region-dealias
Fast region-based Doppler velocity dealiasing — a Rust port of the core
(non-reference-anchored) path of Py-ART's
dealias_region_based, with Python bindings.
The goal is bit-identical output to pyart on the path the
NEXRAD Level 2 browser
uses (dealias_region_based(radar, vel_field="velocity", keep_original=False),
i.e. no ref_vel_field), but much faster — the slow part in pyart is the pure
Python _EdgeTracker network reduction, which is what Rust accelerates.
Install
pip install region-dealias # prebuilt manylinux / macOS wheels
Use
Drop-in replacement for pyart on a Radar object:
from region_dealias import dealias_region_based
corr = dealias_region_based(radar, vel_field="velocity", keep_original=False)
radar.add_field("corrected_velocity", corr)
Low-level, one sweep at a time (array in / fold-count out):
import numpy as np
from region_dealias import sweep_folds
folds = sweep_folds(vel, mask, nyquist=25.0, rays_wrap_around=True)
dealiased = vel + folds * (2 * 25.0)
vel is (nrays, ngates) float32, mask is a bool array (True = excluded:
masked or non-finite). folds is the integer number of Nyquist intervals to
add at each gate.
Scope
Implemented: the per-sweep region-network algorithm
(interval_splits, skip_between_rays, skip_along_ray, centered,
rays_wrap_around, per-sweep nyquist_vel).
Not implemented (the high-level wrapper raises NotImplementedError so
callers can fall back to pyart): ref_vel_field (sounding-anchored) unfolding,
custom gatefilter, and explicit interval_limits.
Parity
tests/test_parity.py checks the Rust folds against a verbatim transcription of
pyart's algorithm (tests/pyart_ref.py) on hundreds of randomized synthetic
aliased sweeps plus edge cases, asserting exact integer equality. CI also checks
against the installed arm_pyart package. The certified pyart version is
recorded in CI; re-verify on pyart upgrades.
Identity relies on faithfully reproducing: scipy.ndimage.label numbering
(4-connectivity, first-encounter raster order), the Cython edge-finder
traversal order, the float32/float64 dtype chain, NumPy banker's rounding
(round_ties_even), and argmax-first-tie selection.
Layout
crates/core # pure-Rust algorithm
crates/py # PyO3 bindings (maturin)
python/ # region_dealias package (low-level + radar-compat wrapper)
tests/ # parity harness
License
MIT
1 maintainer
Metadata
1 maintainer
Release files for region-dealias 0.1.0
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