Year;"Source of data";"Area of grassland (m2)" 1783;"First Military Survey Map";118273 1861;"Second Military Survey Map";153079 1873;"Cadastre Maps of Buda";214520 1882;"Third Military Survey Map";213585 1923;"Renewed Third Military Survey Map";206760 1955;"Aerial photograph of the Military History Map Archives";165728 1959;"Renwed Gauss-Krüger projection map";127045 1978;"Aerial photograph of the Military History Map Archives";108172 1987;"Aerial photograph of the Military History Map Archives";106315 2004;"Google Earth satellite image";81366 2016;"Google Earth satellite image";67773