- 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, ...
A line, on a grid, passing through the origin and perpendicular to the line representing the prime meridian.
Industry:Earth science
A (railroad) yard in which cars are moved (sorted) by locomotive, with material aid from gravity.
Industry:Earth science
That circle, on the celestial sphere, formed by the intersection of the celestial sphere with the plane tangent to the geoid at the plumb line through the point of observation.
Industry:Earth science
An imaginary line, in the plane of a photograph, representing the image of the celestial horizon; it corresponds to the intersection of the plane of a photo-graph and the horizontal plane containing the perspective center or rear nodal point of the lens.
Industry:Earth science
(1) A well-defined, naturally elevated region of land smaller than a mountain. (2) A rounded elevation of land of comparatively medium height (between 100 to 500 feet (30 to 150 meters) above surrounding, flat land.
Industry:Earth science
Relating to the relative humidity or comparative amount of moisture in the atmosphere. Because the atmosphere penetrates bodies in varying degrees depending on the substances of which they are composed, the amount of moisture in the air will affect the shapes and dimensions of certain instruments and equipment used in surveying and mapping. Therefore, materials to be used in making leveling rods, plane table sheets, maps, etc., must be selected which are not sensitive to hygrometric conditions.
Industry:Earth science
A structure, generally consisting of tight, sheetlike piling of creosoted timber, steel or concrete, braced with wales and with round, very long piles, and extending out from the shore in such a way as to prevent of check erosion of the shore by currents or waves.
Industry:Earth science
(1) A person who makes surveys of bodies of water. (2) In some sections of the United States of America, a person who measures the flow of water in streams or conduits.
Industry:Earth science
A set of values of gravity (usually, gravity acceleration) referred to the value of gravity, at one or more places, defined or taken as standard. Three gravity systems have been adopted internationally. These are the Vienna gravity system (1900 to 1909), the Potsdam gravity system (1909 - 1971), and the International Gravity Standardization Net 1971
Industry:Earth science
