- Branche: 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 sum of the (vectorial) momentum of a particle relative to the Earth and the momentum of the particle caused by the Earth's rotation.
Industry:Earth science
The dihedral angle between two planes passing through the least axis of the ellipsoid. The angle is taken counterclockwise, as viewed from the north, from one plane used as reference to the other plane associated in a specified manner with the point in question. Also referred to as longitude if the meaning is clear. The planes used in the definition are usually selected in one of two ways. (a) The reference plane is required to contain a specified point on the ellipsoid; the other plane contains the point of interest. (b) The reference plane is parallel to the normal at a specified point on the ellipsoid; the other plane is parallel to the normal at the point of interest. If the ellipsoid is rotationally symmetric, these two ways are equivalent, and geocentric longitude becomes the same as geodetic longitude.
Industry:Earth science
A map made by a title company, assessor, or other person or organization for its own convenience in locating property in a region in which all the descriptions are by metes and bounds. On the map, the individual pieces of land (lots) are given arbitrary numbers. The deeds and other documents affecting these pieces of land are placed in what is called an arbitrary account.
Industry:Earth science
(1) A procedure for restoring a lost corner by reference to two known corners (both east and west or north and south of the lost corner) and an alinement in the transverse direction, by using the rule that the measured distance from a known corner to the restored corner shall have the same ratio to the corresponding, recorded distance (to the original corner) as the total, measured distance between known corners has to the distance given in the original record, and that the alinement be preserved. (2) A method of proportioning measurements, in the restoration of a lost corner whose location is determined with respect to alinement in one direction, by distributing the excess or deficiency in such a way that the amount given to each interval shall have the same proportion to the whole difference as the recorded length of the interval bears to the whole distance.
Industry:Earth science
Proper motion, as measured in seconds of arc per year, reduced to absolute proper motion in kilometers per second of time. Reduced proper motion can be calculated only if the distance or parallax of the star is known.
Industry:Earth science
A map projection with the property that the two distances of any point on the map from two fixed points are true to scale. It was first described by C. Close in 1921.
Industry:Earth science
A vector characteristic of a rotating or revolving mass, equal in magnitude to mrv cos θ, in which m is the mass of the body, r the distance from the origin to the body and v the speed of the body. θ is the angle between the line from the origin to the body and the axis about which the body is rotating or revolving. This definition applies, properly, only to bodies which are point masses. For a real body, the above quantity must be integrated over all elemental masses making up the body.
Industry:Earth science
Any map containing information collected from various sources other than surveys made for the particular purpose of constructing the map. Most small scale maps of large areas are compiled maps.
Industry:Earth science
A method of determining the tilt of an aerial photograph by using three or more ground points whose horizontal and vertical coordinates are known, and another point of known horizontal coordinates whose image is near the center of the photograph.
Industry:Earth science
