Publish dataset card and polygon statistics report

README.md

@@ -119,8 +119,10 @@ Each H3 cell contains the raw number of polygons with non-empty Wikipedia or Wik
 
 | Metric | Value |
 | --- | ---: |
-| Polygons | 1,184,110 |
+| Polygon rows across regional extracts | 1,184,110 |
 | Unique Wikidata entities | 1,119,223 |
+| Unique polygon identities (osm_type, osm_id) | 1,157,841 |
+| Polygons with successful non-empty text (unique OSM identities) | 650,663 |
 | Wikipedia polygon-document links | 2,468,604 |
 | Wikipedia + Wikivoyage languages | 351 |
 | Geographic regions | 375 |
@@ -133,6 +135,8 @@ Each H3 cell contains the raw number of polygons with non-empty Wikipedia or Wik
 | Wikipedia + Wikivoyage document words | 801,528,334 |
 | Total Parquet size | 19.2 GB |
 
+Polygon rows retain regional copies. Identity metrics use one deterministic representative per `(osm_type, osm_id)`; successful text additionally requires `fetch_status=ok` and trimmed non-empty `full_text`.
+
 Wikipedia + Wikivoyage document words sums the full Wikipedia and Wikivoyage documents and excludes section rows because sections duplicate document text.
 
 ## Polygon surface and geometry
@@ -206,7 +210,8 @@ Recomputed from every row of the published `polygons/*.parquet` table before eac
 - A vertex is one coordinate pair; each ring's repeated closing coordinate is counted once. A hole is an inner ring, and `Components` is the number of `MultiPolygon` members, which is `1` for every `Polygon` row.
 - Metre spans convert the degree spans with the same equirectangular rule used for `area_m2`, evaluated at each bounding box's mean latitude.
 - `Bbox wider than 180 degrees` is the antimeridian signature: the box spans more than half the globe because the polygon crosses longitude 180.
-- Area buckets are half-open decade intervals [lower, upper) in square metres; the bucket list is identical in every report so two reports stay comparable.
+- Area buckets are half-open decade intervals `[lower, upper)` in square metres; the bucket list is identical in every report so two reports stay comparable.
+
 ## Language distribution
 
 Top 20 languages across Wikipedia and Wikivoyage documents: