- 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, ...
That code with which a computer works directly. Machine language is usually numerical in nature.
Industry:Earth science
A term added to the Vening Meinesz equations (for the deflection of the vertical) to correct for the effect of condensing topographic masses onto the reference surface.
Industry:Earth science
An ellipsoid coinciding, at the equator, poles and 45<sup>o</sup> latitude, with a theoretical surface of constant gravity-potential. In general, not all these conditions will be satisfied. A niveau-ellipsoid will exist, therefore, only for a limited class of theoretical surfaces.
Industry:Earth science
A hypothetical layer of water, on the Earth, having a thickness such that the ratio of its area to its volume is equal to the ratio between the surficial area of all the world's oceans to the volume of all those oceans.
Industry:Earth science
The potential attributable to the action of a force field in which the force of attraction or repulsion is inversely proportional to the square of the distance from the source of the force.
Industry:Earth science
A plat (at an approximate scale of thirty chains to one inch; 1980 feet to one inch) of the new-status records, on which is shown survey data necessary to identify and describe public-domain lands and on which is indicated those actions and transactions which currently limit or restrict the use of public lands and resources.
Industry:Earth science
(1) A mounting, for an instrument, whose orientation with respect to a non-rotating coordinate-system is held fixed. There is no precise definition of a non rotating coordinate-system in the physical sense. Such a system has been defined as one that is not rotating with respect to the average positions of the distant galaxies. However, the definition is frequently weakened by applying the term to any coordinate system with respect to which other coordinate systems are considered to be rotating. Orientation is usually fixed by coupling the support to two or more gyroscopes whose axes are mutually perpendicular. (2) A support, for an instrument, whose orientation with respect to a non-rotating coordinate-system is known.
Industry:Earth science
The distance at which the angle (annual parallax) subtended by the average radius of the Earth's orbit is 1". Equivalently, the distance at which one astronomical unit subtends an angle of 1". It is approximately 3.26 light years or 30.9 x 10 <sup>12</sup> kilometers.
Industry:Earth science
