opt/marble/share/marble/data/maps/earth/plain
opt/marble/share/marble/data/maps/earth/precip-dec
opt/marble/share/marble/data/maps/earth/precip-july
+opt/marble/share/marble/data/maps/earth/public-transport
opt/marble/share/marble/data/maps/earth/schagen1689
opt/marble/share/marble/data/maps/earth/srtm
opt/marble/share/marble/data/maps/earth/temp-dec