- 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, ...
Any one of several tests for determining whether two stations in a survey net can see each other.
Industry:Earth science
An instrument which measures a physical quantity in absolute units by means of simple physical measurements.
Industry:Earth science
Manipulation of the point-dependent density of an image to bring out or emphasize certain features of the image.
Industry:Earth science
A Julian day number calculated using days 86 400 ephemeris-seconds long.
Industry:Earth science
Geodetic coordinates on the first ellipsoid are converted to rectangular coordinates using some suitable map projection (e.g., transverse Mercator or State Plane coordinates). These are then converted back into geodetic coordinates using the constants for the second ellipsoid. Distortions introduced by this method are proportional to the distortions of the map projection used for calculating the coordinates.
Industry:Earth science
A unit of length equal to 0.9144 meter. The International Yard was adopted in 1959 by the U.S. Bureau of Standards and certain other national standards laboratories as a unit of length for scientific purposes only.
Industry:Earth science
A placing side by side. In surveying, the term refers often to the placing of figures which, in a description, have differing units: e.g., thence easterly along the north line of Lot 21, 211 feet can easily be interpreted to mean 21,211 feet instead of Lot 21 a distance of 211 feet. Inserting a phrase such as thence easterly along the north line of Lot 21, a distance of 211 feet is better.
Industry:Earth science
A measure of the amount of information contained in a string of symbols (message). If a message consists of a sequence of symbols x <sub>i</sub> (i goes from 1 to some number I), and if the a priori probability that x <sub>i</sub> will occur in the sequence is p <sub>i</sub>, then the information content of x <sub>i</sub>, i.e., the contribution of x <sub>i</sub> to the information in the sequence is commonly defined to be ln(1/p <sub>i</sub>)
Industry:Earth science
An alphabetical list of geographic names keyed to a map series or to maps covering a specific country, giving the designations of features, geographic and grid coordinates, and sheet number for each name appearing in the series. It is almost the same as a gazetteer, but has been established by international agreement.
Industry:Earth science
The equation M = E - e sin E, relating the mean anomaly M of a satellite to the eccentric anomaly E and the eccentricity e of the orbit. The equation is usually solved for E by an iterative method or by expressing E as an infinite series in M. Similar equations for motion in parabolic and hyperbolic orbits are sometimes also called Kepler's equations.
Industry:Earth science
