- 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, ...
A map such that the sums of squares of errors in scale in mutually perpendicular directions and integrated throughout the map, is minimal for a given type of map projection.
Industry:Earth science
That number, in a set of numbers, which occurs most frequently. If two or more numbers occur with equal frequency, the mode does not exist.
Industry:Earth science
A map projection, from the ellipsoid to the plane, such that exact scale is maintained along that closed curve on the plane which corresponds to a given, closed curve on the ellipsoid.
Industry:Earth science
That part of a beach between the shoreline and the line at which the waves break.
Industry:Earth science
A magnetometer determining the intensity of the Earth's magnetic field by measuring the field's effect on a saturable-core reactor or on a pair of oppositely wound, saturable-core reactors. The reactor is driven through saturation by a low frequency (about 1000 Hz) oscillator and the second harmonic or the sum of all even harmonics of the generated EMF of the reactor is measured. Such a magnetometer has a sensitivity of about 10<sup>-5</sup> oersted. Fluxgate magnetometers are simple, inexpensive, and sturdy and have been much used in aeromagnetic surveys.
Industry:Earth science
(1) A traverse of the margin of a body of water. (2) The line followed in meandering. Meander lines are not surveyed as boundary lines but are surveyed to determine the sinuosities of the bank or shore line and the quantity of land not under water. Practice of the U.S. Bureau of Land Management is to meander only permanent, natural bodies of water. (3) A metes-and-bounds traverse made approximately along the mean high water line of a permanent, natural body of water. By following the sinuosities of the bank or shoreline, the meander line allows one to compute the area of land remaining after the area covered by water has been segregated. A meander line (2) differs from lines established by other kinds of metes-and-bounds surveys in that it ordinarily does not determine or fix boundaries.
Industry:Earth science
A line, in a geomagnetic coordinate system, having an approximately north and south direction at the equator. Not to be confused with a magnetic meridian.
Industry:Earth science
A corner, established at a suitable point on the meander line of a lake lying entirely within a quarter section or on the meander line of an island falling entirely within a section, which is found to be too small to subdivide. A line is run connecting the corner to a regular corner on the section's boundary line.
Industry:Earth science
A geodetic datum based on the Mercury ellipsoid 1960 and located with respect to a number of major datums of the world by a large, given set of constants. It was used principally by the USA in computing orbits and trajectories from observations made at tracking stations on that datum, in particular, those tracking stations used in Project Mercury. It has also been used as the datum for locating OMEGA, LORAN-C and LORAN-A stations.
Industry:Earth science
