Notation	Name	Description	Status
1	Ground or water surface	Ground or water surface	stable
2	Cloud base level	Cloud base level	stable
3	Level of cloud tops	Level of cloud tops	stable
4	Level of 0°C isotherm	Level of 0°C isotherm	stable
5	Level of adiabatic condensation lifted from the surface	Level of adiabatic condensation lifted from the surface	stable
6	Maximum wind level	Maximum wind level	stable
7	Tropopause	Tropopause	stable
8	Nominal top of the atmosphere	Nominal top of the atmosphere	stable
9	Sea bottom	Sea bottom	stable
10	Entire atmosphere	Entire atmosphere	stable
11	Cumulonimbus (CB) base	Cumulonimbus (CB) base	stable
12	Cumulonimbus (CB) top	Cumulonimbus (CB) top	stable
20	Isothermal level	Isothermal level	stable
100	Isobaric surface	Isobaric surface	stable
101	Mean sea level	Mean sea level	stable
102	Specific altitude above mean sea level	Specific altitude above mean sea level	stable
103	Specified height level above ground	Specified height level above ground	stable
104	Sigma level	Sigma level	stable
105	Hybrid level	Hybrid level	stable
106	Depth below land surface	Depth below land surface	stable
107	Isentropic (theta) level	Isentropic (theta) level	stable
108	Level at specified pressure difference from ground to level	Level at specified pressure difference from ground to level	stable
109	Potential vorticity surface	Potential vorticity surface	stable
111	Eta level	Eta level	stable
113	Logarithmic hybrid level	Logarithmic hybrid level	stable
114	Snow level	Snow level	stable
117	Mixed layer depth	Mixed layer depth	stable
118	Hybrid height level	Hybrid height level	stable
119	Hybrid pressure level	Hybrid pressure level	stable
150	Generalized vertical height coordinate	Generalized vertical height coordinate	stable
160	Depth below sea level	Depth below sea level	stable
161	Depth below water surface	Depth below water surface	stable
162	Lake or river bottom	Lake or river bottom	stable
163	Bottom of sediment layer	Bottom of sediment layer	stable
164	Bottom of thermally active sediment layer	Bottom of thermally active sediment layer	stable
165	Bottom of sediment layer penetrated by thermal wave	Bottom of sediment layer penetrated by thermal wave	stable
166	Mixing layer	Mixing layer	stable
167	Bottom of root zone	Bottom of root zone	stable
255	Missing	Missing	stable