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Source provenance

This page explains where the code in this repository came from and which licence notices apply to it. In short: the Rust engine was extracted from the MIT-licensed ras-commander project, the Python extension came from ras-commander's rust/fast-hdf directory, and the pure-Rust HDF5 reader is a vendored, locally modified copy of an upstream MIT/Apache-2.0 project.

Engine (crates/ras-commander-rust)

The engine began as a native extraction of HDF, catalogue and mesh logic from gpt-cmdr/ras-commander (MIT). It was then developed privately by CLB Engineering Corporation until this public release. Porting preserved the MIT copyright notices and attribution of the extracted code. This repository does not claim authorship of upstream storage libraries or of algorithms inherited from ras-commander.

Python extension (python/)

The Python extension (ras_commander._fast_hdf) was previously maintained in ras-commander's rust/fast-hdf directory and moved here together with the engine. It now depends on the engine through a Cargo path dependency on ../crates/ras-commander-rust.

Vendored HDF5 reader (vendor/)

vendor/ contains a modified copy of the hdf5-reader and hdf5-core crates from roteiro-gis/netcdf-rust (MIT OR Apache-2.0, copyright Ian Norden), based on upstream commit 24ff6fcfcc79a35c30aa5d8cb3028ab4d9d00564. The base requires the local shared-message and filtered fixed-array width fixes to read the qualified HEC-RAS corpus. Generic reader changes are kept generic: no RAS-specific parsing is hidden in the reader.

  • LICENSE: MIT, copyright CLB Engineering Corporation. This covers the repository as a whole.
  • python/licenses/ras-commander-LICENSE.txt: MIT, copyright William M. Katzenmeyer. This is the original ras-commander notice and is retained for the code extracted from ras-commander.
  • vendor/LICENSE-MIT and vendor/LICENSE-APACHE: the upstream licences of the vendored reader, retained unchanged. The reader is redistributed under the MIT option.
  • THIRD-PARTY-NOTICES.md (repository root) and python/THIRD-PARTY-NOTICES.md are the generated dependency licence bundles for the engine and for the wheel.

Freestiler, used by the Python extension for vector tiles, is an external dependency; its own limitations are not changed here.

What is not committed

No extracted HDF model datasets, compiled binaries, credentials, Python environments or benchmark outputs belong in the repository. Test fixtures are small synthetic files or small excerpts of public HEC-RAS example projects and public FEMA/NOAA models, each with recorded hashes and provenance; unavailable and unsupported cases are explicit.

CLB Engineering Corporation  ·  LLM Forward Engineering
RAS Commander — Native Rust Engine is a free and open-source project maintained by CLB Engineering Corporation. For agencies and firms modernizing H&H workflows with LLM Forward approaches, contact CLB to partner with the engineers who wrote the automation.