hydro: validate cellsize before division#1430
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brendancol merged 1 commit intomainfrom May 4, 2026
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twi_d8, flow_direction_d8/_dinf/_mfd, and flow_length_d8/_dinf/_mfd all call get_dataarray_resolution() and divide by the result without checking that the cellsize is finite and non-zero. A 1-D-coord DataArray (or one with NaN coords) silently produced inf or zero output. Add a finite-and-non-zero check at each of the seven call sites that raises ValueError with a message naming the cellsize values. 7 new tests in test_validate_cellsize.py covering each function.
brendancol
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May 3, 2026
Records the 11 PRs filed this round: - hydro: HIGH flow_direction_mfd memory guard (PR #1424); MEDIUM bundles for _validate_raster on secondary args (#1426), scalar param validation (#1428), and cellsize validation (#1430). - reproject: MEDIUM bundles for _validate_raster (#1432), grid/bounds/ precision validation (#1434), and NaN/Inf rejection (#1436). - flood: mannings_n DataArray validation (#1438). - pathfinding: waypoint cap + _validate_raster (#1440). - polygonize: _validate_raster (#1442). - terrain: scratch memory guard + scalar validation (#1444).
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Closes #1429.
Summary
cellsize_x/cellsize_yafter everyget_dataarray_resolution()call inxrspatial/hydro/.twi_d8,flow_direction_d8/_dinf/_mfd,flow_length_d8/_dinf/_mfd.ValueError.Test plan
pytest xrspatial/hydro/tests/test_validate_cellsize.py— 7 new passes.pytest xrspatial/hydro/tests/— 774 + 7 = 781 passed.