- 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, ...
Mapping which uses photographs as the primary source of data and relies on photogrammetry to prepare maps from these data.
Industry:Earth science
A part of a spherical surface, bounded by halves of great circles and including the bounding semicircles.
Industry:Earth science
(1) Land held in common, as by a community. The term is now often used to mean a park, as Boston Common. (2) The right (arising either from a grant or contract, or from prescription or operation of a statue) of taking a profit in the land of another, in common either with the owner or with other persons.
Industry:Earth science
(1) A plane rectangular grid placed on maps drawn on the transverse Mercator map projection. This was originally a military grid. (2) An informal designation for a State plane coordinate system or a State coordinate system based on a transverse Mercator map projection.
Industry:Earth science
A mounting permitting the device or instrument attached to it to be rotated either in azimuth or in angular elevation. Also written alt-azimuth mounting. A theodolite incorporates an alt azimuth mounting for the telescope. The mounting has graduated circles which indicate the amount of rotation in either direction. Some astronomical telescopes are supported by alt-azimuth mountings. In that case, the telescope's motion is controlled by eye and hand if the telescope is small or automatically by a computer if the telescope is large.
Industry:Earth science
A system of four radio transmitters operating at four different frequencies between 1.650 and 1.700 MHz, forming two families of hyperbolas (iso-phase lines) along each of which the difference of phase of the signals from a pair of stations is a constant. A receiver's location can be determined by measuring the differences of phase in signals from the two pairs of stations and plotting the location at the intersection of a pair of hyperbolas. A plotting accuracy of 1 meter is attainable. The accuracy with which a location can be determined depends on many factors such as the location of the receiver within the pattern of iso-phase lines.
Industry:Earth science
A map of a region within the limits of the United States of America. The term applies, more generally, to a map of a region within the limits of that country whose maps are under discussion.
Industry:Earth science
Public lands that have been classified as containing or being known to contain valuable minerals.
Industry:Earth science
A low, ridge-like moraine carried on or deposited at or near the side of a glacier.
Industry:Earth science
