- 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, ...
That line, in a grid on a map, which represents the central meridian.
Industry:Earth science
Intangible rights arising out of real or personal property. E.g., the right to light and air.
Industry:Earth science
A circular instrument of the slid-rule type, used to calculate elevations from vertical angles and horizontal distances. It is commonly used in plane-table surveys.
Industry:Earth science
A new guide meridian established for purposes of control where the original guide meridians were placed farther apart than 24 miles. Auxiliary guide meridians may be needed to limit errors of old surveys or to control new surveys. They are established by surveying in the same way as are regular guide meridians. They may be assigned a local name, such as Grass Valley Guide Meridian or Twelfth Auxiliary Guide Meridian West.
Industry:Earth science
The average elevation above sea level of the terrain included in a set of aerial photographs.
Industry:Earth science
A stretch of water partly enclosed and so protected from storms as to allow vessels to load, unload, refuel, repair, etc., in safety.
Industry:Earth science
Sodium hyposulfite, a common fixing agent used in developing and printing photographs. The term is jargon but is in common use.
Industry:Earth science
A change in gravity at a point fixed with respect to a geocentric coordinate system.
Industry:Earth science
(1) The value of gravity obtained by adding, to a hypothetical value of gravity at a point Q on a reference surface, the amount by which gravity would change in going from Q to a point P a vertical distance H<sub>p</sub> above Q, if gravity varied between the two points according to the inverse square law. Also (rarely) called Bouguer gravity. (2) The value of gravity obtained by subtracting, from a measured value of gravity at a point P on the Earth's surface, the amount by which gravity would change in going from P to a point Q a distance H<sub>p</sub> vertically below P on the geoid, if gravity varied between the two points according to the inverse square law. Also (rarely) called Bouguer gravity. In either of the above definitions, the point Q is assumed to lie on the surface of a ball with a radius equal to the average radius R<sub>o</sub> of the Earth and on which the value of gravity is the average value g<sub>m</sub> of gravity over the surface of the Earth. The rate of change of gravity between P and Q is then
Industry:Earth science
