440852, 70.55322517, -83.61780288, 29.88413938, 25.7214828],
[-19.02517922, -19.20958728, -14.7825735, 22.66967876, 67.6089238],
[45.12202477, 61.79674149, 58.71037615, -62.04350423, 13.06405864],
]
)
time_slot = dt.datetime(1998, 8, 1, 10, 0)
# These are the expected results
results = np.array(
[
[0.0, 387.65821593, 51.74080022, 572.48205988, 138.96586013],
[227.24857818, 105.53045776, 62.24134162, 172.0870564, 64.12902666],
[63.08646652, 311.21934562, 188.44804188, 526.63931022, 185.84893885],
[82.86856236, 400.6764648, 43.9431259, 46.58056343, 36.04457644],
[377.85794388, 191.3738223, 27.55002934, 173.54213642, 133.75164285],
]
)
new_ch = chan.sunzen_corr(time_slot, lonlats=(lons, lats), limit=80.0)
self.assertAlmostEqual(np.max(results - new_ch.data), 0.000, places=3)
def load_from_nc4(filename):
"""Load data from a netcdf4 file, cf-satellite v0.1
"""
rootgrp = Dataset(filename, 'r')
try:
rootgrp.satellite_number
warnings.warn("You are loading old style netcdf files...", DeprecationWarning)
except AttributeError:
return _load02(filename)
if not isinstance(rootgrp.satellite_number, str):
satellite_number = "%02d" % rootgrp.satellite_number
else:
satellite_number = str(rootgrp.satellite_number)
time_slot = rootgrp.variables["time"].getValue()[0]
time_slot = num2date(time_slot, TIME_UNITS)
service = str(rootgrp.service)
satellite_name = str(rootgrp.satellite_name)
instrument_name = str(rootgrp.instrument_name)
try:
orbit = str(rootgrp.orbit)
except AttributeError:
orbit = None
try:
scene = GenericFactory.create_scene(satellite_name,
satellite_number,
instrument_name,
time_slot,
orbit,
None,
service)
except NoSectionError:
scene = VisirCompositer(time_slot=time_slot)
scene.satname = satellite_name
scene.number = satellite_number
scene.service = service
for var_name, var in rootgrp.variables.items():
area = None
if var_name.startswith("band_data"):
resolution = var.resolution
str_res = str(int(resolution)) + "m"
names = rootgrp.variables["bandname"+str_res][:]
data = var[:, :, :].astype(var.dtype)
data = np.ma.masked_outside(data,
var.valid_range[0],
var.valid_range[1])
try:
area_var = getattr(var,"grid_mapping")
area_var = rootgrp.variables[area_var]
proj4_dict = {}
for attr, projattr in MAPPING_ATTRIBUTES.items():
try:
the_attr = getattr(area_var, attr)
if projattr == "proj":
proj4_dict[projattr] = PROJNAME[the_attr]
elif(isinstance(projattr, (list, tuple))):
try:
for i, subattr in enumerate(the_attr):
proj4_dict[projattr[i]] = subattr
except TypeError:
proj4_dict[projattr[0]] = the_attr
else:
proj4_dict[projattr] = the_attr
except AttributeError:
pass
x__ = rootgrp.variables["x"+str_res][:]
y__ = rootgrp.variables["y"+str_res][:]
x_pixel_size = abs((x__[1] - x__[0]))
y_pixel_size = abs((y__[1] - y__[0]))
llx = x__[0] - x_pixel_size / 2.0
lly = y__[-1] - y_pixel_size / 2.0
urx = x__[-1] + x_pixel_size / 2.0
ury = y__[0] + y_pixel_size / 2.0
area_extent = (llx, lly, urx, ury)
try:
# create the pyresample areadef
from pyresample.geometry import AreaDefinition
area = AreaDefinition("myareaid", "myareaname",
"myprojid", proj4_dict,
data.shape[1], data.shape[0],
area_extent)
except ImportError:
LOG.warning("Pyresample not found, "
"cannot load area descrition")
except AttributeError:
LOG.debug("No grid mapping found.")
try:
area_var = getattr(var,"coordinates")
coordinates_vars = area_var.split(" ")
lons = None
lats = None
for coord_var_name in coordinates_vars:
coord_var = rootgrp.variables[coord_var_name]
units = getattr(coord_var, "units")
if(coord_var_name.lower().startswith("lon") or
units.lower().endswith("east") or
units.lower().endswith("west")):
lons = coord_var[:]
elif(coord_var_name.lower().startswith("lat") or
units.lower().endswith("north") or
units.lower().endswith("south")):
lats = coord_var[:]
if lons and lats:
try:
from pyresample.geometry import SwathDefinition
area = SwathDefinition(lons=lons, lats=lats)
except ImportError:
LOG.warning("Pyresample not found, "
"cannot load area descrition")
except AttributeError:
LOG.debug("No lon/lat found.")
for i, name in enumerate(names):
name = str(name)
if var.dimensions[0].startswith("band"):
chn_data = data[i, :, :]
elif var.dimensions[1].startswith("band"):
chn_data = data[:, i, :]
elif var.dimensions[2].startswith("band"):
chn_data = data[:, :, i]
else:
raise ValueError("Invalid dimension names for band data")
try:
scene[name] = (chn_data *
rootgrp.variables["scale"+str_res][i] +
rootgrp.variables["offset"+str_res][i])
#FIXME complete this
#scene[name].info
except KeyError:
# build the channel on the fly
from satpy.channel import Channel
wv_var = rootgrp.variables["nominal_wavelength"+str_res]
wb_var = rootgrp.variables[getattr(wv_var, "bounds")]
minmax = wb_var[i]
scene.channels.append(Channel(name,
resolution,
(minmax[0],
wv_var[i][0],
minmax[1])))
scene[name] = (chn_data *
rootgrp.variables["scale"+str_res][i] +
rootgrp.variables["offset"+str_res][i])
if area is not None:
scene[name].area = area
area = None
for attr in rootgrp.ncattrs():
scene.info[attr] = getattr(rootgrp, attr)
scene.add_to_history("Loaded from netcdf4/cf by satpy")
return scene