def __init__(self, md, tile_manager, levels, refresh_timestamp, coverage):
    self.md = md
    self.tile_manager = tile_manager
    self.grid = tile_manager.grid
    self.levels = levels
    self.refresh_timestamp = refresh_timestamp
    self.coverage = coverage
def __init__(self, md, tile_manager, levels, refresh_timestamp, coverage):
    self.md = md
    self.tile_manager = tile_manager
    self.grid = tile_manager.grid
    self.levels = levels
    self.refresh_timestamp = refresh_timestamp
    self.coverage = coverage