text: export const EARTH_RADIUS = 6378137.0
  
  export const KEYS = {
    LEFT: 37,
    UP: 38,
    RIGHT: 39,
    BOTTOM: 40
  }
  export const CONTROL_STATE = {
    NONE: -1,
    ROTATE: 0,
    DOLLY: 1,
    PAN: 2,
    TOUCH_ROTATE: 3,
    TOUCH_DOLLY_PAN: 4
  }
  export const EPS = 0.000001
  