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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 
octal digit
Earth science; Mapping science
A digit which is a member of the set of eight digits 0,1,2,3,4,5,6,7 used in the number system having the radix 8.
magnetic direction
Earth science; Mapping science
Horizontal direction expressed as an angle from magnetic north.
electrical distance
Earth science; Mapping science
Length measured in terms of the distance traveled by radio waves in unit time.
direction
Earth science; Mapping science
(1) In surveying and mapping, the angle between a line or plane and an arbitrarily chosen reference line or plane. At a triangulation station, observed horizontal angles are ...
diffraction
Earth science; Mapping science
The bending of waves, electromagnetic or sound, when the waves meet an opaque obstacle. The waves are bent inwards producing vibrations in what would otherwise be a shadowed ...
approach-zone district
Earth science; Mapping science
All that region outward from the end of a runway in which the heights of structures or other hazards to aircraft are restricted. The slopes and dimensions are usually fixed by ...
diluvion
Earth science; Mapping science
The gradual and imperceptible washing-away and resultant loss of soil along a watercourse. The opposite of alluvion. Note that this definition implies that alluvion is a ...
Sub-categories
- Geology (10953)
- Mapping science (105290)
- Oceanography (12332)
- Physical oceanography (42660)
- Remote sensing (8661)
- Seismology (14406)
- Soil science (29216)