- 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, ...
The vertical angle between the horizontal axis of an astronomical or surveying instrument and the plane of the horizon. Inclination of the horizontal axis is measured with a striding level or a hanging level. It causes the line of collimation of a theodolite or transit to describe an inclined plane instead of a vertical plane when the telescope is rotated about the horizontal axis of the instrument. This produces an error in a measured horizontal angle and requires that a correction for inclination of the horizontal axis be applied.
Industry:Earth science
Land granted to a railroad in lieu of place lands when the place lands had already been granted else-where for other purposes.
Industry:Earth science
The approximate, average water level determined from all lower low waters at spring tides.
Industry:Earth science
(1) The difference in elevation between the two high waters or the two low waters of each day. (2) The difference in speed between the two tidal flood currents or the two tidal ebb currents of each day. The difference changes with the declination of the Moon and, to a lesser extent, with the declination of the Sun. In general, the inequality increases with an increasing declination, either north or south, and decreases as the declination decreases. The National Ocean Service specifies that the periods of observation for the diurnal inequalities be certain 19-year long intervals called National Tide Datum Epochs.
Industry:Earth science
Estimation of intrinsic value for comparison with market price to determine whether or not to invest.
Industry:Earth science
Hydrostatic equilibrium in a fluid body is impossible if the density varies on level surfaces.
Industry:Earth science
Isostasy existing over an extended region because of isostatic compensation over that region.
Industry:Earth science
(1) The process of making maps from photographs. (2) The process of constructing a plan and elevation of an object from a perspective view of that object.
Industry:Earth science
(1) A channel or bed of a river. (2) A river or stream. This Dutch term is found used in this sense in descriptions of land in old conveyances.
Industry:Earth science
An object or point (unoccupied station) whose horizontal coordinates are determined by measurements from other survey stations, no measurements being made at the object or point itself. If the object is observed from only two stations, the location is called a no-check position, because there is no proof that the measurements were free from blunders. Intersection stations either are at places which it would be difficult to occupy with an instrument, or are survey signals whose locations can be determined with sufficient accuracy without having to occupy the station.
Industry:Earth science
