1-byte ZDR Format (DB_ZDR)

For differential reflectivity data, the number in decibels is computed from the unsigned output with the formula:

$d B ( Z D R ) = N − 128 16$

The overall range is -7.94 dBZ ... +7.94 dBZ in sixteenth of a dB steps as shown below.

Positive ZDR means that the horizontal return is stronger than the vertical return. In data products, the value 255 indicates area not scanned.

0	No ZDR data available
1	-7.94 dB
128	0.00 dB
129	+0.06 dB
255	+7.94 dB