- 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, ...
Leveling in which only the reading at the line of sight through the central line of the three horizontal lines on the reticle is taken. For precise work, readings are taken along the line of sight through all three horizontal lines and the average of the three readings taken. The center wire method is faster than the three wire method but does not provide as many checks of the readings.
Industry:Earth science
The apparent daily path of a celestial body, approximating a parallel of declination.
Industry:Earth science
When unpolarized light incident on the flat surface of a transparent substance is most polarized in a plane upon reflection, the tangent of the angle of incidence is equal to the index of refraction of the substance. The reflected and refracted rays are just 90<sup>o</sup> apart.
Industry:Earth science
(1) The assembling of pages of publications, in sequence. (2) The verification of the order, number and date of maps.
Industry:Earth science
To bring the optical elements of an optical system into proper relationship with each other.
Industry:Earth science
A natural or artificial waterway which either periodically or continuously contains moving water or which forms a connecting link between two bodies of water.
Industry:Earth science
(1) A special purpose map showing the distribution of one of the magnetic elements such as local deviation of magnetic north from geodetic north. (2) A special purpose map showing the distribution of the secular change in one of the magnetic elements.
Industry:Earth science
A bench mark close to a tide station to which the zero of the tide gage and tidal datum were originally referred.
Industry:Earth science
A graphical representation of the errors, in the y-direction, of horizontal coordinates, with the errors plotted as ordinates against the y coordinates as abscissae.
Industry:Earth science
