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