- 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, ...
A structure made to float on the surface of the water or at a predetermined depth below the surface, and to carry instruments or serve as an aid to navigation. Buoys used as aids to navigation are moored to the bottom; those made to carry instruments may be moored or free to move.
Industry:Earth science
The equation Cl = r<sub>R</sub> + g<sub>G</sub> + b<sub>B</sub>, which characterizes a color Cl of luminosity l by matching it against a mixture of r units of color R (red), g units of color G (green) and b units of color B (blue).
Industry:Earth science
A high, sharp-edged pass in a mountain ridge. It is usually produced by the headward erosion of opposing cirques.
Industry:Earth science
An assemblage of two cameras mounted so as to have a fixed angle between their optical axes, and taking pictures simultaneously. The angular coverage is greater than that obtainable by a single camera of the given type - usually along the axis of the aircraft carrying the assemblage.
Industry:Earth science
The angle from the vertical through the compensator in a self leveling instrument to the line normal to the reflecting surface of the compensator's moving part.
Industry:Earth science
The problem of finding all practical operations for determining the inclination of a transit's horizontal axis of rotation as a function of the observed zenithal distance, taking the irregularity and inequality of the pivots into account.
Industry:Earth science
The process of changing the values of a set of quantities so that the predicted values of a function of the set shall differ less, in absolute value, from the corresponding observed values of the function than for any other set.
Industry:Earth science
A wye type leveling instrument having a level attached under the telescope. The invention of this instrument contributed in part to making the spirit-level type of leveling instrument popular.
Industry:Earth science
Time determined by reference to the indications of a chronometer. i.e., clock time for which a chronometer is used.
Industry:Earth science
A body which rotates about an axis within the body. Not to be confused with a revolving body, which moves about an axis outside the body. The theory of rotating bodies is quite extensive because it is fundamental to an understanding of the Earth's figure and internal structure.
Industry:Earth science
