- 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, ...
An aerial camera which, in addition to photographing the ground, also photographs the horizon and the differential barometer (statoscope).
Industry:Earth science
Photogrammetry in which the size and shape of an object are determined mathematically from measurements made directly on the images, rather than mechanically from measurements on the stereoscopic model.
Industry:Earth science
A ranking, according to accuracy, of one measurement or survey with respect to other measurements or surveys. Accuracy is greatest in the first order, less in the second order, and so on. Each order of accuracy is expressed in numerical terms, or such terms are to be understood as being present.
Industry:Earth science
Any graphic material such as aerial photographs, photomaps, etc., produced or used as a substitute for a map. Map substitutes are usually produced when maps cannot be produced in time.
Industry:Earth science
A datum identical with the horizontal control datum for which the name United States Standard Datum was adopted in 1901; that name was later changed to North American Datum. Before 1901, this datum was defined by the following coordinates of the origin and azimuth (clockwise from South) in the Clarke spheroid of 1866; the origin was triangulation station Principio:<br>
Industry:Earth science
(1) A perturbation of the orbit of a body in the Solar System, caused by the attraction of the Moon and the Sun. (2) A perturbation of the orbit of a satellite of the Earth, caused by the attractions of the Sun and Moon. The most important perturbations are secular variations in the mean anomaly, in the right ascension of the ascending node, and in the argument of perigee. All other orbital elements except the length of the semi-major axis undergo changes having a long period.
Industry:Earth science
The angular coordinates of a celestial body referred to a coordinate system having its origin at the observer.
Industry:Earth science
Boundary. The term is archaic and is now found chiefly in the plural, in the term metes and bounds (q.v.).
Industry:Earth science
(1) Placing panels at a ground point to make it easier to find and identify the station on aerial photo-graphs. (2) Cutting a photograph, or a map containing some distortion, into several pieces and then cementing the pieces onto a gridded, stable material in such a way that the error is distributed in small amounts throughout the region depicted.
Industry:Earth science
