- 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, ...
The ratio of the effective aperture of a lens system to its focal length.
Industry:Earth science
(1) A narrow, dedicated street.
(2) A way through the middle of a block and giving access to the rear of properties. This is the more common usage.
Industry:Earth science
An azimuthal map projection, approximately the arithmetic average of the stereographic and azimuthal equal area map projections. Airy's map projection was intended to minimize the overall error of scale in the map. It is not, as is often supposed, a perspective map projection.
Industry:Earth science
The uncorrected reading of pressure caused by the speed of the aircraft through the air, expressed in terms of the speed needed to achieve that pressure in a standard atmosphere at sea level.
Industry:Earth science
The figure formed by three lines intersecting at a common point, and those portions of the planes included between these lines.
Industry:Earth science
1) The process of depicting land lines on a map to indicate the lines' location with respect to adjacent terrain and culture, using the information shown on plats and field records of the Bureau of Land Management with evidence, on the ground, of the locations of the lines to determine the location on the map. (BLM) (2) The process of depicting land lines of the public lands on a topographic map to indicate the true, theoretical or approximate locations relative to the adjacent terrain and culture.
Industry:Earth science
The arbitrary level from which vertical displacement is measured.
Industry:Earth science
The difference between the direction of a radiating source as it would be seen by a stationary observer at a specified point, and the direction in which the source is actually seen by a moving observer at that point. In the case of an observer on the Earth, stellar aberration has three principal components: diurnal aberration, resulting from the diurnal rotation of the Earth; annual aberration, resulting from the annual motion of the Earth about the Sun; and secular aberration, resulting from the motion of the Solar System's center of mass.
Industry:Earth science
That barometer, in the single base method of barometric altimeter, which is left at the point of known elevation.
Industry:Earth science
