isobenefit

The Rust simulation core for the Isobenefit Urbanism QGIS plugin.

It is a pure compute engine: arrays in, arrays out. It never imports QGIS or performs any GIS IO — the plugin handles reading layers, reprojection, rasterization and writing rasters, then hands plain numpy arrays to this core.

Layout

  • src/neighbours.rs — neighbour iteration, contiguity counting, green-span checks
  • src/access.rs — heap-based bounded Dijkstra accessibility (parallel map-reduce)
  • src/density.rs — deterministic per-work-item RNG + density draws
  • src/sim.rs — the Simulation state machine and run_ensemble
  • src/lib.rs / src/py_bindings.rs — PyO3 bindings (built only with --features python)

Development

cargo test                 # pure-Rust algorithm tests (no Python needed)
maturin develop --release  # build + install the extension into the active venv
pytest tests_py            # Python-level golden + property tests

Parallelism (rayon) and determinism are first-class: results are independent of thread count. Reproducibility comes from per-work-item seeding (ChaCha8Rng derived from (seed, work_id)) and order-independent integer-sum reductions in the accessibility kernels.

Licensed under AGPL-3.0-or-later.

Project links

Data verified by PyPI on Jul 13, 2026
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Key dates

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  • Released:
Newer release available (0.17.1)

1 maintainer

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Avatar for shongololo from gravatar.com shongololo

Credits

Author: Gareth Simons

GitHub Statistics

Data verified by PyPI on Jul 13, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License

GNU Affero General Public License v3 or later (AGPLv3+) (AGPL-3.0-or-later)

Requires

Python >=3.9

Classifiers

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0.17.1

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0.17.0

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0.16.0

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0.15.0

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0.14.0

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0.13.0

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0.12.14

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0.12.13

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0.12.11

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This release

0.12.10 This release

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0.12.9

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0.12.7

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0.12.6

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0.12.4

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0.12.3

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0.12.1

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0.11.0

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0.10.0

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0.9.0

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0.8.0

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0.7.0

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0.6.0

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0.2.0

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0.1.0

4 files

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