+ :url => "https://osmdata.openstreetmap.de/download/land-polygons-split-3857.zip",
+ :refresh => true
+ },
+ :water_polygons => {
+ :url => "https://osmdata.openstreetmap.de/download/water-polygons-split-3857.zip",
+ :refresh => true
+ },
+ :antarctica_icesheet_polygons => {
+ :url => "https://osmdata.openstreetmap.de/download/antarctica-icesheet-polygons-3857.zip",
+ :refresh => true
+ },
+ :antarctica_icesheet_outlines => {
+ :url => "https://osmdata.openstreetmap.de/download/antarctica-icesheet-outlines-3857.zip",
+ :refresh => true