def test_reprojection_failure():
ds = generate_test_dataset()
transform = warp.get_transform(ds)
extent = warp.get_extent(ds)
with assert_raises_regex(
ValueError, ".* must also specify the `width` and `height`.*"):
_ = warp.Reprojection(crs=epsg4326, transform=transform)
with assert_raises_regex(
ValueError, "Need to provide either `width` and `height` .*"):
_ = warp.Reprojection(crs=epsg4326, extent=extent)
def test_reprojection_nan_values():
src_crs = epsg4326
dst_crs = sinusoidal
ds = generate_test_dataset(crs=src_crs)
bounds = warp.get_bounds(ds)
proj = warp.Reprojection(crs=dst_crs)
warped = proj.apply(ds)
xgrid, ygrid = np.meshgrid(warped.x, warped.y)
lon, lat = rasterio.warp.transform(dst_crs, src_crs, xgrid.flatten(),
ygrid.flatten())
lon = np.array(lon).reshape(xgrid.shape)
lat = np.array(lat).reshape(ygrid.shape)
inside_bounds = np.logical_and(
np.logical_and(lon >= bounds.left, lon <= bounds.right),
np.logical_and(lat >= bounds.bottom, lat <= bounds.top)
)
for v in warped.data_vars:
if not set(warped[v].dims).issuperset({'y', 'x'}):
continue
dim_order = tuple(set(warped[v].dims) - {'y', 'x'}) + ('y', 'x')
values = warped[v].transpose(*dim_order, transpose_coords=True).values
# Check that pixels strictly inside the original bounds are not NaN
assert np.isnan(values[..., inside_bounds]).sum() == 0
# Pixel outside of the original bounds should be mostly NaN,
# although some pixels near the edges may have values.
outside_values = values[..., ~inside_bounds]
assert np.isnan(outside_values).sum() / outside_values.size > 0.5
def test_reprojection_with_target(generator):
src_crs = epsg4326
dst_crs = sinusoidal
ds = generator(crs=src_crs)
src_bounds = warp.get_bounds(ds)
dst_bounds_latlon = BoundingBox(
left=src_bounds.left - 1,
bottom=src_bounds.bottom - 1,
right=src_bounds.right + 1,
top=src_bounds.top + 1,
)
dst_bounds = BoundingBox(*rasterio.warp.transform_bounds(
src_crs, dst_crs, **dst_bounds_latlon._asdict()
))
dst_width, dst_height = 35, 21
resx = (dst_bounds.right - dst_bounds.left) / (dst_width - 1)
resy = (dst_bounds.bottom - dst_bounds.top) / (dst_height - 1)
res = (abs(resx), abs(resy))
xoff = dst_bounds.left
yoff = dst_bounds.top
dst_transform = Affine(resx, 0, xoff, 0, resy, yoff)
target = generator(
dims={'x': dst_width, 'y': dst_height, 'time': 1},
extent=dst_bounds, crs=dst_crs
)
projected = [
warp.Reprojection(crs=dst_crs, transform=dst_transform,
width=dst_width, height=dst_height).apply(ds),
warp.Reprojection(crs=dst_crs, extent=dst_bounds,
res=res).apply(ds),
warp.Reprojection(crs=dst_crs, extent=dst_bounds,
width=dst_width, height=dst_height).apply(ds),
warp.Reprojection(target=target).apply(ds),
]
for i, proj in enumerate(projected[1:]):
print(i)
xr_assert_equal(proj, projected[0])
assert_almost_equal(warp.get_resolution(proj), res)
assert_almost_equal(warp.get_bounds(proj), dst_bounds)
assert_almost_equal(warp.get_transform(proj), dst_transform)
assert_equal_crs(warp.get_crs(proj), dst_crs)
def test_reprojection_with_src_crs():
src_crs = epsg4326
dst_crs = sinusoidal
# Set up test dataset with and without CRS information
ds = generate_test_dataset(crs=src_crs)
assert_equal_crs(src_crs, ds.nd.crs)
ds_nocrs = ds.copy()
del ds_nocrs.attrs['crs']
assert ds_nocrs.nd.crs is None
with assert_raises_regex(
CRSError,
"Could not infer projection from input data. "
"Please provide the parameter `src_crs`."):
warp.Reprojection(dst_crs=dst_crs).apply(ds_nocrs)
xr_assert_equal(
warp.Reprojection(dst_crs=dst_crs).apply(ds),
warp.Reprojection(src_crs=src_crs, dst_crs=dst_crs).apply(ds_nocrs)
)
def test_reproject_coordinates():
ds = generate_test_dataset(crs=epsg4326)
dims = warp.get_dim_sizes(ds)
ds.coords['lat'] = ds['y']
ds.coords['lon'] = ds['x']
ds.coords['altitude'] = (('y', 'x'),
np.zeros((dims['y'], dims['x'])))
proj = warp.Reprojection(crs=sinusoidal)
warped = proj.apply(ds)
for c in ds.coords:
if c in ['lat', 'lon']:
continue
assert c in warped.coords
assert_equal(sorted(ds[c].dims), sorted(warped[c].dims))
def test_reproject_one_dimensional_coords():
ds = generate_test_dataset(crs=epsg4326)
# Add coordinates that are not dimensions
ds.coords['longitude'] = (('x',), ds.x.values)
ds.coords['latitude'] = (('y',), ds.y.values)
warped = warp.Reprojection(
crs=warp.get_crs(ds), width=15, height=15,
resampling=rasterio.warp.Resampling.bilinear
).apply(ds)
# Check that xvar and yvar are still proportional to longitude
# and latitude
for coord, dim in [
('longitude', 'x'), ('latitude', 'y')
]:
assert_array_almost_equal(
warped.coords[coord], warped.coords[dim])
def test_reproject_with_extra_dims(dims):
crs1 = warp._parse_crs('epsg:4326')
crs2 = warp._parse_crs('epsg:3395')
ds = generate_test_dataset(
dims=dims, crs=crs1
)
proj = warp.Reprojection(crs=crs2)
reprojected = proj.apply(ds)
# Check that a reprojected slice of the dataset is the same as
# the slice of the reprojection of the entire dataset.
slices = [
{'band': 3},
{'time': slice(1, 3)}
]
for s in slices:
xr_assert_equal(
proj.apply(ds.isel(**s)),
reprojected.isel(**s)
)
def test_reproject_one_dimensional_vars():
ds = generate_test_dataset(crs=epsg4326)
ds['xvar'] = (('x',), ds.x.values * 10)
ds['yvar'] = (('y',), ds.y.values * 10)
ds['timevar'] = (('time',), np.random.rand(ds.dims['time']))
warped = warp.Reprojection(
crs=sinusoidal, resampling=rasterio.warp.Resampling.bilinear
).apply(ds)
xr_assert_equal(
warped['timevar'], ds['timevar'])
# Check that xvar and yvar are still proportional to longitude
# and latitude
for v, coord in [
('xvar', 'lon'), ('yvar', 'lat')
]:
ratios = warped[v].values / warped[coord].values
print(v, coord)
print(np.nanmin(ratios), np.nanmax(ratios), np.nanstd(ratios))
# There is quite a bit of error, for now accept relatively
# high error.
assert np.nanstd(ratios) < 1.5
def test_get_common_extent():
bounds = [
(-10.0, 50.0, 0.0, 60.0),
(-12.0, 40.0, -2.0, 52.0),
(-13.0, 50.0, -3.0, 60.0),
(-9.0, 51.0, 1.0, 61.0)
]
common_extent = (-13.0, 40.0, 1.0, 61.0)
datasets = [generate_test_dataset(extent=ext) for ext in bounds]
# Reproject such that the projected bounds change,
# but the extent remains the same:
proj = warp.Reprojection(crs=sinusoidal)
datasets_sinu = [proj.apply(ds) for ds in datasets]
common_bounds = warp.get_common_bounds(datasets_sinu)
expected_result = BoundingBox(*rasterio.warp.transform_bounds(
sinusoidal, epsg4326, **common_bounds._asdict()
))
assert_raises(AssertionError, assert_equal,
common_bounds, common_extent)
assert_almost_equal(warp.get_common_extent(datasets_sinu),
expected_result)
def test_reprojection(name, kwargs):
ds = generate_test_dataset(**kwargs)
crs = warp._parse_crs('epsg:4326')
proj = warp.Reprojection(crs=crs)
reprojected = proj.apply(ds)
assert_equal_crs(crs, warp.get_crs(reprojected))
