- 行业: 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 contour on the surface of the lowermost rock-complex or basic metamorphic and volcanic rocks underlying a region.
Industry:Earth science
Checking the accuracy of or calibrating a depth sounder by suspending a bar or disk at various measured distances beneath the sound generator and measuring the depths independently with the depth sounder.
Industry:Earth science
Accuracy as determined by reference to a value that must be specified.
Industry:Earth science
The adjustment of the angles and lengths of sides, in a single chain of triangles, so that the sums of the angles in each triangle equals 180° and, in the case of a quadrilateral, that the sum of the angles equal 360°.
Industry:Earth science
The photographic density of the material supporting a photographic emulsion.
Industry:Earth science
(1) That energy which is scattered from a surface on which energy is incident and which lies within a hemisphere having its center on the surface and including the source of the radiation. (2) That part of the energy incident on a surface which is neither transmitted nor reflected. The term may or may not include energy absorbed at the surface and re-radiated.
Industry:Earth science
That value of atmospheric pressure to which the scale of a barometric altimeter is set.
Industry:Earth science
The theorem that if an event B is known to have occurred as the result of some one event in a set (A<sub>k</sub>), then the probability that it was the particular event A<sub>j</sub> that caused B is given by P(A<sub>j</sub> B) = P(B A<sub>j</sub>) P(A<sub>j</sub>)/ <font face = symbol>S</font>k(P(A<sub>k</sub>) P(B A<sub>k</sub>)), where A<sub>j</sub> is from a set of J members. The numerator is the product of the probability of event A<sub>j</sub>, regardless of whether B occurred or not, times the probability that B would have occurred if A<sub>j</sub. did. The denominator is the sum of the products of the probability of each event A<sub>k</sub> times the probability that B would have occurred if that A<sub>j</sub> had. If all the conditions of the theorem are fulfilled, the theorem is certainly correct. The difficulties in applying the theorem, however, are caused by insufficient knowledge of the a priori probabilities. The theorem has gained considerable notoriety through its misuse, e.g., by mistaking prior data for a priori knowledge.
Industry:Earth science
