- 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, ...
The number by which the numerical value or a quantity in one system of units must be multiplied to arrive at the numerical value in another system of units. e.g., The conversion factor for converting measurements in feet to the equivalent values in yards is 1/3. These measurements are in different units but are in the same system. The conversion factor for converting from feet to meters is 12/39. 37; these units are in different systems.
Industry:Earth science
A determination of mean sea level that has been adopted as a datum for elevations.
Industry:Earth science
A method of determining details of the terrain in a topographic survey carried out together with a traverse. Cross profile stations are established at 100 meter intervals along the line of the traverse, and profiles run at right angles to that line, distances and differential elevations being measured to successive breaks in the terrain along the profile.
Industry:Earth science
The depth, in the oceans, at which there is no horizontal motion of the water. The depth of the layer of no motion.
Industry:Earth science
A set of aerial photographs of a region, providing stereoscopic views of the entire region.
Industry:Earth science
A line joining points of equal elevation on the bed of a lake or reservoir where the elevation is related to a datum used for mapping adjacent land. This is not the same as a bathymetric contour.
Industry:Earth science
A tidal current occurring semimonthly as a result of the Moon's being over the equator.
Industry:Earth science
A datum containing exactly all the constants needed for specifying the coordinate system used. By definition, all geodetic datums (in sense (1)) are complete datums. However, the term datum is sometimes applied to sets of constants insufficient to specify the coordinate system. Then usually certain constants are assumed but are not specified. e.g., one or more of the constants specifying the orientation of the coordinate system are often omitted if a conventional orientation can be inferred.
Industry:Earth science
A cadaster specifying the boundaries of a region by the coordinates of points on these boundaries.
Industry:Earth science
