Large Array Initialization to 0

Is there a way to initialize a two dimensional array without giving all the values one by one.

I have signal declaration like :

  type t_id_data is array (integer range <> ) of integer; 
  type t_image_data is array (integer range <>) of t_id_data;
  signal s_image_data : t_image_data ( 0 to 30) (0 to 720);

I want to initialize this to 0. It is an integer array.

Thanks,