- Industri: 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, ...
In Spanish law, common property: those things which, not being the private property of any person, are open to the use of all, such as rain, water, the sea and its beaches.
Industry:Earth science
In a camera having several lens systems, or in an assemblage of several cameras, the values of the angles between the optical axes of the several lens systems or cameras and a common reference line. For example, in a trimetrogon camera, the angles between the optical axes of the oblique cameras with respect to the optical axis of the central (vertical) camera.
Industry:Earth science
An inversor consisting of a long rod pivoted a fixed distance below the plane of the lens system's perspective center and having sliding sleeves, on the upper and lower arms, through which pass rods rigidly connected to the planes of negative photograph and easel.
Industry:Earth science
A panoramic camera in which the lens system swings or rotates about the rear nodal point at a given rate.
Industry:Earth science
(1) A special case of the method of least squares, in which the set of unknowns is divided into two subsets with different weights.
Industry:Earth science
A shutter shaped like a filled in figure 8 and rotating about a pivot through the waist of the figure in such a way that light passing through the system can be interrupted by one or the other of the two branches. The shutter is located between the elements of the camera's lens system.
Industry:Earth science
The formulae for the standard deviation s of a set of N numbers and the standard deviation s<sub>a</sub> of the average: s = √ ( Σ v²/(N 1)) and s<sub>a</sub> = √ ( Σ v²/(N 1)N). The v's are deviations from the average.
Industry:Earth science
(1) The value to be added to or subtracted from the reading of an instrument to obtain the correct reading. (2) The correction, to the nominal length between two graduations on a surveyor's tape, needed to account for the difference (calibrated minus nominal) between the nominal length and the length found by calibration. When the graduations mark the full length of the tape, the calibration correction and the length correction have the same value.
Industry:Earth science
(1) An approximation (Boussinesq 1903), to the exact equations of motion of water, which neglects, in the inertial term, variations in the density of water. (2) An approximation (Boussinesq 1903), to the exact equations of motion of a fluid, which assumes that the fluid is incompressible except insofar as thermal expansion produces buoyancy.
Industry:Earth science
