def altitude_mode=(mode)
      allowed_modes = %w(clampToGround relativeToGround absolute)
      if allowed_modes.include?(mode)
        @altitude_mode = mode
      else
        raise ArgumentError, "Must be one of the allowed altitude modes: #{allowed_modes.join(',')}"
      end
    end
def altitude_mode=(mode)
      allowed_modes = %w(clampToGround relativeToGround absolute)
      if allowed_modes.include?(mode)
        @altitude_mode = mode
      else
        raise ArgumentError, "Must be one of the allowed altitude modes: #{allowed_modes.join(',')}"
      end
    end
Set the altitude mode