Publish dataset card and polygon statistics report

README.md

@@ -60,14 +60,14 @@ Source code: [GitHub repository](https://github.com/NoeFlandre/osm-polygon-wikid
 | Unique polygon identities (osm_type, osm_id) | 1,157,841 |
 | Polygons with successful non-empty text (unique OSM identities) | 650,663 |
 | Wikipedia + Wikivoyage documents | 2,206,563 |
-| Document words | 801,528,334 |
 | Wikipedia + Wikivoyage sections | 12,299,365 |
-| Sentence rows | Not generated for this dataset version |
 | Wikipedia + Wikivoyage languages | 351 |
 | Geographic regions | 375 |
 | Total Parquet size | 20.6 GB |
 
-Polygon rows preserve regional records; identity and text metrics count each `(osm_type, osm_id)` once. Text requires `fetch_status=ok` and non-empty `full_text`.
+Polygon rows preserve regional records. Identity metrics use one deterministic representative per `(osm_type, osm_id)`. Text requires `fetch_status=ok` and a trimmed non-empty `full_text`.
+
+Text volume: 801,528,334 document words. Sentence rows are not generated for this dataset version.
 
 Document words count full Wikipedia and Wikivoyage document text; section rows are excluded. Sentence rows include split and explicitly unsplit unsupported-language rows when sentence sidecars exist.
 
@@ -108,7 +108,8 @@ Counts use one deterministic representative per polygon identity and the same te
 
 ## Polygon area and geometry
 
-Complete area, histogram, geometry, extent, and per-source statistics: [`stats.json`](stats.json).
+Recorded polygon area: 179,051,037.7964 km² total; median 1,357.6 m².
+Complete area distribution, histogram, geometry, extent, and per-source statistics: [`stats.json`](stats.json).
 
 ## Schema
 
@@ -127,4 +128,4 @@ ds = load_dataset("parquet", data_files={"polygons": "hf://datasets/NoeFlandre/o
 
 ## Citation
 
-Cite the dataset using [`CITATION.cff`](CITATION.cff).
+Download the dataset citation metadata from [`CITATION.cff`](CITATION.cff).