- 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, ...
That component, of the difference between the location of a satellite's location as computed from theory and the location estimated from observations by the method of least squares, which is perpendicular to the direction of the satellite's velocity at a particular instant and perpendicular to the osculating plane at that instant.
Industry:Earth science
A fan consisting of silt and other fine material deposited by a stream or river at its mouth or where the slope of the bed abruptly becomes less.
Industry:Earth science
The amount by which the sum of the three angles of a spheroidal triangle exceeds 180<sup>o</sup>. In geodesy, spherical angles are used instead of spheroidal angles; the difference between the two kinds of angles is quite small even for the largest triangles and is considered negligible for ordinary triangulation.
Industry:Earth science
A horizontal-control datum having its origin at the point D783t on the northern tower of the Frauenkirche, in Münich, with the same coordinates as those of the European Datum 1950, and on the International ellipsoid.
Industry:Earth science
(1) That point at which the celestial equator intersects the ecliptic and at which the Sun apparently passes from north to south. (2) That time at which the Sun apparently passes from north to south across the celestial equator. It occurs about 23 September.
Industry:Earth science
A penci-shaped piece of abrasive used in removing unwanted marks from a metallic pressplate.
Industry:Earth science
(1) Land used specifically for agriculture such as the raising of crops or livestock. It may consist of part or all of a single farm, or it may be made up of many contiguous farms. (2) Land designated, by zoning laws or ordinances, for agricultural use.
Industry:Earth science
Distance - measuring equipment which measures the difference between the time at which a pulse of sound was emitted and the time at which the echo is received, and converts this to a distance. This type of equipment is used primarily for determining depths, in which case it is known as echo sounding equipment or for determining underwater distances to vessels such as submarines. It has not found a geodetic application so far, although it has been proposed to use the Sofar channel to determine intercontinental distances.
Industry:Earth science
A systematic error, occurring in observations made with a repeating theodolite, caused by strains set up by the clamping devices of the instrument.
Industry:Earth science
