- Branche: Earth science
- Number of terms: 93452
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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, ...
(1) In Spanish law, a portion of land which was formerly given to a simple soldier on the conquest of a country. (2) A quantity of land of different size in different provinces of Spain, deriving from the quantity of land given a simple soldier on the conquest of a country. (3) In the Spanish possessions in America, a quantity of land 50 feet long in front and 100 feet deep.
Industry:Earth science
The horizontal-control datum which is defined by the following coordinates of the origin and by the azimuth (clockwise from South) to triangulation station Salud on the Clarke spheroid of 1866; the origin is at triangulation station Balboa Hill:<br>
Industry:Earth science
A navigation system consisting of two different and independent navigation systems combined in such a manner that the combination gives better results than either system separately would give. A combination of a Doppler and an inertial navigation system, or a combination of Loran-C and a Doppler navigation-system, are examples.
Industry:Earth science
A coordinate system, in space, consisting of a reference plane and two points in that plane. The bipolar coordinates of the point of interest are the dihedral angle between the reference plane and the plane through the three points, and the two angles between the line connecting the two points of reference and the two lines from those points to the point of interest.
Industry:Earth science
A simple pendulum subjected to no forces other than gravity and the tension in the connecting rod.
Industry:Earth science
The condition that exists when a survey carried out according to the descriptions of two separate pieces of property indicates that the properties overlap, while the descriptors had intended that the properties be contiguous. The condition occurs when descriptions by metes and bounds of the two parcels are described from two directions. For example: beginning at the northwest corner of the Southeast Quarter of said Section, thence southerly along the west line of said Southeast Quarter a distance of 1300 feet; thence easterly and beginning at the southwest corner of the Southeast Quarter of said Section; thence northerly along the west line of said Southeast Quarter a distance of 1340 feet; thence easterly will lead to an overlap.
Industry:Earth science
A photograph that by itself encompasses a panorama of the scene, as distinguished from a set of photographs which, pieced together, encompass a panorama.
Industry:Earth science
A device, to be attached to a telescope or microscope, consisting of a hairlike filament (hair, segment of spider-web or wire) connected to a screw so that as the screw is turned, the filament is translated across the field of view and in the focal plane of the telescope or microscope. The screw has a finely-cut thread and the amount of rotation is indicated by graduations on the head of the screw or by other means. The screws used in micrometers for geodetic instruments are graduated in angular measure (seconds, on American instruments). Turning the screw moves the filament a distance corresponding to the angle, at the instrument, between the two positions of the filament. Any small angle can be measured by noting the whole and fractional number of turns of the screw made in moving the filament from one position to the other and multiplying this by the angular value of one turn.
Industry:Earth science
A numbered grid made by dividing the graticule of a Mercator map projection between 90<sup>o</sup> north and 90<sup>o</sup> south (or between 80<sup>o</sup> north and 80<sup>o</sup> south) into quadrangles (Marsden squares), each extending 10<sup>o</sup> in latitude and 10<sup>o</sup> in longitude. The quadrangles are numbered systematically to indicate their location in the graticule. (The quadrangles may be divided further into quarters or into one degree quadrangles numbered from 00 to 99). The Marsden chart commonly shows, in each quadrangle, a number indicating some average characteristic of the ocean or atmosphere in the region covered by that quadrangle. For example, a Marsden chart of sea state shows, in each quadrangle, the average or other characteristic height of the waves in the corresponding region.
Industry:Earth science
Separated everywhere by the same distance. The term is used, in particular, in respect of lines and surfaces.
Industry:Earth science
