Met Collection Explorer methodology
How Met Collection Explorer selects, normalizes, and presents public museum-object records without treating creation dates as feed activity.
Inputs and coverage
Met Collection Explorer uses the public Collection API maintained by The Metropolitan Museum of Art. A bounded search request returns object identifiers, and bounded detail requests retrieve the museum's title, object-date label, begin and end years, artist attribution, culture, medium, object type, department, public-domain flag, image reference, and official record URL. The public table is a selected API snapshot, not a claim to reproduce the museum's complete collection. Missing fields remain visibly unavailable rather than being filled from another provider or inferred from an object identifier.
Normalization
The museum's objectDate text is preserved because it can express ranges, approximate dates, eras, and revisions more accurately than one artificial timestamp. Numeric objectBeginDate and objectEndDate values are retained as integer years for bounded calculations, with zero treated as unavailable and negative values retained as BCE years. They are never passed to JavaScript as Unix milliseconds. Object identifiers remain identifiers and are never treated as measurements. The API does not provide a dependable per-object modification timestamp, so Art Report does not relabel an artwork's creation date as feed recency or upstream freshness.
Art Report value-add
Art Report groups records by the museum-supplied department, calculates only a non-negative date-span length when both boundary years are valid, and translates the supplied public-domain and image fields into plain availability labels. These transformations help readers scan the table; they do not measure quality, importance, popularity, market value, or recent activity. The explorer intentionally omits change status, recency days, trend claims, and significance scores because the source fields do not support those conclusions. Artist and culture fields remain separate so one is not silently substituted for the other.
Refresh, validation, and corrections
Each run uses the declared request ceiling and preserves the previous active snapshot if fetching, normalization, semantic validation, or publication checks fail. Before staging, the importer rejects the legacy numeric-measurement shape, requires a usable museum date representation, and verifies derived numeric fields are finite. The publication gate repeats those semantic checks against selected records so an older corrupt snapshot cannot be promoted. Source-contract changes invalidate earlier qualification receipts. After requalification, a new snapshot and static artifact are promoted atomically, preserving the prior snapshot and artifact for rollback. Source corrections may change historic labels or availability on later monthly runs.