- 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, ...
A grid and a system of referring to points on the grid such that locations can be referred to or directions and distances between points on the grid calculated accurately and consistently. Approximately equivalent to a grid system (q.v.)
Industry:Earth science
A watch with a device for stopping the motion of the balance, so that the time may be set precisely.
Industry:Earth science
(1) A map showing the planimetric configurations of a highway and its connections, at grade or by controlled access, to other highways. (2) A map showing the details of curvature, roadside and cross-drainage, right-of-way boundaries and delineations regarding adjacent occupancy and land uses. The amount and kind of detail shown in a highway map depends entirely on the scale of the map and the purpose of the map, whether merely for indicating traffic routes or for depicting details of construction.
Industry:Earth science
The root mean square value Δg <sub>rms</sub> of gravity anomalies Δg <sub>n</sub> over the entire Earth: Δg <sub>rms</sub> ≡ + √ ( (Σ Δg<sub>n</sub>²) / N), in which n goes from 1 to N, the total number of gravity anomalies.
Industry:Earth science
(1) At a given point, the difference between the geoidal height there and the geoidal height at another point used as reference. (2) The geoidal height above an ellipsoid of reference having its center at some point other than the Earth's center of mass.
Industry:Earth science
An improved version of Shoran, emitting a sharper pulse with more carefully controlled amplitude. Phase is also measured more accurately in the receiver. Also written HIRAN and hiran. Other characteristics of Hiran are much the same as those of Shoran. Hiran (high precision Shoran) was developed principally for geodetic use after the spectacular success of Shoran. The standard deviation of a measurement by Hiran is approximately 0.36 √K meters, in which K is the measured distance in kilometers. Among the major geodetic projects completed using Hiran were the connection of Crete to Africa and Rhodes in 1953, and the connection of North American Datum 1927 to European Datum from Canada to Norway and Scotland by way of Greenland and Iceland in 1953-1956
Industry:Earth science
An aerial camera designed for photo-graphing the horizon at the same time as another camera photographs the ground. The pictures taken by the horizon camera show how far the other camera is off the vertical.
Industry:Earth science
The distance between two points as obtained by computation from the plane rectangular coordinates of the points. In the State Plane Coordinate Systems, a grid length differs from a geodetic length by the amount of a correction based on the scale factor for the given line.
Industry:Earth science
A gravity apparatus in which the distance moved by the object is determined by measuring the change in the number of wavelengths in the path of a beam of coherent radiation shining on the object.
Industry:Earth science
