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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 
vertical angulation
Earth science; Mapping science
The process of obtaining differences of elevation by means of observed vertical angles together with lengths of lines. In geodesy, vertical angulation is called trigonometric ...
balancing sights
Earth science; Mapping science
Making observations, in leveling, in such a way that distances to the two leveling rods are approximately equal. Also referred to as balancing lines of sight and balancing ...
subtense bar
Earth science; Mapping science
A horizontally held bar carrying two easily visible marks a fixed, known distance apart, and used for determining the distance from an observer to the bar by means of the angle ...
astronomic
Earth science; Mapping science
Of, or pertaining to, astronomy. It is completely equivalent to the form astronomical. Although Merriam-Webster (2nd edition) gives precedence to astronomical, it is the ...
aposphere
Earth science; Mapping science
A surface of rotation whose meridional section is defined by the equation r = a sech(b ( Ψ + c)), where a, b and c are constants, Ψ is the isometric latitude and r is the ...
age of the moon
Earth science; Mapping science
The time elapsed since the preceding new moon. It is usually expressed in days.
absorption of light
Earth science; Mapping science
The reduction in the intensity of light, on passing through a medium, because the light is transformed by the medium into some other, invisible form of energy such as heat. It ...
Sub-categories
- Geology (10953)
- Mapping science (105290)
- Oceanography (12332)
- Physical oceanography (42660)
- Remote sensing (8661)
- Seismology (14406)
- Soil science (29216)