1-byte KDP Format (DB_KDP)

Specific differential phase (KDP) is stored in a signed 8-bit number using a log scale. The KDP angles are multiplied by the wavelength in cm then scaled using a log scale separately for both signs. The minimum value is 0.25, and the maximum value is 150.0 deg*cm/km. KDP values are defined as the one-way differential effect of the intervening weather. The table below gives some examples:

KDP \times λ = minimum \times {[{\frac{minimum}{maximum}}^{}]}^{[\frac{N - 129}{126}]}

Here is the conversion equation for positive values (stored value above 128):

KDP \times λ = 0.25 \times [600] [\frac{N - 129}{126}]

Here is the conversion equation for negative values (stored value below 128):

KDP \times λ = 0.25 \times [600] [\frac{127 - N}{126}]


Value	Meaning KDP*L	KDP for 10 cm	KDP for 5 cm
0	No data available
1	-150.00 deg*cm/km	-15.00 deg/km	-30.00 deg/km
2	-142.58	-14.26	-28.51
127	-0.250	-0.025	-0.050
128	0.000	0.000	0.000
129	0.250	0.025	0.050
130	0.263	0.026	0.053
254	142.58	14.58	28.51
255	Area not scanned