- 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, ...
An equatorial mounting in which the two bearings for the polar axis are situated one so far above the declination axis and the other so far below it that the telescope rotates in a meridian between them. The polar axis may be thought of as splitting in half lengthwise and spreading the halves apart to accommodate the telescope and declination axis between them.
Industry:Earth science
A predetermined value added to an angular deviation, meridional or ex-meridional, to determine latitude.
Industry:Earth science
(1) A pocket-sized instrument registering the number of steps or paces taken by the pedestrian carrying it. Formerly called a pedometer. The passometer is housed in a case resembling that of a watch and is attached in an upright position to the body or to a leg. The distance walked is obtained by multiplying the number of steps or paces taken by the length of the wearer's step or pace.
Industry:Earth science
That intensely bright portion of the Sun which is visible to the naked eye.
Industry:Earth science
The area of a circle having a diameter of 0.001 inch. This is approximately equal to 7.85 x 10 <sub>-7</sub> square inch.
Industry:Earth science
A system of representing numbers as a power series in the base 2, using only the digits 0 and 1 as coefficients; the coefficients are written down in order of descending powers of 2. Neither the base nor the exponent is written down.
Industry:Earth science
The climate in the layer (about 2 meters thick) of air next to the ground. The microclimate undergoes large variations in temperature and humidity.
Industry:Earth science
Климат в слое воздуха (около 2 метров) рядом с землей. Микроклимат претерпевает большие колебания температуры и влажности.
Industry:Earth science
(1) The algebraic difference of the distances of two images of a point from the respective photograph nadirs, measured in a horizontal plane and parallel to the air base. (2) The same as the preceding definition except that the distances are measured in the plane of the photograph and in the direction of flight. The term is often shortened to parallax. Other names are absolute parallax, horizontal parallax, linear parallax, stereoscopic parallax and x-parallax. Usually, absolute stereoscopic parallax is used, to denote similar measurements made when the ideal conditions of truly vertical photographs are not attained, as, for example, when measuring parallax on unrectified aerial photographs.
Industry:Earth science
The representation of physical effects, in a dynamic physical system, in terms of admittedly over-simplified equations containing arbitrary constants, rather than representing them by equations in which the constants have physical meaning and are theoretical consequences of the system's dynamics. Use of such techniques is dictated by lack of adequate knowledge of the physics of the system and often is a matter of mathematical convenience. The validity of the representation must be judged by the faithful-ness of the representation to measurements on the system.
Industry:Earth science
