Update README.md

README.md

@@ -55,7 +55,30 @@ df.to_parquet('geonames_23_03_2025.parquet')
 
 ## Quality 
 
-Be warned, the quality - especially for other languages than English - might sometimes be low. Sometimes there are duplicates and very confusing entries.
+1. Be warned, the quality - especially for other languages than English - might sometimes be low. Sometimes there are duplicates and very confusing entries.
+2. There are obvious misses that could be cleaned with very simple processing. Example: filtering by country code germany, there is a point in Ukraine and France:
+
+```python
+import duckdb
+import geopandas
+from lonboard import viz
+df = duckdb.sql(f"SELECT * FROM 'https://huggingface.co/datasets/do-me/Geonames/resolve/main/geonames_23_03_2025.parquet?download=true' WHERE \"8\" = 'DE'  ").df() # you can add the country code to the query with AND \"8\" = 'GB'
+gdf = geopandas.GeoDataFrame(    df,    geometry=geopandas.points_from_xy(x=df["5"], y=df["4"]))
+gdf = gdf[~gdf.duplicated('1', keep=False)]
+viz(
+    gdf,
+    scatterplot_kwargs={
+        "get_radius": 5,            # radius value
+        "radius_units": "pixels",   # use screen pixels instead of meters
+        "pickable": True,           # ensure layer responds to pointer events
+    },
+    map_kwargs={
+        "show_tooltip": True,       # render tooltip on hover
+    },
+)
+```
+
+![image](https://cdn-uploads.huggingface.co/production/uploads/64c4da8719565937fb268b32/VUDtN4xhlRGANIajEABbL.png)
 
 ## Query with DuckDB