Imports github.com/engelsjk/arcgis2geojson github.com/paulmach/orb github.com/paulmach/orb/geojson github.com/paulmach/orb/maptile github.com/paulmach/orb/maptile/tilecover Standard library imports encoding/json fmt io/ioutil net/http net/http/httputil net/url os path path/filepath sort strconv strings time