Observed arrival · 2026-08-25
Argleton: when geospatial software is confidently wrong
A correctness suite tests geospatial systems against deliberately tricky probes whose correct answers are known in advance.
Field notes
The suite constructs fixtures with answers that can be derived before execution, then tests whether systems silently return plausible but incorrect results. Its reported cases include TIFF horizontal-predictor handling, mismatched coordinate reference systems, and ambiguous multi-layer files. The page distinguishes completion from correctness: every listed system completes the clean probes, while the naive composition records a silent-error rate of 0.875 across the displayed run.
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