- Industry: 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 angle ε such that a pair of coordinates x and y can be found, on an ellipse with major diameter 2a and minor diameter 2b, satisfying the equations cosε = x/a and sinε = y/b.
Industry:Earth science
A straight line through a figure bisecting all straight lines drawn perpendicular to it and terminating on the figure. i.e., a straight line with respect to which a geometric figure is symmetrical.
Industry:Earth science
A plat carrying a compilation of all descriptions of land within a given region, showing controlling measurements and other data. Not all dimensions in a deed are shown; those that are a controlling consideration are emphasized.
Industry:Earth science
A figure eight shaped diagram showing the declination of the Sun throughout the year and also the difference between true solar and mean solar time (the equation of time). It may be shown on a plane or curved surface, such as that of an analemmatic sundial, but is most commonly shown drawn across the torrid zone on a terrestrial globe.
Industry:Earth science
A diagram designed for orienting a planetable by means of the Sun's shadow.
Industry:Earth science
The interchange of instrument with target, sub tense bar, etc. , on a tripod in such a manner that centering over the marker is maintained automatically.
Industry:Earth science
Aerotriangulation in which coordinates of ground points are derived from measured coordinates of image points using mathematical functions rather than a physical model to represent the relationship between image point and object point.
Industry:Earth science
Testing, by sampling, whether or not a map complies with specified standards of accuracy. It checks both relative and absolute accuracies of distances, lengths, and elevations shown on the map. COMPARE WITH accuracy checking.
Industry:Earth science
(1) A black and white reproduction, as of a map, plan, or photograph, on transparent film in positive form and made directly from a positive.
(2) A material which gives a positive copy from a positive transparency (or a negative from a negative transparency) by direct development. Also termed a direct copy or direct positive.
Industry:Earth science
(1) The air in the immediate vicinity of a surveying instrument or surveying station. The temperature and pressure of this air are referred to as the ambient temperature and the ambient pressure. (2) That part of the air which affects a geodetic measurement. This usage is rare and inappropriate.
Industry:Earth science
