Notation	Name	Description	Status
GEO	Geostationary orbit range	Altitude range of geostationary orbiting (GEO) objects, 35'78...	stable
L1	Lagrangian point L1	The L1 point lies on the line defined by the Sun and Earth, a...	stable
L4L5	Lagrangian points L4, L5	The L4 and L5 points lie at the third corners of the two equi...	stable
LEO	Low Earth orbit altitude range	Altitude range of low Earth orbiting (LEO) objects with an al...	stable
MEO	Medium Earth orbit altitude range	Altitude range of medium Earth orbiting (MEO) objects above l...	stable
MUS	Middle and upper stratosphere	Middle and upper stratosphere (ca. 25 - 47 km altitude)	stable
PBL	Planetary boundary layer	Bottom layer of the troposphere, also called atmospheric boun...	stable
SBL	Surface boundary layer	Layer of air tens of meters thick adjacent to the ground wher...	stable
TOA	Top of atmosphere	Top of atmosphere (ca. 100 km altitude)	stable
UTLS	Upper troposphere / lower stratosphere	Upper troposphere / lower stratosphere range (ca. 9 - 17 km a...	stable
bulkLayer	Bulk layer	Also called ocean sub-surface or bulk surface, the ocean bulk...	stable
cloudTop	Cloud top	For a given cloud or cloud layer, the highest level in the at...	stable
deepOcean	Deep ocean	Lower part of the ocean below the thermocline (below ca. 1'00...	stable
deepSoil	Deep soil layer	Lower levels of the soil, below the soil root zone and above ...	stable
earthInterior	Interior earth	Sub-surface of the Earth, including the crust, mantle and cor...	stable
freeTroposphere	Free troposphere	Atmosphere above the planetary boundary layer, in which the e...	stable
heliosphere	Heliosphere	Vast, bubble-like region of space which surrounds and is crea...	stable
highThermosphere	High thermosphere	High thermosphere (ca. 200 km to 500 km altitude)	stable
ionosphere	Ionosphere	Atmospheric region containing significant concentrations of i...	stable
landSurface	Land surface	Surface of the land masses, the lower part of the atmosphere-...	stable
lowThermosphere	Low thermosphere	Low thermosphere (ca. 100 km to 200 km altitude)	stable
magnetosphere	Magnetosphere	Region in which dynamical motions are strongly influenced, or...	stable
mesosphere	Mesosphere	Mesosphere (ca. 47 - 85 km altitude) (https://www.eoas.ubc.ca...	stable
rootRegion	Root region of the soil	Upper levels of the soil, where biological activity takes pla...	stable
seaSurface	Sea surface	Surface of the ocean, characterized by a cool skin layer (a f...	stable
sun	Solar surface and atmosphere	Surface of the Sun and layers above it, including the photosp...	stable
totalAtmosphere	Total atmospheric column	Vertical range above Earth (ca. 0 - 1'000 km altitude)	stable
troposphere	Troposphere	Troposphere (ca. 0 - 11 km altitude) (https://www.eoas.ubc.ca...	stable
upperOcean	Upper ocean	Upper part of the ocean including the thermocline (ca. 0 - 1'...	stable