Update README.md

README.md

@@ -15,6 +15,9 @@ https://github.com/microsoft/GlobalMLBuildingFootprints
 ## Notes
 The code downloads files for European countries and US, transforms them into geojson with right CRS, and then loads them into a DB.
 
+Not used here:
+https://sites.research.google/open-buildings/
+
 ---
 ### Authors
 Riccardo Boero - ribo@nilu.no