- 行业: Earth science
- Number of terms: 93452
- Number of blossaries: 0
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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 angle, in a triangle, opposite a side used as a base in the solution of the triangulation equations, or a side whose length is to be computed. In a chain of single triangles, two sides in each triangle are used as the computation proceeds through the chain: a known side and a side to be determined. The angles opposite these sides are the distance angles.
Industry:Earth science
The change in scale, in an image, in a direction tangent to a circle about the optical axis (i.e., perpendicular to the radial direction).
Industry:Earth science
El cambio de escala, en una imagen, en una dirección tangente a un círculo alrededor del eje óptico (i. E., perpendicular a la dirección radial).
Industry:Earth science
The difference between the numerical values of two measurements over the same section of a level line. Divergence and partial are practically synonymous.
Industry:Earth science
The angle between the line of sight toward the Moon and the line of sight toward another celestial body, as measured by an observer on the Earth. It was formerly used in determining longitude at sea.
Industry:Earth science
The length of the shortest arc of the great circle joining two points. It is usually expressed in nautical miles.
Industry:Earth science
The displacement of images of object points from their expected positions in perspective, caused by the cylindrical shape of the negative and the scanning action of the lens in a panoramic camera.
Industry:Earth science
The difference between two values of the same quantity when only one value of that quantity is expected. In particular, (a) a difference between results of duplicate or comparable measures of a quantity; (b) a difference in computed values of a quantity; or (c) a difference in computed values of a quantity obtained by different processes using data from the same survey. Examples are: the difference in the length of two measures of the same line; or the amount by which the values of the location of the third point of a triangle, as computed from the other two points, may fail to agree when the values have not been corrected for misclosure. Discrepancy is closely associated with but is not identical with misclosure.
Industry:Earth science
The difference between a measured value of gravity and the vertical gradient of the disturbing potential.
Industry:Earth science
A function giving the number of times, or proportional number of times, a set of random variables takes on a value lying within a specified interval conventionally, an interval having no lower limit (i.e., having a lower limit of -∞ . ) Alternatively, the total frequency with which a value equal to or less than a specified value of a random variable has occurred. It is also called a distrib-ution function, density function, cumulative frequency function, cumulative probability function and probability function. It is abbreviated as c. D. F. The term distribution function is preferred by many statisticians who consider cumulative distribution function a pleonasm. Unfortunately, distribution function now has several meanings, making the term ambiguous at best and vague at worst. Probability function is also ambiguous. Cumulative distribution function, on the other hand, has only one meaning at present and is therefore to be preferred where clarity is desired. Density function is most often used as a synonym for frequency function and its occurrence with the meaning of cumulative distribution function must be regarded as an aberration.
Industry:Earth science
