- Отрасли: Earth science
- Number of terms: 93452
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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, ...
(1) Control established specifically for use in a cadastral survey. (2) Lines established, and marked on the ground by survey monuments that are used as starting and closing points in surveys of the public domain of the United States of America. The fundamental cadastral control of the public land surveys of the USA consists of base lines, standard parallels (correction lines), principal meridians and guide meridians.
Industry:Earth science
A price, right, or benefit recognized by the law as sufficient to form a binding contract.
Industry:Earth science
Sketchiong relief onto a map as seen in perspective but controlled by locations on the map that correspond to salient points on the ground.
Industry:Earth science
A corner which has a location that can be identified by verifying the evidence of the monument, or its accessories, by referring to the description contained in field notes, or by an acceptable record of a supplemental survey, some physical evidence, or testimony as to where the point can be located. Even though its physical evidence may have disappeared entirely, a corner will not be regarded as lost if its position can be recovered through the testimony of one or more witnesses who have a dependable knowledge of the original location.
Industry:Earth science
The tidal constituent which represents the effect of the rotation of the Earth (with respect to the Sun) on the tides. Its period is 12. 00 hours and its angular speed is 30. 0000 degrees per hour. Its symbol is S2; the Doodson number is 273. 555.
Industry:Earth science
The quantity added to a difference of elevation to correct for the error introduced when level surfaces at different elevations are not parallel. Also referred to as the orthometric leveling correction.
Industry:Earth science
A geodetic coordinate system with origin at the Earth's center of mass.
Industry:Earth science
Any one of the six independent quantities f, g, G (related to precession and nutation), and h, H, i (related to annual aberration) in the two equations for rotation of the coordinate system from right ascension α<sub>o</sub> and declination δ<sub>o</sub> at mean equinox at time t <sub>o</sub>, to right ascension α and declination δ at equinox of date at time t <sub>o</sub> + Δt: α = α<sub>o</sub> + μα<sub>o</sub> + f+ g sin(G+α<sub>o</sub>) tanδ</sub>o</sub> + h sin(H+α<sub>o</sub>) sec δ<sub>o</sub> + J tan²δ<sub>o</sub>; δ = δ<sub>o</sub> + g cos(G+α<sub>o</sub>) + h cos(H+α<sub>o</sub>) sin δ<sub>o</sub> + i cos δ<sub>o</sub> + J'tan δ<sub>o</sub>. μα and μδ are the proper motions in right ascension and declination, respectively. The quantities f, g, G, h, H, i are given by <br>
Industry:Earth science
A coordinate in a curvilinear coordinate system. Symbolism for curvilinear coordinates generally varies with the particular system in question. e.g., (x, y, z) is commonly used for Cartesian coordinates, (r, θ, φ) for spherical coordinates, etc. If curvilinear coordinates in general are being used, common symbols are (q<sub>1</sub>, q<sub>2</sub>, q<sub>3</sub>) or, on a surface, (u, v).
Industry:Earth science
A line joining points, on the bed of the sea or other body of water, situated at equal vertical distances beneath the surface. Also known as a depth contour or isobath. It is different from a submerged contour. Although the definition merely specifies surface of the water, it can be inferred that an average surface such as mean sea level or the geoid is meant.
Industry:Earth science
