# CODE TABLE 3.15, Physical meaning of vertical coordinate
# 0-19 Reserved
20 20 Temperature (K)
# 21-99 Reserved
100 100 Pressure (Pa)
101 101 Pressure deviation from mean sea level (Pa)
102 102 Altitude above mean sea level (m)
103 103 Height above ground (see Note 1) (m)
104 104 Sigma coordinate
105 105 Hybrid coordinate
106 106 Depth below land surface (m)
107 pt Potential temperature (theta) (K)
108 108 Pressure deviation from ground to level (Pa)
109 pv Potential vorticity (K m-2 kg-1 s-1)
110 110 Geometrical height (m)
111 111 Eta coordinate (see Note 2)
112 112 Geopotential height (gpm)
# 113-159 Reserved
160 160 Depth below sea level (m)
# 161-191 Reserved
# 192-254 Reserved for local use
255 255 Missing
# Notes:
# (1) Negative values associated to this coordinate will indicate depth below ground surface.  If values are all below surface, use of entry 106 is recommended, with positive coordinate values instead.
# (2) The Eta vertical coordinate system involves normalizing the pressure at some point on a specific level by the mean sea level pressure at that point.