2-byte Rainfall Rate Format (DB_RAINRATE2)

Rainfall rates are stored in 16-bit floating-point representation of a 27-bit integer in units of 0.0001 mm/hr.

The floating-point number consists of a 4-bit exponent in the high four bits, followed by a 12-bit mantissa. It uses implied digits and soft underflow. If the exponent is 0, the mantissa consists of the value.

If the exponent is 1 ... 15, the 12-bit mantissa has a 1 prefixed to it, making it a 13-bit mantissa. This 13-bit mantissa is shifted up by one less than the exponent.

The following table gives some examples.