- 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 set of three formulae for the longitude λ, latitude φ and back azimuth A of the normal section (to P<sub>o</sub>) at a point P on a rotational ellipsoid, given the longitude λ<sub>o</sub> and latitude φ<sub>o</sub> of an initial point P<sub>o</sub> and the distance s and forward azimuth A<sub>o</sub> (of the normal section) of P from P<sub>o</sub>, as derived by A. R. Clarke (1880). The formulae are correct to about 1 part in 106 at 150 kilometers if 7 significant figures are used in the computations. The useful distance can be increased to about 750 km by using one of several modifications of Clarke's formula by, e.g., Rainsford (the Clarke Rainsford formula).
Industry:Earth science
An agent who executes orders to buy or sell securities on behalf of a client in exchange for a commission.
Industry:Earth science
A sextant in which the bubble of a spirit level serves as the horizon. A simple form of bubble sextant was designed by E. E. Byrd and used by him for aerial navigation, on expeditions to the North and South Poles and on other arctic and antarctic expeditions. It has a spirit level with a circular bubble attached to the sextant quite close to the horizon glass. The angular elevation of a celestial body is measured by bringing its image into contact with the image of the bubble as seen in the horizon glass.
Industry:Earth science
An optical instrument containing or consisting of a device (compensator) for keeping a line of sight or line of collimation level even though the optical axis of the instrument may not be level.
Industry:Earth science
(1) A road which in its earlier existence was obscure or local to neighborhood and not used to any great extent by the public, yet so far a public road that the public has the right of access to it at all times. (2) The statue law of New Jersey recognizes three kinds of roads: the public road, the private road, and the byroad. A byroad is a road used by the inhabitants and recognized by statute but not laid out. Such roads are often called driftways. They are roads of necessity in newly-settled countries.
Industry:Earth science
(1) An offer by an intending purchaser to pay a designated price for property which is about to be sold at auction. (2) An offer to perform a contract for work and labor or to supply materials at a specified price.
Industry:Earth science
A large, rounded rock which has been separated from the mass of which it was originally a part. Deeply imbedded boulders may show an exposed surface which, through weathering, has the appearance of bedrock.
Industry:Earth science
A set of symbols with two binary operations denoted as (logical) addition and (logical) multiplication, such that for all symbols A, B, C in the set the following rules apply.
Industry:Earth science
A map showing the distribution of selected meteorological elements over a large region at a specified instant of time. It is approximately the same as a weather map.
Industry:Earth science
A telescope so mounted that its collimation axis may be made to coincide with the vertical (or direction of the plumb line). The vertical collimator serves as an optical plumb line. It may be designed for use in placing a mark on the ground directly under an instrument on a high tower or for use in centering an instrument on a high tower directly over a mark on the ground.
Industry:Earth science
