- Industry: Earth science
- Number of terms: 93452
- Number of blossaries: 0
- Company Profile:
Founded in 1941, the American Congress on Surveying and Mapping (ACSM) is an international association representing the interests of professionals in surveying, mapping and communicating spatial data relating to the Earth's surface. Today, ACSM's members include more than 7,000 surveyors, ...
A current paralleling the shore and occurring largely within the surf zone. It is caused by the excessive water brought to the zone by the small, net transport of water by wind waves. Longshore currents feed into rip currents.
Industry:Earth science
A contour line whose thickness varies to give the effect of a shadow thrown by oblique illumination on a plate having the thickness of the contour interval. Incorrectly called a shadowed contour.
Industry:Earth science
A horizontal plane defined at a particular, arbitrary distance below a tide-gage bench mark and from which tidal heights at a tide gage are, in theory, measured. In the period between successive levelings to a tide gage bench mark, the plane is established at the tide-gage by reference to the contact mark.
Industry:Earth science
A coordinate related to the center of the Moon; i.e., a coordinate in a selenocentric coordinate system.
Industry:Earth science
The number of degrees of angular measure, at the center of a circle, subtended by an arc 100 feet in length. In early surveys of highways and railroads, a 100 foot chord has been used instead of a 100 foot arc in defining degree of curve.
Industry:Earth science
A transparent sheet on which corrections to the underlying drawing or map are noted.
Industry:Earth science
An instrument for determining the depth of the water. In particular, an echo sounder.
Industry:Earth science
A curve whose parametric equations are real analytic functions of the same real variable.
Industry:Earth science
