def test_rasterize(tmpdir):
path = str(tmpdir.join('polygons.shp'))
ds = generate_test_dataset(dims=dict(x=100, y=100, time=5))
df = generate_test_geodataframe()
schema = gpd.io.file.infer_schema(df)
schema['properties']['date'] = 'date'
df.to_file(path, schema=schema)
# Rasterize
raster = vector.rasterize(path, ds)
# Check that the raster contains all fields as variables
assert set(raster.data_vars).union({'geometry'}) == set(df.columns)
# Check dtypes
assert np.issubdtype(raster.float.dtype, np.floating)
assert np.issubdtype(raster.integer.dtype, np.signedinteger)
assert np.issubdtype(raster.category.dtype, np.signedinteger)
# Check that extent, projection etc. are identical to the reference raster
assert_equal(warp.get_bounds(raster), warp.get_bounds(ds))
assert_equal_crs(warp.get_crs(raster), warp.get_crs(ds))
assert_equal(warp.get_transform(raster), warp.get_transform(ds))
# Check raster content
shape = (ds.dims['y'], ds.dims['x'])
transform = warp.get_transform(ds)
for i, row in df.iterrows():
poly = row['geometry']
mask = rasterio.features.rasterize([poly],
out_shape=shape,
transform=transform)
# Erode mask to avoid edge effects
mask = ndimage.morphology.binary_erosion(mask) == 1
for v in raster.data_vars:
if 'legend' in raster[v].attrs:
expected = sorted(raster[v].attrs['legend'],
key=lambda x: x[1] == str(row[v]))[-1][0]
else:
expected = row[v]
values = raster[v].isel(time=0).values
values[mask]
assert_allclose(values[mask], expected)
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)