Add D-infinity flow length computation#1013
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brendancol merged 1 commit intomasterfrom Mar 16, 2026
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New flow_length_dinf() computes flow path lengths from D-inf angle grids using Tarboton's two-neighbor angle decomposition. Downstream mode gives the proportion-weighted distance to outlet; upstream mode gives the longest path from any divide. All four backends: NumPy, CuPy, Dask+NumPy, Dask+CuPy. 25 tests covering correctness, edge cases, and cross-backend consistency. Also adds the missing flow_accumulation_dinf entry to the README feature matrix.
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Summary
flow_length_dinf()function: proportion-weighted flow path lengths from D-inf angle gridsflow_accumulation_dinfentry in the README feature matrixAll three routing schemes (D8, D-inf, MFD) now have matching flow length functions.
Closes #1012
Test plan