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Earth science
Any of several geological sciences that are concerned with the earth, its origins, and all of its various structures and physical forms and phenomena.
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Earth science > Mapping science 
available potential energy
Earth science; Mapping science
That portion of the total potential energy which can be converted to kinetic energy in an adiabatically enclosed system.
geometric elevation
Earth science; Mapping science
The quantity rH(r+H), in which r is the radius of the Earth at 45 o 32' 40" latitude and H is the dynamic height in dynamic meters.
ephemeris second
Earth science; Mapping science
The unit of time equal to 1/(31 556 925. 974 7) part of the tropical year for 1900 January 0 at 12 hours ephemeris time. This definition was adopted in 1960 by the general ...
engineer's level
Earth science; Mapping science
A leveling instrument whose telescope and level are connected rigidly to a vertical axle, so that the line of sight must be leveled using the screws in the base (or using the ...
mean equinox and equator
Earth science; Mapping science
The celestial reference system determined by ignoring small variations of short period in the motions of the celestial equator and ecliptic. Coordinates in stellar catalogs are ...
photographic emulsion
Earth science; Mapping science
A suspension of a light-sensitive salt of silver (especially silver chloride or silver bromide) in a colloidal medium (usually gelatin, which is placed as a coating on rigid or ...
precise ephemeris
Earth science; Mapping science
An ephemeris which contains coordinates and times (and possibly velocities) more precise than those of a broadcast ephemeris. The term has been used, in particular, to refer to ...
Sub-categories
- Geology (10953)
- Mapping science (105290)
- Oceanography (12332)
- Physical oceanography (42660)
- Remote sensing (8661)
- Seismology (14406)
- Soil science (29216)