Section 3 - Code Table 15 : Physical meaning of vertical coordinate

Code Tables for Section 3

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Code Meaning
20 Temperature (K)
100 Pressure (Pa)
101 Pressure deviation from mean sea level (Pa)
102 Altitude above mean sea level (m)
103 Height above ground (m)
104 Sigma coordinate
105 Hybrid coordinate
106 Depth below land surface (m)
107 Potential temperature (theta) (K)
108 Pressure deviation from ground to level (Pa)
109 Potential vorticity (K m-2 kg-1 s-1)
110 Geometrical height (m)
111 Eta coordinate
112 Geopotential height (gpm)
113 Logarithmic hybrid coordinate
160 Depth below sea level (m)
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.