- 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, ...
An equal area map projection of the sphere into an ellipse and defined by.
Industry:Earth science
A bench mark connected to the surface of reference by continuous first order leveling.
Industry:Earth science
An eyepiece containing a prism for use with a collimator.
Industry:Earth science
Calculation in which each quantity used is represented by a single number (e.g., 395. 28 and 10110. 1) and the calculation is done according to the usual rules of arithmetic. In fixed point calculations, the decimal point is not moved. Contrasted with floating point calculation, in which each quantity is represented by two numbers and the decimal point is moved so that it immediately precedes or follows the most significant digit.
Industry:Earth science
(1) An optical device which projects a virtual image onto a flat surface and used for sketching the image or comparing that image with another. (2) A monocular instrument using a half silvered mirror (or its equivalent) to superpose the image of an object onto a flat surface. Called, incorrectly, a camera obscura.
Industry:Earth science
A camera designed specifically for recording images directly on radiation sensitive emulsion. A photographic camera consists of four subassemblies, usually distinct and often separable: the lens assembly, consisting of the lens system and the lens; one or lens cylinder which keeps the lens system in place; the shutter mechanism, which determines the total amount of light admitted to the camera for taking a picture; the magazine, which stores, moves, and positions the light sensitive material on which the images are recorded; and the body, which holds the other three subassemblies in place and also keeps out all light but that admitted by the shutter mechanism.
Industry:Earth science
A building located on a lot and used for a purpose other than that of the principal building on the same lot.
Industry:Earth science
Frequent, random movements caused by the randomly spaced impacts of sub microscopic particles (atoms, molecules, or elementary particles) in the fluid surrounding a more massive and visible body. The motion is most noticeable when the body a small, suspended particle such as a mote of dust in the air. Brownian motion is a particular case of the motion called random walk. It is one factor limiting the accuracy achievable with some kinds of measuring instrument such as accelerometers. It should not be confused with the motion caused by random motions of the molecules in the body itself.
Industry:Earth science
(1) A circular roadway having only one point of access to the adjoining street. (2) A circular road terminating other roads or streets and into which or from which traffic flows to those roads or streets.
Industry:Earth science
