Methodology

From source to map

• Source files or documented snapshots are pinned and checked.
• Codes, dates, measures and geography are normalized into a versioned catalogue.
• Quality checks reconcile coverage, totals, hierarchies and known exceptions before release.
• The browser loads only published catalogue assets; it does not silently replace them with a live third-party API response.

Geography and time

Every map slice names its boundary pack and valid geography. Municipality-to-district, province and region roll-ups use explicit reference relationships. Historical change is shown only when comparison rules allow it; otherwise the interface says that vintages are not directly comparable.

Measures and missing values

Counts may be summed only when the source measure and grouping are additive. Rates, shares, densities and per-capita measures are recomputed from valid components. Missing, suppressed and structurally unavailable values remain distinct and are never converted to zero.

Interpretation

A map is descriptive, not proof of causation. Definitions, population coverage, revisions and geographic changes can affect comparisons. Use the source and methodology shown for the selected slice before making decisions.