From d80714c8f9a76f7593f2b2f94bcf66773523c08a Mon Sep 17 00:00:00 2001
From: Ryan May <rmay31@gmail.com>
Date: Fri, 4 Mar 2016 16:23:17 -0700
Subject: [PATCH 1/2] Add Bz symbol for reflectivity (to support "dBz")

This makes things consistent with units argued in the paper here:
http://dx.doi.org/10.1175/2009JTECHA1360.1

Also make the captitalization of the unit consistent within the description.
(The D should never be capitalized.)
---
 lib/udunits2-common.xml | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/udunits2-common.xml b/lib/udunits2-common.xml
index e992b85..af5ca65 100644
--- a/lib/udunits2-common.xml
+++ b/lib/udunits2-common.xml
@@ -885,10 +885,14 @@ elements appear only within <aliases>.
             </aliases>
             <definition>unit of volume for liquid measure in the Imperial system, equal to 1/160 liquid gallon</definition>
         </unit>
+        <!-- See http://dx.doi.org/10.1175/2009JTECHA1360.1 for more information on proper spelling of dBz -->
         <unit>
             <def>lg(re (1e-6 m)^3)</def>
-            <aliases> <symbol>BZ</symbol> </aliases>
-            <definition>logarithmic unit used to compare the reflectivity (Z) of an unknown remote object, to the reflective return created by a droplet of rain with a diameter of 1 mm; is the base unit for "dBz", which is the typical logarithmic unit for measuring atmospheric radar reflectivity; a value of 0 Bz (0 DBz) corresponds to the return from a single cubic micron; a value of 6 Bz (60 DBz) corresponds to extremely heavy rain.</definition>
+            <aliases>
+                <symbol>BZ</symbol>
+                <symbol>Bz</symbol>
+            </aliases>
+            <definition>logarithmic unit used to compare the reflectivity (Z) of an unknown remote object, to the reflective return created by a rain with a density of a single drop with a diameter of 1 mm in every 1 m^3 of air; is the base unit for "dBz", which is the typical logarithmic unit for measuring atmospheric radar reflectivity; a value of 0 Bz (0 dBz) corresponds to the return from a single cubic micron; a value of 6 Bz (60 dBz) corresponds to extremely heavy rain.</definition>
         </unit>
 
     <!-- Time -->

From 97944a59ee019689fca74de45d7166ad000d8680 Mon Sep 17 00:00:00 2001
From: Ryan May <rmay31@gmail.com>
Date: Fri, 4 Mar 2016 16:37:48 -0700
Subject: [PATCH 2/2] Add unit definition for dB.

---
 lib/udunits2-common.xml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/udunits2-common.xml b/lib/udunits2-common.xml
index af5ca65..df3090d 100644
--- a/lib/udunits2-common.xml
+++ b/lib/udunits2-common.xml
@@ -164,6 +164,11 @@ elements appear only within <aliases>.
             </aliases>
             <definition>parts per quadrillion</definition>
         </unit>
+        <unit>
+            <def>lg(re 1)</def>
+            <aliases> <symbol>B</symbol> </aliases>
+            <definition>logarithmic unit used to express dimensionless ratios; a value of 0 B (0 dB) corresponds to a ratio of 1</definition>
+        </unit>
 
     <!-- Plane Angle -->
         <unit>