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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 
solar attachment
Earth science; Mapping science
A device which can be attached to an engineer's transit or other kind of theodolite, to permit the instrument's use as a solar compass.
valley crossing attachment
Earth science; Mapping science
An attachment to the telescope of a leveling instrument, consisting of a wedge shaped prism rotatable about an axis parallel to the optical axis of the telescope and deflecting ...
angular aperture
Earth science; Mapping science
The angle subtended, at an object point on the optical axis, by the radius of the entrance pupil.
azimuth traverse
Earth science; Mapping science
A survey traverse in which the direction of a measured course is determined by azimuth and verified by taking a back azimuth. To make this kind of traverse, an initial meridian ...
true air speed
Earth science; Mapping science
The speed of an aircraft relative to the air around it.
beam splitter
Earth science; Mapping science
A device or optical element that converts a single beam of electromagnetic radiation into two or more beams going in different directions. In the optical and near-optical region ...
alluvium
Earth science; Mapping science
The solid material (sand, silt, gravel, or other material) deposited by running water. It may accumulate to form land (the process, and sometimes the result, being referred to ...
Sub-categories
- Geology (10953)
- Mapping science (105290)
- Oceanography (12332)
- Physical oceanography (42660)
- Remote sensing (8661)
- Seismology (14406)
- Soil science (29216)