Rust atmosphere spectral transform kernels with Python bindings
What is spectralkernel_rs?
spectralkernel_rs provides Rust implementations of atmosphere-oriented spherical spectral transform kernels, with Python bindings built through PyO3 and maturin.
The project focuses on reusable low-level kernels and high-level spherical operators for workflows that need:
- scalar and vector spherical harmonic analysis/synthesis,
- gradients, divergence, vorticity, Laplacians, and inverse operators,
- streamfunction / velocity-potential transforms,
- Helmholtz-style vector decomposition,
- shallow-water and advection helper tendencies,
- Python-accessible NumPy array interfaces.
The Rust core is designed for performance-sensitive spectral computations while the Python package exposes a compact API for scientific workflows.
Installation
Install the Python package from PyPI:
pip install spectralkernel-rs
The import name is:
import spectralkernel_rs as sk
Quick start
import numpy as np
import spectralkernel_rs as sk
ops = sk.SphereOps.gaussian(9, 16, radius=1.0)
lat = np.deg2rad(ops.lat())
lon = np.deg2rad(ops.lon())
field = np.cos(lat)[:, None] * np.cos(lon)[None, :]
grad_u, grad_v = ops.grad(field)
lap = ops.laplacian(field)
recovered = ops.inverse_laplacian(lap)
print(grad_u.shape, grad_v.shape, recovered.shape)
Build instructions
Requirements
- Python >= 3.10
- NumPy >= 1.24
- xarray >= 2023.1.0
- Rust stable toolchain for local builds
- maturin for Python extension builds
- uv for the provided multi-version wheel build scripts
- Docker for the manylinux wheel build script
Develop locally
From the project root:
python -m pip install --upgrade pip maturin pytest
python -m maturin develop --release
python -m pytest -q tests/test_sphere_ops.py
Windows wheels
Install Rust and uv, then run:
.\scripts\build_manywindows_wheel.ps1
Generated wheels are written to dist/.
Linux wheels
Install Docker, then run on a Linux host:
bash ./scripts/build_manylinux_wheel.sh
Generated wheels are written to dist/.
macOS wheels
Install Rust and uv, then run on macOS:
bash ./scripts/build_macos_wheel.sh
Generated wheels are written to dist/.
Tests
Run the focused Python test used by CI:
python -m pytest -q tests/test_sphere_ops.py
The helper scripts use the active python from your shell:
.\scripts\run_test.ps1
./scripts/run_test.sh
Rust formatting and checks:
cargo fmt --all -- --check
cargo check --all-targets
Python API overview
The high-level Python API starts from SphereOps:
ops = sk.SphereOps.regular(nlat, nlon, radius=6.3712e6)
ops = sk.SphereOps.gaussian(nlat, nlon, radius=6.3712e6)
Common operations include:
scalar_to_spec,spec_to_scalarvector_to_spec,spec_to_vectorgrad,div,vortlaplacian,inverse_laplacianstreamfunction_to_windvelocity_potential_to_windstreamfunction_velocity_potentialhelmholtz_decomposespectral_filterhyperdiffusion,vector_hyperdiffusion
Module-level equation helpers include:
scalar_advection_rhsbarotropic_vorticity_rhsshallow_water_rhs
Rust crate
The crate is published as:
[dependencies]
spectralkernel_rs = "1"
The current Rust library primarily backs the Python extension and exposes the same spectral kernel implementation used by the Python package.
Reference
- Adams, J. C., & Swarztrauber, P. N. (1999). SPHEREPACK 3.0: A Model Development Facility. Monthly Weather Review, 127(8), 1872-1878. https://doi.org/10.1175/1520-0493(1999)127[1872:SAMDF](1872:SAMDF)2.0.CO;2
- https://github.com/NCAR/NCAR-Classic-Libraries-for-Geophysics
- https://github.com/jlokimlin/spherepack
License
This project is distributed under the BSD 3-Clause License. See LICENSE for details.
1 maintainer
Metadata
1 maintainer
Release files for spectralkernel-rs 1.0.1
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Built distributions (wheels)
Total release size: 21.0 MB
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| Download URL | spectralkernel_rs-1.0.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl |
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| Size | 1.2 MB |
| Tags | CPython 3.10 Linux glibc 2.17+ x86-64 |
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SHA-256 checksum How to use checksums |
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Transparency logRelease files / spectralkernel_rs-1.0.1-cp310-cp310-macosx_11_0_arm64.whl
| Download URL | spectralkernel_rs-1.0.1-cp310-cp310-macosx_11_0_arm64.whl |
|---|---|
| Size | 1.0 MB |
| Tags | CPython 3.10 macOS 11.0+ ARM64 |
|
SHA-256 checksum How to use checksums |
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