def test_make_mesh():
"""Basic test for creating :meth:`~esmf_regrid.esmf_regridder.GridInfo.make_esmf_field`."""
coords, nodes, _ = _make_small_mesh_args()
mesh_0 = MeshInfo(coords, nodes, 0)
esmf_mesh_0 = mesh_0.make_esmf_field()
esmf_mesh_0.data[:] = 0
relative_path = (
"experimental",
"unstructured_regrid",
"test_MeshInfo",
"small_mesh.txt",
)
fname = get_result_path(relative_path)
with open(fname) as file:
expected_repr = file.read()
one_indexed_nodes = nodes + 1
mesh_1 = MeshInfo(coords, one_indexed_nodes, 1)
esmf_mesh_1 = mesh_1.make_esmf_field()
esmf_mesh_1.data[:] = 0
assert esmf_mesh_0.__repr__() == esmf_mesh_1.__repr__() == expected_repr
def _mesh_to_MeshInfo(mesh, location):
# Returns a MeshInfo object describing the mesh of the cube.
assert mesh.topology_dimension == 2
if None in mesh.face_coords:
elem_coords = None
else:
elem_coords = np.stack([coord.points for coord in mesh.face_coords], axis=-1)
meshinfo = MeshInfo(
np.stack([coord.points for coord in mesh.node_coords], axis=-1),
mesh.face_node_connectivity.indices_by_location(),
mesh.face_node_connectivity.start_index,
elem_coords=elem_coords,
location=location,
)
return meshinfo
def test_expanded_lons_with_mesh():
"""
Basic test for regridding with :meth:`~esmf_regrid.esmf_regridder.RefinedGridInfo.make_esmf_field`.
Mirrors the tests in :func:`~esmf_regrid.tests.unit.experimental.unstructured_regrid.test_MeshInfo.test_regrid_with_mesh`
but with slightly different expected values due to increased accuracy.
"""
mesh_args = _make_small_mesh_args()
mesh = MeshInfo(*mesh_args)
grid_args = make_grid_args(2, 3)
grid = RefinedGridInfo(*grid_args[2:4], resolution=4)
mesh_to_grid_regridder = Regridder(mesh, grid)
mesh_input = np.array([3, 2])
grid_output = mesh_to_grid_regridder.regrid(mesh_input)
expected_grid_output = np.array([
[2.671534474734418, 3.0],
[2.088765949748455, 2.922517356506756],
[2.0, 2.340882413622917],
])
assert ma.allclose(expected_grid_output, grid_output)
grid_to_mesh_regridder = Regridder(grid, mesh)
grid_input = np.array([[0, 0], [1, 0], [2, 1]])
mesh_output = grid_to_mesh_regridder.regrid(grid_input)
expected_mesh_output = np.array([0.14117205318254747, 1.1976140197893996])
assert ma.allclose(expected_mesh_output, mesh_output)
def _give_extra_dims(array):
result = np.stack([array, array + 1])
result = np.stack([result, result + 10, result + 100])
return result
extra_dim_mesh_input = _give_extra_dims(mesh_input)
extra_dim_grid_output = mesh_to_grid_regridder.regrid(extra_dim_mesh_input)
extra_dim_expected_grid_output = _give_extra_dims(expected_grid_output)
assert ma.allclose(extra_dim_expected_grid_output, extra_dim_grid_output)
extra_dim_grid_input = _give_extra_dims(grid_input)
extra_dim_mesh_output = grid_to_mesh_regridder.regrid(extra_dim_grid_input)
extra_dim_expected_mesh_output = _give_extra_dims(expected_mesh_output)
assert ma.allclose(extra_dim_expected_mesh_output, extra_dim_mesh_output)
def test_regrid_with_mesh():
"""Basic test for regridding with :meth:`~esmf_regrid.esmf_regridder.GridInfo.make_esmf_field`."""
mesh_args = _make_small_mesh_args()
mesh = MeshInfo(*mesh_args)
grid_args = make_grid_args(2, 3)
grid = GridInfo(*grid_args)
mesh_to_grid_regridder = Regridder(mesh, grid)
mesh_input = np.array([3, 2])
grid_output = mesh_to_grid_regridder.regrid(mesh_input)
expected_grid_output = np.array([
[2.671294712940605, 3.0],
[2.0885553467353097, 2.9222786250561574],
[2.0, 2.3397940801753307],
])
assert ma.allclose(expected_grid_output, grid_output)
grid_to_mesh_regridder = Regridder(grid, mesh)
grid_input = np.array([[0, 0], [1, 0], [2, 1]])
mesh_output = grid_to_mesh_regridder.regrid(grid_input)
expected_mesh_output = np.array([0.1408245341331448, 1.19732762534643])
assert ma.allclose(expected_mesh_output, mesh_output)
def _give_extra_dims(array):
result = np.stack([array, array + 1])
result = np.stack([result, result + 10, result + 100])
return result
extra_dim_mesh_input = _give_extra_dims(mesh_input)
extra_dim_grid_output = mesh_to_grid_regridder.regrid(extra_dim_mesh_input)
extra_dim_expected_grid_output = _give_extra_dims(expected_grid_output)
assert ma.allclose(extra_dim_expected_grid_output, extra_dim_grid_output)
extra_dim_grid_input = _give_extra_dims(grid_input)
extra_dim_mesh_output = grid_to_mesh_regridder.regrid(extra_dim_grid_input)
extra_dim_expected_mesh_output = _give_extra_dims(expected_mesh_output)
assert ma.allclose(extra_dim_expected_mesh_output, extra_dim_mesh_output)
def test_expanded_lats_with_mesh():
"""Basic test for regridding with :meth:`~esmf_regrid.esmf_regridder.RefinedGridInfo.make_esmf_field`."""
mesh_args = _make_small_mesh_args()
mesh = MeshInfo(*mesh_args)
grid = RefinedGridInfo(np.array([0, 5, 10]),
np.array([-90, 90]),
resolution=4)
mesh_to_grid_regridder = Regridder(mesh, grid)
mesh_input = np.array([3, 2])
grid_output = mesh_to_grid_regridder.regrid(mesh_input)
expected_grid_output = np.array([
[2.2024695514629724, 2.4336888097502642],
])
assert ma.allclose(expected_grid_output, grid_output)
grid_to_mesh_regridder = Regridder(grid, mesh)
grid_input = np.array([[1, 2]])
mesh_output = grid_to_mesh_regridder.regrid(grid_input)
expected_mesh_output = np.array([1.7480791292591336, 1.496070008348207])
assert ma.allclose(expected_mesh_output, mesh_output)
def _give_extra_dims(array):
result = np.stack([array, array + 1])
result = np.stack([result, result + 10, result + 100])
return result
extra_dim_mesh_input = _give_extra_dims(mesh_input)
extra_dim_grid_output = mesh_to_grid_regridder.regrid(extra_dim_mesh_input)
extra_dim_expected_grid_output = _give_extra_dims(expected_grid_output)
assert ma.allclose(extra_dim_expected_grid_output, extra_dim_grid_output)
extra_dim_grid_input = _give_extra_dims(grid_input)
extra_dim_mesh_output = grid_to_mesh_regridder.regrid(extra_dim_grid_input)
extra_dim_expected_mesh_output = _give_extra_dims(expected_mesh_output)
assert ma.allclose(extra_dim_expected_mesh_output, extra_dim_mesh_output)
def test_regrid_bilinear_with_mesh():
"""Basic test for regridding with :meth:`~esmf_regrid.esmf_regridder.GridInfo.make_esmf_field`."""
# We create a mesh with the following shape:
# 20 ,+ ,+ 4
# / | with nodes: / |
# 10 +' ,+ 1 +' ,+ 3
# | / | | / |
# 0 +---+ 0 +---+ 2
# 0 10
mesh_args = _make_small_mesh_args()
elem_coords = np.array([[5, 0], [5, 10]])
node_mesh = MeshInfo(*mesh_args, location="node")
face_mesh = MeshInfo(*mesh_args, elem_coords=elem_coords, location="face")
# We create a grid with the following shape:
# 20/3 +---+
# | |
# 10/3 +---+
# | |
# 0 +---+
# 0 10
grid_args = [ar * 2 for ar in make_grid_args(2, 3)]
grid = GridInfo(*grid_args, center=True)
mesh_to_grid_regridder = Regridder(node_mesh, grid, method="bilinear")
mesh_input = np.arange(5)
grid_output = mesh_to_grid_regridder.regrid(mesh_input)
# For a flat surface, we would expect the fractional part of these values
# to be either 1/3 or 2/3. Since the actual surface lies on a sphere, and
# due to the way ESMF calculates these values, the expected output is
# slightly different. It's worth noting that the finer the resolution, the
# closer these numbers are. Since the grids/meshes lie on coarse steps of
# about 10 degrees, we can expect most cases to behave more similarly to
# bilinear regridders on flat surfaces.
expected_grid_output = np.array([
[0.0, 2.0],
[0.6662902773937054, 2.6662902773105808],
[-1, 3.333709722689418],
])
expected_grid_mask = np.array([[0, 0], [0, 0], [1, 0]])
expected_grid_output = ma.array(expected_grid_output,
mask=expected_grid_mask)
assert ma.allclose(expected_grid_output, grid_output)
grid_to_mesh_regridder = Regridder(grid, node_mesh, method="bilinear")
grid_input = np.array([[0, 0], [1, 0], [2, 1]])
mesh_output = grid_to_mesh_regridder.regrid(grid_input)
expected_mesh_output = ma.array([0.0, 1.5, 0.0, 0.5, -1],
mask=[0, 0, 0, 0, 1])
assert ma.allclose(expected_mesh_output, mesh_output)
grid_to_face_mesh_regridder = Regridder(grid, face_mesh, method="bilinear")
grid_input_2 = np.array([[0, 0], [1, 0], [4, 1]])
face_mesh_output = grid_to_face_mesh_regridder.regrid(grid_input_2)
expected_face_mesh_output = np.array([0.0, 1.4888258584989558])
assert ma.allclose(expected_face_mesh_output, face_mesh_output)
def _give_extra_dims(array):
result = np.stack([array, array + 1])
result = np.stack([result, result + 10, result + 100])
return result
extra_dim_mesh_input = _give_extra_dims(mesh_input)
extra_dim_grid_output = mesh_to_grid_regridder.regrid(extra_dim_mesh_input)
extra_dim_expected_grid_output = _give_extra_dims(expected_grid_output)
assert ma.allclose(extra_dim_expected_grid_output, extra_dim_grid_output)
extra_dim_grid_input = _give_extra_dims(grid_input)
extra_dim_mesh_output = grid_to_mesh_regridder.regrid(extra_dim_grid_input)
extra_dim_expected_mesh_output = _give_extra_dims(expected_mesh_output)
assert ma.allclose(extra_dim_expected_mesh_output, extra_dim_mesh_output)