def test_coordinates_exactly_between_points_in_col_ungridded_to_ungridded_in_2d(
self):
"""
This works out the edge case where the points are exactly in the middle or two or more datapoints.
The nn_horizontal algorithm will start with the first point as the nearest and iterates through the
points finding any points which are closer than the current closest. If two distances were exactly
the same you would expect the first point to be chosen. This doesn't seem to always be the case but is
probably down to floating points errors in the haversine calculation as these test points are pretty
close together. This test is only really for documenting the behaviour for equidistant points.
"""
from cis.collocation.col_implementations import GeneralUngriddedCollocator, nn_horizontal, SepConstraintKdtree
ug_data = mock.make_regular_2d_ungridded_data()
sample_points = UngriddedData.from_points_array([
HyperPoint(2.5, 2.5),
HyperPoint(-2.5, 2.5),
HyperPoint(2.5, -2.5),
HyperPoint(-2.5, -2.5)
])
col = GeneralUngriddedCollocator()
new_data = col.collocate(sample_points, ug_data, SepConstraintKdtree(),
nn_horizontal())[0]
eq_(new_data.data[0], 11.0)
eq_(new_data.data[1], 5.0)
eq_(new_data.data[2], 10.0)
eq_(new_data.data[3], 4.0)
def test_list_ungridded_ungridded_box_mean(self):
ug_data_1 = mock.make_regular_2d_ungridded_data()
ug_data_2 = mock.make_regular_2d_ungridded_data(data_offset=3)
ug_data_2.long_name = 'TOTAL SNOWFALL RATE: LS+CONV KG/M2/S'
ug_data_2.standard_name = 'snowfall_flux'
ug_data_2.metadata._name = 'snow'
data_list = UngriddedDataList([ug_data_1, ug_data_2])
sample_points = mock.make_regular_2d_ungridded_data()
constraint = SepConstraintKdtree('500km')
kernel = moments()
col = GeneralUngriddedCollocator()
output = col.collocate(sample_points, data_list, constraint, kernel)
expected_result = np.array(list(range(1, 16)))
expected_n = np.array(15 * [1])
assert len(output) == 6
assert isinstance(output, UngriddedDataList)
assert output[3].var_name == 'snow'
assert output[4].var_name == 'snow_std_dev'
assert output[5].var_name == 'snow_num_points'
assert np.allclose(output[0].data, expected_result)
assert all(output[1].data.mask)
assert np.allclose(output[2].data, expected_n)
assert np.allclose(output[3].data, expected_result + 3)
assert all(output[4].data.mask)
assert np.allclose(output[5].data, expected_n)
def test_basic_col_in_4d(self):
from cis.collocation.col_implementations import GeneralUngriddedCollocator, nn_altitude, SepConstraintKdtree
import datetime as dt
ug_data = mock.make_regular_4d_ungridded_data()
sample_points = HyperPointList()
sample_points.append(
HyperPoint(lat=1.0,
lon=1.0,
alt=12.0,
t=dt.datetime(1984, 8, 29, 8, 34)))
sample_points.append(
HyperPoint(lat=4.0,
lon=4.0,
alt=34.0,
t=dt.datetime(1984, 9, 2, 1, 23)))
sample_points.append(
HyperPoint(lat=-4.0,
lon=-4.0,
alt=89.0,
t=dt.datetime(1984, 9, 4, 15, 54)))
sample_points = UngriddedData.from_points_array(sample_points)
col = GeneralUngriddedCollocator()
new_data = col.collocate(sample_points, ug_data, SepConstraintKdtree(),
nn_altitude())[0]
eq_(new_data.data[0], 6.0)
eq_(new_data.data[1], 16.0)
eq_(new_data.data[2], 46.0)
def test_coordinates_outside_grid_in_col_ungridded_to_ungridded_in_2d(
self):
from cis.collocation.col_implementations import GeneralUngriddedCollocator, nn_pressure, SepConstraintKdtree
import datetime as dt
ug_data = mock.make_regular_4d_ungridded_data()
sample_points = HyperPointList()
sample_points.append(
HyperPoint(lat=0.0,
lon=0.0,
pres=0.1,
t=dt.datetime(1984, 8, 29, 8, 34)))
sample_points.append(
HyperPoint(lat=0.0,
lon=0.0,
pres=91.0,
t=dt.datetime(1984, 9, 2, 1, 23)))
sample_points.append(
HyperPoint(lat=0.0,
lon=0.0,
pres=890.0,
t=dt.datetime(1984, 9, 4, 15, 54)))
sample_points = UngriddedData.from_points_array(sample_points)
col = GeneralUngriddedCollocator()
new_data = col.collocate(sample_points, ug_data, SepConstraintKdtree(),
nn_pressure())[0]
eq_(new_data.data[0], 1.0)
eq_(new_data.data[1], 46.0)
eq_(new_data.data[2], 46.0)
def test_already_collocated_in_col_ungridded_to_ungridded_in_2d(self):
ug_data = mock.make_regular_2d_ungridded_data()
# This point already exists on the cube with value 5 - which shouldn't be a problem
sample_points = UngriddedData.from_points_array([HyperPoint(0.0, 0.0)])
col = GeneralUngriddedCollocator(fill_value=-999)
new_data = col.collocate(sample_points, ug_data, SepConstraintKdtree(),
nn_horizontal_only())[0]
eq_(new_data.data[0], 8.0)
def test_basic_col_with_incompatible_points_throws_a_TypeError(self):
from cis.collocation.col_implementations import GeneralUngriddedCollocator, nn_pressure, SepConstraintKdtree
ug_data = mock.make_regular_4d_ungridded_data()
# Make sample points with no time dimension specified
sample_points = UngriddedData.from_points_array([
HyperPoint(1.0, 1.0),
HyperPoint(4.0, 4.0),
HyperPoint(-4.0, -4.0)
])
col = GeneralUngriddedCollocator()
with self.assertRaises(AttributeError):
new_data = col.collocate(sample_points, ug_data,
SepConstraintKdtree(), nn_pressure())[0]
def test_basic_col_in_2d(self):
# lat: -10 to 10 step 5; lon -5 to 5 step 5
ug_data = mock.make_regular_2d_ungridded_data()
sample_points = UngriddedData.from_points_array([
HyperPoint(lat=1.0, lon=1.0),
HyperPoint(lat=4.0, lon=4.0),
HyperPoint(lat=-4.0, lon=-4.0)
])
col = GeneralUngriddedCollocator(fill_value=-999)
new_data = col.collocate(sample_points, ug_data, SepConstraintKdtree(),
nn_horizontal_only())[0]
eq_(new_data.data[0], 8.0)
eq_(new_data.data[1], 12.0)
eq_(new_data.data[2], 4.0)
def test_already_collocated_in_col_ungridded_to_ungridded_in_2d(self):
from cis.collocation.col_implementations import GeneralUngriddedCollocator, nn_pressure, SepConstraintKdtree
import datetime as dt
ug_data = mock.make_regular_4d_ungridded_data()
sample_points = UngriddedData.from_points_array([
HyperPoint(lat=0.0,
lon=0.0,
pres=80.0,
t=dt.datetime(1984, 9, 4, 15, 54))
])
col = GeneralUngriddedCollocator()
new_data = col.collocate(sample_points, ug_data, SepConstraintKdtree(),
nn_pressure())[0]
eq_(new_data.data[0], 41.0)
def test_basic_col_in_2d(self):
from cis.collocation.col_implementations import GeneralUngriddedCollocator, nn_horizontal, SepConstraintKdtree
ug_data = mock.make_regular_2d_ungridded_data()
sample_points = UngriddedData.from_points_array([
HyperPoint(lat=1.0, lon=1.0),
HyperPoint(lat=4.0, lon=4.0),
HyperPoint(lat=-4.0, lon=-4.0)
])
col = GeneralUngriddedCollocator()
new_data = col.collocate(sample_points, ug_data, SepConstraintKdtree(),
nn_horizontal())[0]
eq_(new_data.data[0], 8.0)
eq_(new_data.data[1], 12.0)
eq_(new_data.data[2], 4.0)
def test_coordinates_outside_grid_in_col_ungridded_to_ungridded_in_2d(
self):
ug_data = mock.make_regular_2d_ungridded_data()
sample_points = UngriddedData.from_points_array([
HyperPoint(5.5, 5.5),
HyperPoint(-5.5, 5.5),
HyperPoint(5.5, -5.5),
HyperPoint(-5.5, -5.5)
])
col = GeneralUngriddedCollocator(fill_value=-999)
new_data = col.collocate(sample_points, ug_data, SepConstraintKdtree(),
nn_horizontal_only())[0]
eq_(new_data.data[0], 12.0)
eq_(new_data.data[1], 6.0)
eq_(new_data.data[2], 10.0)
eq_(new_data.data[3], 4.0)
def test_basic_col_in_4d(self):
from cis.collocation.col_implementations import GeneralUngriddedCollocator, mean, SepConstraintKdtree
import datetime as dt
ug_data = mock.make_regular_4d_ungridded_data()
# Note - This isn't actually used for averaging
sample_points = UngriddedData.from_points_array([
HyperPoint(lat=1.0,
lon=1.0,
alt=12.0,
t=dt.datetime(1984, 8, 29, 8, 34))
])
col = GeneralUngriddedCollocator()
new_data = col.collocate(sample_points, ug_data, SepConstraintKdtree(),
mean())[0]
eq_(new_data.data[0], 25.5)
def test_averaging_basic_col_in_4d(self):
ug_data = mock.make_regular_4d_ungridded_data()
# Note - This isn't actually used for averaging
sample_points = UngriddedData.from_points_array(
[HyperPoint(lat=1.0, lon=1.0, alt=12.0, t=dt.datetime(1984, 8, 29, 8, 34))])
col = GeneralUngriddedCollocator()
new_data = col.collocate(sample_points, ug_data, SepConstraintKdtree(), moments())
means = new_data[0]
std_dev = new_data[1]
no_points = new_data[2]
eq_(means.name(), 'rainfall_flux')
eq_(std_dev.name(), 'Corrected sample standard deviation of TOTAL RAINFALL RATE: LS+CONV KG/M2/S')
eq_(no_points.name(), 'Number of points used to calculate the mean of TOTAL RAINFALL RATE: LS+CONV KG/M2/S')
assert means.coords()
assert std_dev.coords()
assert no_points.coords()
def test_already_collocated_in_col_ungridded_to_ungridded_in_2d(self):
from cis.collocation.col_implementations import GeneralUngriddedCollocator, nn_time, SepConstraintKdtree
import datetime as dt
import numpy as np
ug_data = mock.make_regular_2d_with_time_ungridded_data()
sample_points = HyperPointList()
t0 = dt.datetime(1984, 8, 27)
for d in range(15):
sample_points.append(
HyperPoint(lat=0.0, lon=0.0, t=t0 + dt.timedelta(days=d)))
sample_points = UngriddedData.from_points_array(sample_points)
col = GeneralUngriddedCollocator()
new_data = col.collocate(sample_points, ug_data, SepConstraintKdtree(),
nn_time())[0]
assert (np.equal(new_data.data, np.arange(15) + 1.0).all())
def test_coordinates_exactly_between_points_in_col_ungridded_to_ungridded_in_2d(
self):
"""
This works out the edge case where the points are exactly in the middle or two or more datapoints.
The nn_time algorithm will start with the first point as the nearest and iterates through the
points finding any points which are closer than the current closest. If two distances were exactly
the same the first point to be chosen.
"""
from cis.collocation.col_implementations import GeneralUngriddedCollocator, nn_time, SepConstraintKdtree
import datetime as dt
ug_data = mock.make_regular_2d_with_time_ungridded_data()
# Choose a time at midday
sample_points = UngriddedData.from_points_array(
[HyperPoint(lat=0.0, lon=0.0, t=dt.datetime(1984, 8, 29, 12))])
col = GeneralUngriddedCollocator()
new_data = col.collocate(sample_points, ug_data, SepConstraintKdtree(),
nn_time())[0]
eq_(new_data.data[0], 3.0)
def test_ungridded_ungridded_box_moments_no_missing_data_for_missing_sample(self):
data = mock.make_regular_2d_ungridded_data()
sample = UngriddedData.from_points_array(
[HyperPoint(lat=1.0, lon=1.0, alt=12.0, t=dt.datetime(1984, 8, 29, 8, 34)),
HyperPoint(lat=3.0, lon=3.0, alt=7.0, t=dt.datetime(1984, 8, 29, 8, 34)),
HyperPoint(lat=-1.0, lon=-1.0, alt=5.0, t=dt.datetime(1984, 8, 29, 8, 34))])
constraint = SepConstraintKdtree('500km')
kernel = moments()
sample_mask = [False, True, False]
sample.data = np.ma.array([0, 0, 0], mask=sample_mask)
col = GeneralUngriddedCollocator(missing_data_for_missing_sample=False)
output = col.collocate(sample, data, constraint, kernel)
assert len(output) == 3
assert isinstance(output, UngriddedDataList)
assert not any(output[0].data.mask)
assert not any(output[1].data.mask)
assert not any(output[2].data.mask)
def test_coordinates_outside_grid_in_col_ungridded_to_ungridded_in_2d(
self):
from cis.collocation.col_implementations import GeneralUngriddedCollocator, nn_time, SepConstraintKdtree
import datetime as dt
ug_data = mock.make_regular_2d_with_time_ungridded_data()
sample_points = HyperPointList()
sample_points.append(
HyperPoint(lat=0.0, lon=0.0, t=dt.datetime(1984, 8, 26)))
sample_points.append(
HyperPoint(lat=0.0, lon=0.0, t=dt.datetime(1884, 8, 26)))
sample_points.append(
HyperPoint(lat=0.0, lon=0.0, t=dt.datetime(1994, 8, 27)))
sample_points = UngriddedData.from_points_array(sample_points)
col = GeneralUngriddedCollocator()
new_data = col.collocate(sample_points, ug_data, SepConstraintKdtree(),
nn_time())[0]
eq_(new_data.data[0], 1.0)
eq_(new_data.data[1], 1.0)
eq_(new_data.data[2], 15.0)
def test_ungridded_ungridded_box_moments(self):
data = mock.make_regular_2d_ungridded_data()
sample = UngriddedData.from_points_array(
[HyperPoint(lat=1.0, lon=1.0, alt=12.0, t=dt.datetime(1984, 8, 29, 8, 34)),
HyperPoint(lat=3.0, lon=3.0, alt=7.0, t=dt.datetime(1984, 8, 29, 8, 34)),
HyperPoint(lat=-1.0, lon=-1.0, alt=5.0, t=dt.datetime(1984, 8, 29, 8, 34))])
constraint = SepConstraintKdtree('500km')
kernel = moments()
col = GeneralUngriddedCollocator()
output = col.collocate(sample, data, constraint, kernel)
expected_result = np.array([28.0/3, 10.0, 20.0/3])
expected_stddev = np.array([1.52752523, 1.82574186, 1.52752523])
expected_n = np.array([3, 4, 3])
assert len(output) == 3
assert isinstance(output, UngriddedDataList)
assert np.allclose(output[0].data, expected_result)
assert np.allclose(output[1].data, expected_stddev)
assert np.allclose(output[2].data, expected_n)
def test_basic_col_with_time(self):
from cis.collocation.col_implementations import GeneralUngriddedCollocator, nn_time, SepConstraintKdtree
import numpy as np
ug_data = mock.make_MODIS_time_steps()
ref = np.array([0.0, 1.0, 2.0, 3.0])
sample_points = HyperPointList()
sample_points.append(HyperPoint(lat=0.0, lon=0.0, t=149751.369618055))
sample_points.append(HyperPoint(
lat=0.0,
lon=0.0,
t=149759.378055556,
))
sample_points.append(HyperPoint(lat=0.0, lon=0.0, t=149766.373969907))
sample_points.append(HyperPoint(lat=0.0, lon=0.0, t=149776.375995371))
sample_points = UngriddedData.from_points_array(sample_points)
col = GeneralUngriddedCollocator()
new_data = col.collocate(sample_points, ug_data, SepConstraintKdtree(),
nn_time())[0]
assert (np.equal(new_data.data, ref).all())
def test_basic_col_in_4d_with_pressure_not_altitude(self):
from cis.collocation.col_implementations import GeneralUngriddedCollocator, moments, SepConstraintKdtree
import datetime as dt
ug_data = mock.make_regular_4d_ungridded_data()
# Note - This isn't actually used for averaging
sample_points = UngriddedData.from_points_array([
HyperPoint(lat=1.0,
lon=1.0,
pres=12.0,
t=dt.datetime(1984, 8, 29, 8, 34))
])
col = GeneralUngriddedCollocator()
new_data = col.collocate(sample_points, ug_data, SepConstraintKdtree(),
moments())
means = new_data[0]
std_dev = new_data[1]
no_points = new_data[2]
eq_(means.data[0], 25.5)
assert_almost_equal(std_dev.data[0], np.sqrt(212.5))
eq_(no_points.data[0], 50)
