The Key register Topography (Basisregistratie Topgrafie, BRT) consists of digital topographic files on different scale levels (scale: 1:10.000, 1:50.000, 1:100.000, 1:250.000, 1:500.000, and 1:1.000.000). The Netherlands Cadastre or Kadaster manages the BRT. This collection of topographic files is available as open data. This means that the Kadaster makes these data files available free of charge, and subject to minimal delivery conditions.