- 行业: 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, ...
The range of frequencies required to transmit information at a specified rate.
Industry:Earth science
A continuous and distinctive shading, tone, or repetitive pattern used on a map to cover a part representing a region where a particular phenomenon occurs, or to which a particular value is assigned.
Industry:Earth science
The individual who takes the information pertaining to a title in its full form and puts all facts into an abbreviated form. The abbreviated form is alled an abstract or abstract of title.
Industry:Earth science
(1) Ascertain or set the measure or limits of. (2) Measure. (3) Determine the proper share of, or the proper apportionment of e.g., to admeasure common of pastrue.
Industry:Earth science
The bottom line of a graticule, at right angles to the line representing the central meridian and along which the distances to other meridian representing lines are established.
Industry:Earth science
A branch (of a river) which, after diverging, rejoins the river farther down. The term is used, in particular, for a secondary channel, in a broad plain of braided channels, that maintains a semi permanent course. Examples occur in eastern Australia, the jungles of South America, in the southern Sudan, and elsewhere. See, e.g., billabong.
Industry:Earth science
Side looking radar operating at decimeter wavelengths and measuring the angle at which the radiation is emitted and returned. Most side looking radar operates at millimeter wavelengths. Such radiation is scattered by vegetation and does not reach the ground if the vegetation is dense, and the radar sees only the top of a densely forested region. Radar operating at decimeter wavelengths is able to see through the vegetation to the ground.
Industry:Earth science
The rate of change of velocity with respect to time, measured with respect to axes fixed in space.
Industry:Earth science
Navigation in which the prescribed course is a circular arc and the vessel or aircraft is kept on this course by reference to radio signals from a transmitter at the center of the arc.
Industry:Earth science
(1) The F layer in the ionosphere. It occurs in the general region between 150 and 300km above the ground. (2) The F<sub>2</sub>-layer in the ionosphere. It occurs at about 300km above the ground.
Industry:Earth science
