xuepy
Xue (雪) weather bundles for Python: the decoder, and an experimental native encoder — the Xue Rust crate through PyO3.
A .xue file packs one variable of a global forecast run as quantized
single-byte planes with temporal residual prediction and per-plane Zstandard,
so a browser can animate a 240-hour run frame by frame. docs/format.md in the
repository is the normative specification. Since 2026-09-15 the service
publishes the same bundles as Zarr v3 stores (docs/zarr-profile.md) rather
than .xue files, which xarray reads without this package; the decoder here
still reads every .xue, and the encoder still writes one as the
intermediate the store is derived from.
Installing
pip install xuepy
Linux wheels are manylinux_2_39 (Ubuntu 24.04+, Debian 13+) and macOS is
arm64 only. There is no sdist: building from source needs GDAL, libclang and
cmake, and an unsupported platform is better served by a clear "no matching
distribution" than by a confusing build failure.
Decoding
Bundle is the same reader the browser runs through wasm, so a bundle that
decodes here decodes there. A plane comes back as the uint8 NumPy array of
quantized codes the shader would have uploaded to an R8 texture; the
metadata's quantization block turns it back into physical values.
import xue
bundle = xue.Bundle.open("tmp2m.xue")
plane = bundle.decode(variable_id=1, frame_offset=24) # uint8, width * height
codebook = bundle.metadata["variables"][0]["quantization"]
celsius = codebook["offset"] + plane * codebook["scale"]
bundle.frame_offsets, bundle.unit_seconds and bundle.metadata describe
the time axis and the grid. Reconstruction is checked against the CRC-32 the
encoder wrote, so a corrupt file raises rather than returning wrong numbers.
Encoding
Experimental, and held to the Python reference pipeline by byte-for-byte identical output on every source it supports — GFS, ECMWF, GFS surface flux, and the CMA radar mosaic.
report = xue.convert_bin(["data/raw/gfs.2026082006"], "out/", model="gfs")
A build writes one Zarr v3 store per bundle (out/tmp2m.zarr, …) by
default; container=True writes each bundle's .xue beside it, and
zarr=False, container=True the .xue alone (what earlier releases wrote
by default).
The stages are also exposed on their own — quantize, encode_residual,
decimate, encode_poster, write_store — taking and returning NumPy
arrays.
What is in the wheel
Its own minimal GDAL: the GRIB and netCDF drivers, the OpenJPEG codec the
GRIB driver needs for JPEG 2000-packed records (GFS-Wave), and nothing else,
with GDAL's and PROJ's data directories beside it, because the GRIB driver
cannot read a band without them. Eight shared libraries rather than the 227 a
distribution GDAL pulls in, all permissively licensed, with their notices in
xue/licenses/. Nothing needs to be installed alongside it and no environment
variable needs setting.
See docs/encoder.md
for how it is built and what it is measured against.
1 maintainer
Metadata
1 maintainer
Release files for xuepy 0.39.0
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Built distributions (wheels)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| xuepy-0.39.0-cp314-abi3-manylinux_2_39_x86_64.whl | CPython 3.14 | abi3 | Linux glibc 2.39+ x86-64 | Details |
| xuepy-0.39.0-cp314-abi3-manylinux_2_39_aarch64.whl | CPython 3.14 | abi3 | Linux glibc 2.39+ ARM64 | Details |
| xuepy-0.39.0-cp314-abi3-macosx_11_0_arm64.whl | CPython 3.14 | abi3 | macOS 11.0+ ARM64 | Details |
Total release size: 47.8 MB
Release files / xuepy-0.39.0-cp314-abi3-manylinux_2_39_x86_64.whl
| Download URL | xuepy-0.39.0-cp314-abi3-manylinux_2_39_x86_64.whl |
|---|---|
| Size | 17.9 MB |
| Tags | CPython 3.14 Linux glibc 2.39+ x86-64 abi3 |
|
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| Size | 16.8 MB |
| Tags | CPython 3.14 Linux glibc 2.39+ ARM64 abi3 |
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| Size | 13.1 MB |
| Tags | CPython 3.14 abi3 macOS 11.0+ ARM64 |
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