45 lines
2.5 KiB
Markdown
45 lines
2.5 KiB
Markdown
# DA/EN source disagreement audit
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The detailed field-level report is `data/reports/source-disagreements.parquet`. It compares the
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202,393 shared `object_number` identities while isolating 305 duplicate identity groups that first
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need duplicate resolution.
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## Findings
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For comparable singleton records:
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- `rights`: 50,425 differences, all the same localization pair: DA
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`https://www.smk.dk/section/brug-af-museets-materiale/` versus EN
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`https://www.smk.dk/en/section/use-of-smk-material/`;
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- normalized dimensions: 156 differences;
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- `has_image`: 7 differences;
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- image width and height: 15 differences each (8 unequal, 5 missing in DA, 2 missing in EN);
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- IIIF image IDs/info: 11 differences each (3 unequal, 6 missing in DA, 2 missing in EN);
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- image thumbnail/native URLs: 15 differences each.
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There were no comparable-singleton disagreements in `public_domain`, `colors`, brightness,
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contrast, saturation, entropy or colortemp. Palette ordering therefore also agrees across the
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language snapshots wherever both contain a comparable singleton record.
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The image differences are not merely localization. Examples include `KKS1984-179` (2048×3072 DA
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versus 5078×6618 EN with different IIIF IDs) and `KKSgb5300` (8180×5262 DA versus 999×643 EN).
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The seven `has_image` disagreements go in both directions. Dimension differences include both
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small numeric conflicts (`DEP977`) and measurements present in only one language.
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## Source precedence recommendation
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- Identity: match cross-language rows by SMK `id` where available and verify `object_number`; do
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not use array position.
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- Localized text: retain DA and EN independently with their explicit source language.
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- `rights`: preserve both URLs, but map this exact localized pair to one policy concept. Use
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`public_domain` plus the original rights URL for legal provenance.
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- Palette and visual values: accept the shared value when equal. If a future snapshot disagrees,
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flag it rather than apply global language precedence.
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- Image metadata: choose a coherent image bundle (IIIF ID, width, height and URLs) at row level.
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Prefer the bundle that is internally complete and consistent; if both differ and are complete,
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retain both and require freshness/content verification. Never mix dimensions from one bundle
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with an image ID from the other.
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- Dimensions: compare localized canonical tuples, preserve both originals, and leave conflicting
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canonical values unresolved unless an explicit part-aware rule decides them.
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- Missing one language: retain the available source value with provenance.
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