Structure Grid​Constants public struct GridConstants Grid Constants Properties MIN_LON public static let MIN_LON = -SF_WGS84_HALF_WORLD_LON_WIDTH Minimum longitude MAX_LON public static let MAX_LON = SF_WGS84_HALF_WORLD_LON_WIDTH Maximum longitude MIN_LAT public static let MIN_LAT = -SF_WGS84_HALF_WORLD_LAT_HEIGHT Minimum latitude MAX_LAT public static let MAX_LAT = SF_WGS84_HALF_WORLD_LAT_HEIGHT Maximum latitude BAND_LETTER_OMIT_I public static let BAND_LETTER_OMIT_I: Character = "I" Omitted band letter 'I' BAND_LETTER_OMIT_O public static let BAND_LETTER_OMIT_O: Character = "O" Omitted band letter 'O' MAX_MAP_ZOOM_LEVEL public static let MAX_MAP_ZOOM_LEVEL = 21 Max map zoom level NORTH_CHAR public static let NORTH_CHAR = "N" North single character as a string SOUTH_CHAR public static let SOUTH_CHAR = "S" South single character as a string WEST_CHAR public static let WEST_CHAR = "W" West single character as a string EAST_CHAR public static let EAST_CHAR = "E" East single character as a string MERCATOR_RADIUS public static let MERCATOR_RADIUS = 85445659.44705395 Mercator radius