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Add example for regridding to arbitrary lat lon #16

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Oct 7, 2024
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43 changes: 43 additions & 0 deletions examples/regrid_to_given_lat_lon.py
Original file line number Diff line number Diff line change
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# SPDX-FileCopyrightText: Copyright (c) 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import numpy as np
import torch

import earth2grid

device = "cuda"


# the source grid (from 90N to 90S and 0E to 360E)
ll = earth2grid.latlon.equiangular_lat_lon_grid(721, 1440)

# a 2d grid of target lat lons
target_lat = np.linspace(30, 50, 32)
target_lon = np.linspace(100, 120, 64)
target_lat, target_lon = np.meshgrid(target_lat, target_lon)

# Some source data on the original grid
data = torch.ones([721, 1440]).to(device)

# Create a bilinear regridding object earth2grid
regrid = ll.get_bilinear_regridder_to(target_lat, target_lon)

# need to move the weights to same device and dtype as data
regrid.to(data)

# perform the regridding
out = regrid(data)
assert out.shape == target_lat.shape # noqa
print("data shape", out.shape)
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