I need to calculate green spaces in the metropolitan area for 155 cities around the world in QGIS.
Greenery would include everything from parks, trees, playgrounds, golf, vineyards, etc. Any advice where to start?
I have found a shapefile from NYU for metropolitan areas and now looking for each city under their departments, but already see an issue with that.
I wanted to do data scraping from OSM maps (it would be not all including). Also tried iTree even for approximate results but there were cities with missing or unclear satellite images.